Rehearsal talks for the 2022 APS April Meeting
US
We encourage ATLAS researchers, especially postdoc, graduate and undergraduate students from US universities, to give a presentation on their research during the APS 2022 "April" meeting from April 9-12. The US ATLAS speakers committee will review a draft of your abstract and check for overlaps with other speakers. We will also coordinate your practice talk before the meeting. Each of you needs to upload a video about your contribution by Mar 24 (https://april.aps.org/virtual).
In order to catch this deadline, there is a list of critical milestone to catch:
- Mar 17: upload the 1st draft video/slide or poster to this agenda page for the US ATLAS review.
- Mar 21: upload the revised draft video/slide or poster to the Physics Office review page (https://indico.cern.ch/event/1140613/), after addressing US ATLAS review comments.
- Mar 24: upload final version to APS (https://april.aps.org/virtual), after addressing PO comments.
The US ATLAS continue strong participations to the APS April meeting. There are 48 contributions from US ATLAS this year: 1 plenary, 41 oral talks, 6 posters.
-
-
BSM IConveners: Joseph Ira Kroll (University of Pennsylvania (US)), Shih-Chieh Hsu (University of Washington Seattle (US))
-
1
Search for Dark Matter Produced in Association with a Dark Higgs Boson Decaying to two b-quarks Using full Run-2 data set from the ATLAS detector
A hypothetical dark Higgs boson was proposed in a dark matter (DM) model to explain the origin of mass in dark sector as well as to open up new annihilation channel relaxing the DM relic density constraint from cosmological observation. The search focusing on Majorana DM produced with a low mass dark Higgs boson decaying to two b-quarks is proposed and working in progress using the 139fb-1 of proton-proton collision data collected with ATLAS detector at √s=13 TeV.
The event selection and categorization are optimized based on the varying dark Higgs mass. Advanced jet clustering and boosted tagging techniques are applied to achieve higher efficiency and better signal over background ratio.
The analysis method and model interpretation strategy together with the result of expected sensitivity will be presented.Speaker: Qibin Liu (Tsung-Dao Lee Institute, Shanghai Jiao Tong Univ. (CN) & Univ. of Washington Seattle (US))Hsu:
Thanks for the nice draft presentation. In general, the contents and structure reads good. It's a choice of style. I think it's a little bit too many words. Many statements can be saved in presentation instead of writing.
p2. The key message of searching for s(bb) is not highlighted
First search of s(VV) for high mass is done, and this is a dedicated search in s(bb) for low mass should be emphasized. I would save a few other descriptions of the model. Instead, highlight the important feature of this analysisp5 Defines resolved vs merged, but p4 claim resolved vs boosted. It's better to unify the notation.
p6 method -> methods
p7 If I were you, I'll replace all the figures with one performance plots which show the mass-agnostic performance
p8 I think this is too much detail for such a short talk. This can be in the backup slide
p9 95% -> 95% C.L.
p9 If I were you, I'll show one figure of the mono-SVV results, and then show this new mono-Sbb results. These two figures will show complementary of two searches.
p10. It will be nice to add one bullet to highlight how relic density enters the consideration
p11
preliminary result -> preliminary results
blinded result -> blinded results
-
2
Search for Dark Matter produced in association with a Higgs boson decaying to a pair of b quarks and combination of Dark Matter search with 2HDM+$a$ with the ATLAS detector
Dark Matter (DM) searches are of great importantance to the LHC program. In this talk, I will first present a DM search using the Higgs boson as a portal. This search targets events that contain large missing transverse momentum and either two $b$-tagged small-radius jets or a single large-radius jet associated with two $b$-tagged sub-jets. No significant excess with respect to the SM prediction is observed. The results are then interpreted to set limits on two benchmark models with a second Higgs doublet and an additional heavy vector boson (2HDM+$Z^{ʹ}$) or a pseudoscalar singlet (2HDM+$a$), both of which provide a viable DM candidate. I will focus on how events are selected and categorized to enhance sensitivity to DM signals, and to help model the major backgrounds. Finally, I will also talk about the latest summary and combination of the searches for DM within the 2HDM+$a$ model.
Speaker: Jay Chan (University of Wisconsin Madison (US))Hsu:
The talk reads in a very good shape.
For my curiosity, is this event display containing two muons?
Can it be interpreted as boosted bb events with soft muon decay?I have a few comments to some slides:
The page number is always "15" from page 1 to page 9.p2/p6 Add "bar" to anti-particles in the Feynman diagram
p7 There are many plots. I would suggest to move these plots to backup slide, and only select two plots to illustrate each one of the CR regions. You have a focus to illustrate how good the modeling is.
P10 There are many results. It's nice. You might consider to break one slide to three.
Take home message can be illustrated and highlighted to each individual slide.
You will spend the same amount of time on presentations but make the points even more clear.
p11 I think the last sentence is not necessary - more data/new technologies are always coming.
You can draw all attentions to nice results in your talk.
* Emphasize what are "new" and more than just add more data in this talk.
* Emphasize what the "first" or the "best" results presented in this talk?
This will make the summary slide more outstanding.--------------
Thanks Shih-Chieh! I have adjusted my slides accordingly.
To your question, your understanding is correct. The event contains a boosted Higgs->bb with soft muon decays.
-
3
Search for dark mesons decaying to top and bottom quarks in 139 fb-1 of proton-proton collision data at √s = 13 TeV with the ATLAS detector at the LHC.
Extending the Standard Model (SM) with a new strongly coupled dark sector can generate models with both an experimentally accessible dark meson production mechanism and a viable dark matter candidate particle. A search for dark mesons is presented in an integrated luminosity of 139 $\mathrm{fb^{-1}}$ of proton-proton collision data at a center of mass energy of 13 TeV with the ATLAS detector at the Large Hadron Collider (LHC). In this model, dark pions are pair-produced and then decay to top-antitop or top-antibottom quark pairs. This talk describes the strategy and expected sensitivity of the all-hadronic channel of this search, with a signature of six or more jets and no additional missing transverse energy. Exclusion limits from this analysis are expected to provide new dedicated constraints on dark meson parameter space, exceeding existing limits derived from the reinterpretation of prior analyses.
Speaker: Galen Gledhill (University of Oregon (US))Hsu:
Thanks for the nice draft. It generally reads nice. I just have a few questions on some slides. Look forward to some clarifications in the slide to address my questions.
p2 Since you mentioned reinterpretation, do you want to show how the results are, or attach them to the backup slide?
p6 It's nice to see study of different radius. Is there a concluding statement about the logic behind choosing R=1.2?
p10 Why do you only test VR K-N? What happen to VR L-M?
p10 Is it OK to show data?p11 Is 60% the size of systematic uncertainty?
Is there quantitative argument to support the claim of stronger sensitivity than re-interpretation?
If not, I would suggest to rephrase that quantitative comparison to the improvement against re-interpretation is work in progress.
-
4
Search for Heavy (pseudo)Higgs boson A/H produced in association with a top-antitop quark pair leading to the final state with four top quarks in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector
Four top-quark production, a rare process in the Standard Model (SM) with a cross-section around 12 fb, is one of the heaviest final states produced at the LHC, and it is naturally sensitive to physics beyond the Standard Model (BSM). A data excess is observed with twice of the expectation. A follow-up analysis is the search for Heavy (pseudo)Higgs boson A/H produced in association with a top-antitop quark pair leading to the final state with four top quarks. The data analyzed correspond to an integrated luminosity of 139 fb^-1. In this talk, the four top-quark decay final states containing either a pair of same-sign leptons or multi-lepton (SSML) are considered. To enhance the search sensitivity, a mass-parameterized BDT is introduced to discriminate the BSM signal against the irreducible SM four-top and other dominant SM backgrounds. Expected upper bounds on the production cross-section of A/H are derived in the mass range from 400 GeV to 1000 GeV.
Speaker: Meng-Ju Tsai (University of Michigan)Hsu:
Congratulations for the nice slide. The style is very good. I just have a few suggestions in some slides.
p3. There are several ATLAS jargons could be avoided (e.g. GRL, PV, ECIDS, DL1r, ...). Not all technical details required to be listed for public talk.
Some critical items should be clarified, perhaps even another slide with some cartons. e.g. SS,
p5. Another abbreviations should be defined before introduction in this slide, e.g. CR, SR
p6. Is HT part of the input to SM BDT? It's nice to clarify this, and add a backup slide to explain what variables enter BDT.
What is the motivation of bkg reweighting training, and benefit of doing so?p7. Another slide with several un-defined terms, HF, Conv. B-only, ...
For this short term, you don't have to list all details. I would suggest to pick one of them and explain a bit more details, but just claim dedicated CR methods are developed and control other samples.p9. you can choose to move this to backup slide if you run out of time.
-
5
Search for neutral long-lived particles decaying into displaced jets in the ATLAS calorimeter
New long-lived particles are a feature of many extensions to the Standard Model and may elude searches for promptly decaying particles. An analysis of data collected in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector at the Large Hadron Collider is described, focusing on identifying signatures of jets produced by long-lived particles decaying to Standard Model fermions within the ATLAS calorimeter system. The analysis considers benchmark hidden sector models of neutral long-lived scalars with masses between 5 GeV and 475 GeV produced by decays of heavy mediators with masses between 60 GeV and 1000 GeV. Models of stealth supersymmetry, Higgs-portal baryogenesis, and dark photons are also considered. The results of this analysis are presented using the full Run 2 (2015-2018) data set, corresponding to an integrated luminosity of 139 fb$^{-1}$.
Speaker: Mason Proffitt (University of Washington (US))Hsu:
Congratulations for the paper submission! It's great to see nice presentations to this analysis using several novel ML at jet level, and analysis level.
If possible, a big take away of this talk would be to quantify how much improvement of search sensitivity or systematic deduction, or MC/data agreement thanks to ML techniques, in comparison to the previous version of analysis.Here are a few slide by slide comments:
p3 Cosmic ray background was mentioned once here, but seems disappear in the rest of talk. How relevant is it? Nice to mention it.
p6 It's good to briefly describe jet clustering algorithm and radius.
Definition of "Control Region" per jet. Normally, CR is defined as event level. It's interesting that you have a per-jet definition in a CR
Is the MC in the CR = multi-jet + BIB + Cosmic ray?
p9/p10 Sum dR_min is a critical variable in this analysis. It will be nice to define it in a cartoon earlierp11 Here is a good place to clarify how much improvement coming from ML in addition to luminosity gain (more data)
p14 Backup
One nature questions that audiences would like to know is what variables go into BDT, and how good MC/data agreement of those input variable.
The other question is whether you have sufficient statistics of events in MC and Data for the per-jet NN adversarial training. -
6
Search for the pair production of vector-like quarks in the Wq+X fianl state with the full Run 2 ATLAS dataset
Vector-like quarks (VLQ) are predicted in many extensions to the
Standard Model (SM) as their vector-like nature allows them to extend
the SM while still being compatible with electroweak sector
measurements. Pair production of VLQ provides a model-independent
method of searching due to the QCD production of the particles. While
most searches have focused on VLQs that decay to an SM boson and a
third-generation quark, decays to light quarks have been largely
overlooked. This talk presents the expected results of a search for pair production of vector-like down quarks that decay into a leptonically decaying SM W
boson and a light quark, with the other VLQ decaying to a hadronically
decay boson and a light quark. The analysis uses boosted
boson identification and data-driven correction of the dominant W+jets
background prediction to improve sensitivity. Further, this analysis
extends the sensitivity of previous analysis done in Run 1 by increasing
the collision energy and the statistics by including the full Run 2
ATLAS dataset with an integrated luminosity of 139 $fb^{-1}$.Speaker: Evan Richard Van De Wall (Oklahoma State University (US))Hsu:
The draft reads nice.
I would suggest to add a strategy description about the background estimate strategy. e.g. Normalization of top and W+jet through control region scaling (if that's the case)..., etc.
Here are a few slide by slide comments:
p2 Higgs boson -> the Higgs mechanism
SM -> Standard Model (SM)
p4 Nice place to add theory reference paper with hyperlinksp5 qq' -> q\bar{q}'
p7 to p9 are you allowed to show data?
p7 the data/MC comparison doesn't look so great.
p11 How is the fake estimate implemented? Is it isolation cut? It will be nice to briefly define the method and provide references.
p12 It's good to define the definition of m^lep_{VLQ}.p15 It will be more impressive by highlighting improvement since previous analysis.
-
1
-
BSM IIConveners: John Stupak (University of Oklahoma (US)), Walter Lampl (University of Arizona (US))
-
7
Search for Generic Heavy Higgs Boson Using 13 TeV pp Collision Data at ATLAS
A search for a fermi-phobic heavy Higgs boson via the $pp \rightarrow W^{\pm}H \rightarrow W^{\pm}W^{\pm}W^{\mp}$ process with 139 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}=13~\text{TeV}$ collected by the ATLAS detector is presented.
The heavy Higgs boson has potential dimension-6 effects in an effective field theory context, which can cause significant kinematic deviations from those predicted within the Standard Model. Events with two same-sign leptons ($e$ or $\mu$) in association with one large-R jet or two small-R jets with an invariant mass consistent with a hadronically decaying $W$-boson are analyzed to test for the presence of effects from new physics.Speaker: Yue Xu (Tsinghua University (CN))Very nice presentation! I have just a few minor comments:
-s5: why do these plots have the ATLAS label. It looks like they have been approved, but then you added a WIP label. Are they approved or not?
-s5: Including ATLAS jargon like NtrkPt500PV is not helpful to folks outside ATLAS (or many inside ATLAS). If the details of the requirement are important, explain them in plain words
-s8: again, GHH300fW0fWW4600 is meaningless to your audienceGeneral comments:
-You should check with the relevant conveners to make sure it is okay to show your WIP plots (particularly those with data)Regards,
John
-
8
Search for Resonant and Non-Resonant VHH Production
Studies of Higgs boson pair production (hh) represent the next crucial step to constraining the Higgs sector and allow the chance to refine measurements of the Higgs boson self-coupling. While previous searches have focused on the hh production in the gluon-gluon fusion (ggF) and vector-boson fusion (VBF) modes, this analysis documents a new search, with 139 fb-1 of pp collisions at $\sqrt{s}$ = 13 TeV collected by the ATLAS detector in LHC Run 2, for di-Higgs production in the Vhh final-state. It searches for both resonant and non-resonant hh production, with only hh→$b\bar{b}b\bar{b}$ considered for simplicity, in association with a leptonically decaying vector boson (W or Z). While this process has a lower cross-section than ggF and VBF hh production, it offers a clean final state with relatively small backgrounds, due to the presence of leptons. The analysis benefits from small backgrounds and attempts to set limits for the first time on Vhh production. Analysis techniques and expected significance will be presented.
Speaker: Nicholas Graves Kyriacou (University of Michigan (US))Very nice presentation! I have just a few minor comments:
S2: you are too pessimistic. The goal should not be to set a limit, but instead to discover new physics. If you don't discover new physics, then setting a limit on new physics is the fallback
S4: you define little h and big H, but not the pseudoscalar A
s5: what is "statistical yield"?
s28: you are missing WIP label on plotsGeneral comments:
-You should check with the relevant conveners to make sure it is okay to show your WIP plots (particularly those with data)
-You talked a bit fast in order to finish in time. It would be better to remove some content and take your timeRegards,
John
-
7
-
B and TopConveners: John Stupak (University of Oklahoma (US)), Walter Lampl (University of Arizona (US))
-
9
Identification of additional b-jets in the $t\bar{t}$ plus heavy flavor production with two leptons of the opposite sign in the final state using BDT for differential cross- section measurements
Top quark pair-production in association with one or two additional $b$-jets is one of the main backgrounds in the search for $t\bar{t}+H$ production, and in BSM physics searches involving top and bottom quarks in the final states. Precise measurement of $t\bar{t}+b$ and $t\bar{t}+bb$ differential cross sections will help to significantly reduce systematic and modeling uncertainties in future BSM searches and measurements of the top-Higgs coupling. A BDT that discriminates between $b$-jets which do or do not originate from top quarks decays has been developed in the opposite-sign dilepton channel. The method has higher purity compared to the existing method based on the angular distributions between $b$-jets and leptons. Preliminary results show that with the new method we can accurately measure the $p_{T}$ spectra of $b$-jets from top quark decays and of the leading additional $b$-jet up to 400 GeV, and the sub-leading additional $b$-jets $p_{T}$ up to 300 GeV. The analysis uses LHC proton-proton collision data at the center-of-mass energy $\sqrt{s}=13$ TeV with an integrated luminosity of 139 fb$^{-1}$ collected with the ATLAS detector in 2015-2018.
Speaker: Egor Antipov (Oklahoma State University (US))Very nice presentation! I have just a few minor comments:
-S5/6: what selection is applied here? (Egor: added)
-backup: plots should also have WIP label (Egor: fixed)General comments:
-Units should not be italicized (Egor: fixed)
-You should check with the relevant conveners to make sure it is okay to show your WIP plots (particularly those with data) (Egor: waiting for feedback from the conveners; in principle, sharing the plots at APS don't violate the ATLAS rules)Regards,
JohnNice presentation, just a few minor comments:
I think short text (bullet) on slide 5 and 6 would be useful to explain the plots (as you do orally). (Egor: added)
The plots in the backup slides are labelled "ATLAS Internal"! (Egor: fixed)- Walter
--------------------
Egor:
Many thanks for the review and comments!
Uploaded the updated slides in PDF and the video (both here and in the review agenda) -
10
Measurement of the $CP$-violating phase $\phi_s$ in $B_s^0\rightarrow J/\psi\phi$ decays in ATLAS at $13~\mathrm{TeV}$
A measurement of the $B_s^0\rightarrow J/\psi\phi$ decay parameters using $80~\mathrm{fb}^{-1}$ of integrated luminosity collected with the ATLAS detector from $13~\mathrm{TeV}$ proton-proton collisions at the LHC is presented. The measured parameters include the $\textit{CP}$-violating phase $\phi_s$, the width difference $\Delta\Gamma_s$ between the $B_s^0$ meson mass eigenstates and the average decay width $\Gamma_s$. The values measured for the physical parameters are combined with those from $19.2~\mathrm{fb}^{-1}$ of $7~\mathrm{TeV}$ and $8~\mathrm{TeV}$ data, leading to the following:
\begin{equation}
\phi_s=-0.087\pm0.036~(\mathrm{stat.})\pm0.021~(\mathrm{syst.})~\mathrm{rad}
\end{equation}
\begin{equation}
\Delta\Gamma_s=0.0657\pm0.0043~(\mathrm{stat.})\pm0.0037~(\mathrm{syst.})~\mathrm{ps}^{-1}
\end{equation}
\begin{equation}
\Gamma_s=0.6703\pm0.0014~(\mathrm{stat.})\pm0.0018~(\mathrm{syst.})~\mathrm{ps}^{-1}
\end{equation}
Results for $\phi_s$ and $\Delta\Gamma_s$ are also presented as $68\%$ confidence level contours in the $\phi_s-\Delta\Gamma_s$ plane. Furthermore, the transversity amplitudes and corresponding strong phases are measured. $\phi_s$ and $\Delta\Gamma_s$ measurements are in agreement with the Standard Model predictions.Speaker: Easwar Anand Narayanan (University of New Mexico (US))Very nice presentation! I have just a few minor comments:
s3/4/13: you went very quickly over the last plot on each slide. Too fast for me to comprehend. If it is worth showing the audience these plots, it is worth giving them time to digest. What is the takeaway from these plots?
s8: there is a lot of text here. Can this be reduced somehow?Regards,
JohnNice presentation, just one minor comments:
The "two solutions" mentionned on slide 12 only explained in the backups slides. At least point to the backup slide.
- Walter
-
11
Studies of C-jet spectra in various Flavor Schemes for $t\bar{t}+c$ cross section measurement
A comparison of three flavor scheme, four flavor scheme and five flavor scheme has been performed using top quark pair-production with additional charm jet $(t\bar{t}+c)$ events simulated by MadGraph and showered by Pythia8. Spectra of additional c-jets that do not originate from the top quark decay are compared in the three schemes. These studies are motivated by the upcoming $t\bar{t}+c$ jets cross section measurement. No significant differences in spectra of additional c-jets are observed in the different flavor schemes.
Speaker: Calvin Ainsworth (Oklahoma State University (US))Very nice presentation! I have just a few minor comments:
S4/5: it is not clear what these plots are. If it's worth including these plots, it's worth explaining them. At a bare minimum, the axes should be labelled.
S5: I would make the period in the last bullet red so it isn't overlooked
S7-9: axis labels are not readableGeneral comments:
-You should check with the relevant conveners to make sure it is okay to show your WIP plots (particularly those with data)Regards,
JohnNice presentation, just a few minor comments:
Slide 4: The red text on red backround is not readable, moreover there are no axis labels
Slide 5: Also no Axis labels!And plots containing only simulated data should be labelled as "Atlas Simulation"
- Walter
Thank you for the comments. I have gone in and made the changes.
Regards,
Calvin
-
9
-
HiggsConveners: Joseph Ira Kroll (University of Pennsylvania (US)), Shih-Chieh Hsu (University of Washington Seattle (US))
-
12
Search for Higgs Boson Pair Production in the Multi-lepton Final State Using Proton-Proton Collision Data at $\sqrt{s} =13$ TeV from the ATLAS Detector
This talk will present a search strategy for Higgs boson pair-production in final states with three electrons or muons. The analysis is performed using an integrated luminosity of 139 fb$^{-1}$ of $pp$ collision at $\sqrt{s}= 13$ TeV collected by the ATLAS detector at the LHC. There are many decay modes of Higgs boson pairs that have low branching ratios, and many of these are not covered by dedicated analyses. Some example modes of particular interest for a three lepton final state are WWWW, WW$\tau \tau$, $\tau \tau \tau \tau$, etc. This talk presents the development of a multivariate strategy (boosted decision trees) and current work on background estimation methods and statistical analysis.
Speaker: Santosh Parajuli (Southern Methodist University (US))Hsu:
Congratulations to nice slide. I just have a few comments:
p1 Add home institute in addition to LOGO :)
p3 Is the BR containing the leptonic decay branching ratio from W and Z boson?
It's nice to clarify.p4. It's nice to explicitly say that 3 and only 3 leptons
p5/p6 these two can be moved to backup slide
p9. I would add slides to explain definition of CR and difference from SR
At least, explanations about how most dominant bkg is controlled.
p10. can be moved to backup slide. With such a short time, you can save this as technical details in the backup slide.
p11. Use a few cartoons to explain the definition of observables will be useful
The novelty of this analysis is BDT part, is this after all Signal Region selection, or another Loose pre-selection ? It's good to describe strategy of this analysis in the very beginning of the talk.
p14. It's nice to comment on the expected timeline of this analysis.
-
13
Combination of searches for resonant and non-resonant Higgs boson pair production in the bbyy, bb𝜏𝜏 and bbbb decay channels using pp collisions at √s= 13 TeV with the ATLAS detectors = 13 TeV with the ATLAS detector
A combination of searches for Higgs boson pair production is performed using up to 139 fb$^{-1}$ of proton-proton collision data at a center-of-mass energy $\sqrt{s} = 13$ TeV recorded with the ATLAS detector at the LHC. The combination exploits three analyses searching for $HH$ decays to $bb\gamma\gamma$, $bb\tau\tau$ and $bbbb$. Results are interpreted in the context of non-resonant and resonant Higgs boson pair production scenarios. In the non-resonant interpretation, upper limits are set on the Higgs boson pair production cross-section and on the self-coupling modifier $\kappa_{\lambda}$. In the resonant interpretation, upper limits are set on the Higgs boson pair production cross-section as a function of the heavy resonance mass.
Speaker: Alkaid Cheng (University of Wisconsin Madison (US))Hsu:
Congratulations for nice slide. It's a very detailed and comprehensive talk, and polished very well.
I have a few questions to clarify understanding of your talks.p6. the improvement of bbtautau is explained as tauID improvment
What is the reason of bbgammagamma improvement?
p8. Is there an intuitive explanations about asymmetric log-L curve? In particular, why is there a dip at k_lambda =5 for no systematic black curve?
-
14
Measuring Diphoton Production in Association with Heavy Flavor with the ATLAS Detector
This unique analysis investigates the production of two photons in conjunction with heavy flavor quarks using the ATLAS detector at the Large Hadron Collider at CERN using the full Run 2 dataset with a center-of-mass energy of $\sqrt{s}= 13$ TeV. The $\gamma\gamma$ + heavy flavor jets process is a dominant background in at least two important analyses: the $HH\rightarrow\gamma\gamma bb$ process, which provides a direct probe of Electroweak Symmetry Breaking due to observation of the Higgs boson self-coupling and the $t\bar{t}H\rightarrow\gamma\gamma$ process, which is important for measuring the Yukawa coupling between the Higgs and top quark. Despite its importance, $\gamma\gamma$ + heavy flavor jets process has never generically been measured before, nor is there any direct prediction in literature. A template fit will be implemented to the jet flavor-tagging discriminant to extract the signal to measure the components of heavy flavor in $\gamma\gamma + jets$. The measurements will be made in the single-jet or multi-jet categories that are a combination of b-, c-, and light-flavor jets (bb, bc, bl, etc.). Preliminary sensitivity estimates will be shown.
Speaker: Brianna Stamas (Northern Illinois University (US))Hsu:
Congratulations for this very nice draft. I have some minor suggestions to your slide.p1. Just show speakers' name on behalf of the ATLAS
p3/p4. I would suggest to move this to backup slide. You can really just focus on the gamma gamma +HF analysis
I didn't suggest to add slides but some nature questions from the audiences will be what the pT spectrum of the detector, what the selection of the jets, what the b-tagging algorithms, and what the pT/eta dependence of the b-tagging, how will those dependence affect your measurements. Just keep these in mind and prepare some answers in case those questions show up.
I am very excited to see your future progress of this important measurements, in particular, in the future version of the APS. -
15
Combination of Searches for HH Production with ATLAS Run 2 Data
Searches for di-Higgs production are some of the most exciting new results at the LHC. This talk will present the latest ATLAS HH combination results with the full Run 2 dataset of 139/fb at $\sqrt{s}=13$ TeV. By combining results from three different complementary search channels, bbγγ, bbττ, and bbbb, the HH combination has high sensitivity in both non-resonant and resonant interpretations.
In the non-resonant interpretation, bbγγ and bbττ channels are combined to produce limits on the Standard Model (SM) HH production cross-section and the Higgs boson self-coupling. Although no evidence for a signal was observed, the observed (expected) upper limits on SM HH production cross-section at 95% confidence level are 91.44 fb (92.10 fb). The combination of both channels also provides strong observed (expected) limits on Higgs self-coupling modifier, $𝜅_{𝜆}$ , between $−1.0 ≤ 𝜅_{𝜆} ≤ 6.6$ ($−1.2 ≤ 𝜅_𝜆 ≤ 7.2$).
For the resonant interpretation, bbγγ, bbττ, and bbbb, are combined to search for a heavy scalar decaying into two Higgs bosons with masses between 251 GeV - 3 TeV. Upper limits on the observed (expected) production cross-section are set ranging between 1.1 and 595 fb (1.2 and 393 fb).
Speaker: Jannicke Pearkes (SLAC National Accelerator Laboratory (US)) -
16
Measurement of the Higgs boson production cross section using the H -> tau tau process in Run 2 ATLAS data
A measurement of the Higgs boson cross section using H -> tau tau decays is performed, with the result split into 4 production modes, with both hadronic and semi-hadronic decays considered. Data was taken by the ATLAS detector during Run 2 of CERN's Large Hadron Collider, with a center-of-mass energy of 13 TeV, resulting in 139 fb^{-1} of proton-proton collision data. Full unblinded results are shown. Special attention is paid to the associated top quark pair production mode, including a proposed differential cross section measurement of the transverse momentum of the Higgs boson using a neural network to improve the resolution.
Speaker: Marc Tost (University of Texas at Austin (US))Hsu:
Congratulations to prepare this nice draft. It's a fairy complicated analysis. The talk presented it very well. I just have a few questions to some of the slides.
p9 Is it possible to add a cartoon or a chart to visualize the definition of 9 signal regions?
In particular, there are 12 boxes which is different from the 9 signal region counting.I changed the slide to say 12, instead of 9. The truth is, there are 12 regions but some are combined for a total of 9 signal measurements. This is probably too nuanced to get into, so I will adjust the slides and address it only of it comes up during the talk.
p16 Can you show the data?
We are not comfortable showing the fits quite yet, the studies are too preliminary. The most I can say is that they have potential.
-
17
Measurement prospects for di-Higgs production in the HH->bbyy channel with the ATLAS experiment at the HL-LHC
We present a prospect study on di-Higgs production in the $HH \rightarrow b\bar{b}\gamma\gamma$ decay channel with the ATLAS experiment at the High Luminosity LHC (HL-LHC). The results are obtained by extrapolating the results from the Run 2 measurement, with 139 fb$^{-1}$ of data at a center-of-mass energy of 13 TeV, to the conditions expected at the HL-LHC. While there is no sign of di-Higgs production with the current LHC dataset, the much higher luminosity (3000 fb$^{-1}$) and energy (14 TeV) at the HL-LHC will enable a much better measurement of this important process. We describe in detail the extrapolation process and assumptions, and multiple scenarios for the treatment of systematic uncertainties at the HL-LHC are considered. Under the baseline systematic uncertainty scenario, the extrapolated precision on the Standard Model di-Higgs signal strength measurement is 50%, corresponding to a significance of 2.2$\sigma$. The extrapolated precision on a measurement of $\kappa_\lambda$, the trilinear Higgs boson self-coupling modifier, is [0.3, 1.9].
Speaker: Alex Zeng Wang (University of Wisconsin Madison (US))Hsu:
Congratulations to the nice draft slide. It's a talk with many details and has been polished quite well.
I have no further comments. Audiences might be interested in knowing how this new projection be different from the previous projection, and what differences are. In case you want to revise the slides, you might prepare this in the backup slide.
-
12
-
Instrumentation IConvener: Wade Cameron Fisher (Michigan State University (US))
-
18
Construction and Testing of the first 12 sMDT Chambers at University of Michigan for the ATLAS HL-LHC upgrade
The Large Hadron Collider (LHC) will be upgraded to increase its luminosity by a factor of 7.5 relative to the design luminosity. The ATLAS detector will undergo a major upgrade to fully explore the physics opportunities provided by the upgraded LHC. In order to optimize trigger efficiencies at the High-Luminosity LHC (HL-LHC), the Muon Spectrometer will be upgraded by replacing the MDT (Monitored Drift Tube) chambers by smaller-diameter MDT (sMDT) chambers and additional thin-gap RPC (Resistive Plate Chamber) trigger chambers in the barrel inner station. The University of Michigan ATLAS group is responsible for building 50% of the sMDT chambers. I will report on the construction and testing of the first 12 sMDT chambers built at the University of Michigan in 2021. Precision measurements and testing procedures will be described and the chamber precision and performance results will be presented.
Speaker: Neal Anderson (University of Michigan (US))This is a very nice presentation, so I will not have many suggestions for you. You spoke at a good pace, though I think you were a bit hurried on the last slide. I think practicing a few times should allow you to find exactly what you want to say on each slide so you can finish without hurrying.
Slide 3: you will say "BIS" many times in this talk, so you may want to also define that acronym.
Slide 5: you have bracketed numbers, which I think must be the tolerance goals, but you don't say anything about them. And if these are tolerances, it's interesting that the dark current tolerance is bound at 0 nA but the data are frequently below zero.
Slide 6: practice how you'll walk through the pictures. It was confusing which picture was left bottom and left middle, etc.
Slide 8: These plots are too small to read. If you don't plan on going into the details, perhaps it's better to show one set of figures but larger.
Slide 11: I couldn't figure out where to see the grounding foils. Also, with the y-axis label on the plot removed, it's hard to know what you're showing us.
Slide 14: Kevin Nelson's talk lists 15 chambers built at UM, while you say 18. You two should be consistent.
Please feel free to email me at fisherw@msu.edu if you have questions about these comments.
Best regards,
Wade
-
19
Test beam and performance study of ATLAS New Small Wheel small-strip Thin Gap Chamber
The Large Hadron Collider is expected to reach an instantaneous luminosity of $5-7.5\times10^{34}cm^{-2}s^{-1}$ towards high-luminosity runs in the future. The ATLAS Phase-Ⅰ upgrade plans to replace the present innermost station of Muon Spectrometer in the forward region, Small Wheels, with the New Small Wheel (NSW) detector system in order to improve Level-1 muon trigger selectivity and maintain good muon tracking capability under high background rate. The NSW features two gaseous detector technologies, Micro Mesh Gaseous Structures (MM) and small-strip Thin Gap Chambers (sTGC), with 2.4 million readout channels and a total surface area of more than $2,500m^2$. Both detectors have trigger and precision tracking capabilities.
The new Gamma Irradiation Facility (GIF++) located at the H4 beam line of SPS at CERN is a unique place where high energy muon and pion beams are combined with a 14TBq $^{137}$Cesium source to test the detector tracking ability in a high background rate environment. One fully integrated sTGC quadruplet was tested at GIF++ in a muon beam during Oct-Nov 2021. This is the first time a test beam is performed on the sTGC with final version electronics and using the final DAQ (data acquisition) system. In this talk we present the test beam setup and performance results, namely efficiency and resolution at different track inclination and photon background rates. Studies of the impact of different electronics configuration will also be presented.Speaker: Xinmeng Ye (University of Michigan (US) / University of Science and Technology of China (CN))This is a well-prepared talk, so I don't have too many suggestions for you. Overall you finished with plenty of time left, so you can consider going into a bit more detail on some of your figures. In general, it's good to describe the figures as you present them, which will take a bit of time. But you finished with at least 2 minutes, so I think you could do that.
Slide 3: it would be good to define sTGC here, as you already have the words written out.
Slide 4: it wasn't clear to me what the x-axis is in the figure.
Slide 9: I had a bit of a hard time following the figure in the lower left. This would be a good place to slow down and explain in a bit more detail.
Best regards,
Wade
-
20
Alignment system of the muon end-cap new small wheels
The muon spectrometer of the ATLAS detector at the LHC consists of thousands of muon precision chambers. Precise muon track reconstruction is crucial in order to achieve the physics goals of the ATLAS experiment, but attaining the required level of precision is not trivial due to the size and nature of the muon detectors. To reach the 80 microns precision needed to obtain a 10% precision on 1 TeV-momentum muon, an optical-based alignment system has been designed and installed on the muon spectrometer. In this talk I will describe this alignment system, which consists of thousands of coupled light sources and optical sensors, focusing on the upgrade and commissioning of the system for the New Small Wheels, a brand-new addition to the muon end-cap spectrometer.
Speaker: Camila Pazos (Tufts University (US))This is a very nice talk with a good pace throughout. I think you would benefit from a few practice runs to get the transitions down, but overall it flowed very well. Everything was quite clear, so I have only a few suggestions for you.
Slide 4: You did a great job defining acronyms throughout the talk, but one was errant: MDT = monitored drift tube
Slide 6: The difference between the proximity and azimuthal lines was not fully clear to me.
Slides 9-10: I don't think you mentioned how the light source positions are established from the images. Or is this not how the alignment proceeds?
Feel free to include backup slides to help answer any easily-anticipated questions you can think of.
Best regards,
Wade
-
21
Performance of sMDT chambers for the HL-LHC ATLAS muon spectrometer upgrade
New small Monitored Drift Tube (sMDT) chambers were developed by the Max Planck Institute (MPI) for the ATLAS muon spectrometer upgrade. The smaller tube size allows sMDT chambers to cope with the increased luminosity of the High Luminosity LHC (HL-LHC) and make space for additional Resistive Plate Chamber (RPC) layers. The University of Michigan will construct 48 sMDT chambers containing over 23,000 drift tubes by 2024. This talk will report on the methodology used to reconstruct cosmic-ray muon tracks in the sMDT chambers assembled at the University of Michigan, including a Geant4 simulation of the sMDT chambers. Chamber commissioning test results using cosmic-ray muons are presented, including noise rate, efficiency, and resolution studies.
Speaker: Kevin Michael Nelson (University of Michigan (US))This is a nicely-prepared talk and you did a good job presenting with a uniform flow throughout. You came in under time, so you can probably spend a bit more time on your figures. I'll try to give examples of where this could be done. Overall I have only a few comments, as it was a good presentation already.
Slide 2: MDTs definitely don't measure a muon's radius! Reword.
Slide 3: Neal Anderson's talk lists 18 chambers built, while you say 15. You two should be consistent.
Slide 4: This is a good place to spend a bit more time (~30 seconds) on explaining your figures.
Slide 5: This is a good place to spend a bit more time (~30 seconds) on explaining your figures.
Slide 8: You haven't defined BIS here. Folks outside ATLAS will not know what that is.
Slide 10: What are the data points in your plot on the right? They are not in the legend.
Slide 11: You quote 94% efficiency on the next slide. It would be good to show how you arrive at that number here.
Best regards,
Wade
-
22
sMDT Production and Testing at UM for the HL-LHC ATLAS Muon Spectrometer Upgrade
To accommodate the high trigger-rate conditions at the High Luminosity Large Hadron Collider (HL-LHC) in Run 4 and onwards, the Monitoring Drift Tube (MDT) chambers in the inner barrel layer of the ATLAS muon spectrometer will be replaced with new small-diameter MDTs. The upgrade will allow for better muon tracking resolution and for the installation of new Resistive Plate Chambers (RPCs) to maintain a high trigger efficiency. To ensure consistency and quality in each individual drift tube, a detailed construction and testing process is developed and used for the sMDT production process at the University of Michigan (UM) and Michigan State University (MSU). A major effort in tube production was made by UM during 2021 to ensure a timely sMDT chamber construction schedule. In this talk, I will present the cumulative testing results between the two sites which show an excellent production year in quality and quantity.
Speaker: Andy Chen (University of Michigan (US)) -
23
sTGC Trigger Chain Cosmic Ray Test
The New Small Wheel (NSW) phase-I upgrade is an extremely challenging project for high-luminosity LHC operations to improve both tracking and trigger capability of the ATLAS muon spectrometer for discoveries at the LHC.
NSW consists of two types of new detectors, the small-strip Thin Gap Chambers (sTGCs) and the MicroMegas (MM) chambers, both are capable of precision tracking and fast triggering. This is the first time such new detectors were built at large scales. It has taken 10 years to design and build the NSW. Intensive integration and commissioning were carried out in the past three years. I will report the sTGC integration and commissioning work, including the cosmic ray test. I will describe in detail about how the sTGC trigger chain works and present some important cosmic test results to demonstrate the sTGC level-0 trigger performance.
Speaker: Man Yuan (University of Michigan (US))This was a very nice presentation. You stayed within time and did not have to rush. I do have a few suggestions for you, but not many.
Slide 3: I think you can spend a bit more time talking about the figure shown here (don't call it a plot!).
Slide 4: Between slides 3 and 4, you need to define the sTGC acronym. Folks outside ATLAS will not know what this is.
Slide 7: Try to avoid parentheses within parentheses. I think the outer ones aren't needed. Spelling check on signal.
Slide 8: You should define what pi-network is if you want people to follow your argument.
Slide 11: There's a lot going on in these figures and you don't discuss them much. If you don't need to discuss all of the figure details, it's better to not show all of them. This would give you time to talk about what's happening in each figure.
Slides 12/13: I think you're using scintillator triggers for this. If so, you should just state it. If not, then I missed something.
Best regards,
Wade
-
18
-
Instrumentation IIConvener: Vallary Shashikant Bhopatkar (Argonne National Laboratory (US))
-
24
Development and Testing of the AMACStar ASIC at Penn for the ATLAS ITk Detector
In preparation for the high-luminosity LHC (HL-LHC), the ATLAS detector will be upgraded with a new silicon-strip charged-particle tracking detector (ITk strip detector) to satisfy the radiation, granularity and timing requirements. The AMACStar (Autonomous Monitor and Control) is one of three ITk application-specific integrated circuits (ASICs). It is designed to monitor and control temperatures, voltages, and currents in the detector modules. This is an essential function for the ITk detector; the ASIC can autonomously (and quickly) identify hazards in the detector modules, controlling and preventing them from spreading.
The ITk ASICs are produced on wafers containing several hundred chips. In order to ensure that each AMACStar chip works and performs as expected, a comprehensive probe-station testing software and procedure have been developed. This setup tests the digital and analog functionality of each AMACStar to be installed in the ITk modules. I will present the probe-station setup and probing results of pre-production AMACStar chips.
Speaker: Thomas Christopher Gosart (University of Pennsylvania (US))Overall slides were good but in the video, it was very difficult to hear the audio clearly. The quality of the audio sound needs to be improved. While recording, speak close to the mic very clearly. Also, use mp4 format to save the video.
The talk ran over the time by almost 3 mins. It needs to be under 12 minutes. Practicing more times can help you gather your thoughts while explaining the slides.
Slide1: spent almost 1:30 mins. The timing can be reduced slightly
Slide 5: spent more time on this slide and can be reduced by 15-20s.
Slide 6: It will be easy to understand if you point the cursor towards the components you are talking about while showing the probe station setup. Also it will help if you label components in the picture
Slide 13: X-Y axis and labels of the plots need higher font size for easy reading
Good Luck!
Vallary
-
25
ATLAS Tau Trigger Algorithm for Global Trigger using Full Granularity Data
The High-Luminosity Large Hadron Collider (HL-LHC) is expected to deliver 10 times the integrated luminosity as the previous three runs combined, with approximately 200 inelastic collisions per bunch crossing. This large increase in pileup imposes significant challenges on the ATLAS Trigger and Data Acquisition system hardware electronics. To meet this challenge, the Global Trigger is designed to accept full-granularity data from the calorimeter and muon systems at 40 MHz to perform offline-like trigger algorithms. Hadronically decaying tau leptons play a key role in Standard Model (SM) measurements and searches beyond the SM, but taus are challenging to trigger on due to their resemblance to QCD jets. A window-based tau trigger algorithm is being developed for the Global Trigger firmware using system Verilog. The presentation will focus on the progress on both software and the firmware aspects of this algorithm development as part of the ATLAS HL-LHC upgrade.
Speaker: Anni Xiong (University of Oregon (US))Overall nice talk. You stayed within the time limit. Please save the video in mp4 format
For all slides: Add slide numbers. Remove semicolons (;) after each bullet point. Keep the same space formatting between the bullet points
Elaborate little on the motivation
Slide1: add fb-1 after integrated luminosity 3000. Keep the same space formatting between the bullet points
Slide 5: Increase the size of the pictures, it is difficult to read the text.
General comment: do not read the text on the slides.
Good Luck!
Vallary
-
26
ATLAS Global Tau Trigger Performance Study for Run 4
Tau decays are notoriously difficult to detect because many particles decay with a similar signature. When searching for taus, capturing data from tau-lookalikes has been an ongoing problem, and previous global tau trigger algorithms have only had access to coarse granularity data from the calorimeters. The upgrade of the ATLAS Trigger and Data Acquisition system for the High-Luminosity Large Hadron Collider will provide high-granularity calorimeter information, offering enhanced performance required for operation during Run 4 (with 200 interactions per bunch crossing). Here we present the expected tau trigger performance, including the efficiency and background rejection.
Speaker: Katherine Rose Kaylegian-Starkey (University of Oregon (US)) -
27
CSM FPGA Irradiation Test at LANSCE for the HL-LHC ATLAS Muon Spectrometer Upgrade
The increased radiation environment and data rate for the High Luminosity Large Hadron Collider (HL-LHC) require upgrades to the readout electronics for the Muon Spectrometer (MS) electronics. In this talk, I will present ongoing irradiation studies of a custom-built front-end electronics board, the chamber service module (CSM), which is responsible for multiplexing data read out from on-detector electronics as well as passing configuration information to them. An important component of the CSM is a Field-programmable gate array (FPGA), specifically using the FPGA Artix7 xc7a35T, which is responsible for fanout of configuration and control information for 18 mezzanine cards. The Artix-7 is a commercial component with a history of meeting our radiation specifications. The specific model used in the CSM was tested in a radiation hard environment with an average flux 103 higher than ATLAS (6.02E+3 n/$cm^{2}$/s vs 1.3E+6 n/$cm^{2}$/s). Preliminary results show that the LANSCE Single Event Upset (SEU) test approximately had 3 years of ATLAS in comparison with ~ 1.9E+11n/$cm^{2}$/y fluence (MDT CSM Requirement) and accumulated 18 SEU errors for two boards.
Speaker: Jem Aizen Mendiola Guhit (University of Michigan (US)) -
28
Electrical characterisation of stave prototypes for the ATLAS ITk Upgrade
The ATLAS experiment is currently preparing for an upgrade of the inner tracking detector for High-Luminosity LHC operation, scheduled to start in 2027. The new detector, known as the Inner Tracker or ITk, employs an all-silicon design with five inner Pixel layers and four outer Strip layers. The staves are the building blocks of the ITk Strip barrel layers. Each stave consists of a low-mass support structure which hosts the common electrical, optical and cooling services as well as 28 silicon modules, 14 on each side. Two prototype electrical long-strip staves have been assembled at BNL.In this talk, we will present the deliverables of this prototyping phase highlighting the improvent of the stave layout and the results on the most recent stave.
Speaker: Francesca Capocasa (Brandeis University (US)) -
29
Hough Transform pattern recognition for track finding at the ATLAS experiment at the LHC
We are exploring Hough Transform (HT) algorithms in FPGAs to identify charged particle trajectories in the ATLAS detector at the HL-LHC. The Inner Detector of the ATLAS experiment measures the trajectories of charged particles in a uniform magnetic field. Our approach is to perform the Hough transformation pattern identification in two steps. The “first-stage” HT uses parameter space in phi0 and q/pT using hits from the semiconductor tracker and identifies those that are consistent with being from the same track. We evaluate adding a second HT step using eta-z0 track coordinate plane, that processes hits identified from roads in the first stage. A working firmware prototype for FPGAs is designed. The performance of this second stage HT is measured as the efficiency and rejection of MC simulations and is presented here, along with an estimation of the resources required of the firmware.
Speaker: Natalie Harrison (Ohio State University)The slides are good, though I have a few general comments.
You were under time. The total presentation took about 8:30 mins. You can extend your talk by 2 more minutes by spending more time on motivation and explaining the track identification method.
Slides are dense with the text. You don’t have to write everything that you are going to say. So you can use only highlighted points in the slides with figures and explain in detail those points when you give a talk.
You might have to re-record your video either using power-point or keynote based on which software you used for creating slides. They have a feature to record the slides with your audio and your slides as a video. (note: I have asked the committee to confirm this suggestion)
Good luck!
Vallary
-
30
Thermal and electrical performance tests of ATLAS silicon strip detector modules at BNL
The inner tracking detector of the ATLAS experiment at CERN is currently preparing for an upgrade to operate in the High Luminosity LHC, scheduled for the late 2020s. A complete replacement of the existing Inner Detector of ATLAS is required to cope with the expected luminosity and radiation damage. The all-silicon Inner Tracker (ITk) design under construction composes a mixture of Pixel and Strips layers. At the core of the strip, barrel detector is the stave, thermo-mechanical support structures, each of which hosts 28 silicon modules. A thorough characterization of the modules before the assembly on each stave is critical; thus, each module has to undergo electrical and thermal quality control (QC) testing between module production and stave assembly. The modules are thermal cycled ten times between -35C and +40C. This talk will discuss the thermal and electrical performance of the US testing setup, focusing on the difficulties encountered to meet the QC requirements. It will also give an overview of the results obtained by analyzing the first batch of produced modules during pre-production.
Speaker: Punit Sharma (University of Iowa (US))You have the right number of slides (12 slides) for an 11 mins talk but you extended your talk by almost 11 minutes. It’s a way over time. Practice more and think about what you want to say for each slide. You spend way too much time on a couple of slides.
Content looks good on the slides.
There are few comments about the timing and cosmetic changes as follows:
There is a mixed match of fonts on several slides. Make sure you are using the same font throughout all slides and for all bullet points except for equations or special characters
Slide 2: Tex size is too small to read clearly
Slide 3: You can go little faster on this slide to save time
Slide 4: You spend more than 3 mins on this slide, keep it under 1:15 mins
Slide 5: Be precise when you talk about the slide. Spent 3 mins on this slide
Slide 6: Spent about 3 mins
Slide 7: two different fonts than the original and the text size is small. Spent 2:20 mins
Slide 8: time spent 2:40 mins
Slide 9: 1:27 mins
Slide 10: You are using a different font than the original one, Took a couple of long pauses during this slide. Slide time 1:10mins (Here you spend the right amount of time)
Slide 11: 1min
Slide12: 1:50 mins
In general, spend an average of 1 min on the slide. Please practice and record the video again and stay under 12 mins.
Good Luck!
Vallary
-
24
-
MLConveners: John Stupak (University of Oklahoma (US)), Walter Lampl (University of Arizona (US))
-
31
Point Cloud Deep Learning Methods for Pion Reconstruction in the ATLAS Detector
Reconstructing the type and energy of isolated pions from the ATLAS calorimeters is a key step in hadronic reconstruction. The existing methods were optimized early in the experiment lifetime. We recently showed that image-based deep learning can significantly improve the performance over these traditional techniques. This note presents an extension of that work using point cloud methods that do not require calorimeter clusters to be projected onto a fixed and regular grid. Instead, we use transformer, deep sets, and graph neural network architectures to process calorimeter clusters as point clouds. We demonstrate the performance of these new approaches as an important step towards a full deep learning-based low-level hadronic reconstruction.
Speaker: Mariel Pettee (Lawrence Berkeley National Lab. (US))Hello Mariel,
nice talk, only a few comments:
Slide 3: The placement of the label on the plot is a bit unfortunate, as it covers part of th e plot.
Slide 8: The acronym "LCW" might not be understood outside of ATLAS.
- Walter
Very nice talk! Just one minor comment: I think you *could* skip slide 2, if you want. This conference is HEP and related folks, so they should be familiar with ATLAS. But I could also understand why you want to go over this, since your talk is somewhat technical and depends on the details of the detector.
-John
-
32
Quark and Gluon Tagging Calibration with the ATLAS
The separation of quark and gluon initiated jets(q/g jets) is crucial to enhance the reach of many new physics searches at the ATLAS experiment in the Large Hadron Collider. A tagger serving as a tool to distinguish quark and gluon jets is developed based on the Boosted Decision Tree using charged-particle track observables associated with the jet. However, quark-versus-gluon jet tagging is difficult to be calibrated due to the difficulty of the hadronization modeling. To improve the performance of the tagger, a "matrix method" is applied to extract the q/g distributions to obtain a scale factor which is a ratio between data and Monte Carlo. The data taken from 2015 to 2018 with an integrated luminosity of 139.0 fb-1 are used to calibrate the tagger with two control samples to select dijet and gamma+jet events, providing various gluon and quark enriched samples. In this talk, the latest results of calibration and systematic uncertainties will be presented.
Speaker: Haoran Zhao (University of Washington (US))Very nice presentation! I have just a few minor comments:
s2: for a short talk like this, IMO a table of contents is not necessary
S3: it would be nice to make the plot larger
s6: why isn't the BDT significantly better than the track multiplicity based tagger?
S9: I wasn't able to follow your explanation. Can you clarify this? I also can't read the plot labels
s12: "Uncertainties" would be a better title, since you list stat uncertaintyGeneral comments:
-You should check with the relevant conveners to make sure it is okay to show your WIP plots (particularly those with data)Regards,
JohnNice presentation, just one minor comment:
On slide 3, the text and the plot overlap a bit. I would make the text smaller.
- Walter
-
31
-
SM IConveners: John Stupak (University of Oklahoma (US)), Walter Lampl (University of Arizona (US))
-
33
Study of W^±Z longitudinal-longitudinal interactions ($W_0^{\pm} Z_0$) with Full Leptonic Final States ($W^{\pm} Z \rightarrow l^{\pm} νl^{\pm} l^{\mp}$)
In the Standard Model of particle physics, the spontaneous symmetry breaking of the complex Higgs field gives rise to the massive Higgs boson and three Goldstone bosons, which represent the longitudinal degrees of freedom of the $W^{\pm}$ and $Z$ bosons. It is therefore critical to study the interactions of longitudinally-polarized $W^{\pm}$ and $Z$ bosons ($W^{\pm}_0$ and $Z_0$). Here, we present the first such analysis, in inclusive fully-leptonic final states ($W^{\pm} Z→l^± νl^± l^∓$) with 139 fb$^{-1}$ of proton-proton collision data recorded with the ATLAS detector at a 13 TeV of center of mass energy. We use kinematic variables like $p_T^Z$ and $p_T^{W^{\pm}Z}$ to enhance the $W^{\pm}_0Z_0$ contribution. The so called radiation amplitude zero effect also enhances the $W^{\pm}_0Z_0$ contribution in the central region ($\cos\theta_V$ ~ 0, where $\theta_V$ is the scattering angle of the $W^{\pm}$ or $Z$ boson in the parton center-of-mass frame). A multivariate variable is developed to separate the longitudinal-longitudinal polarization from other polarizations. A template fit will be performed to extract polarization fractions.
Speaker: Prachi Atmasiddha (University of Michigan, Ann Arbor)Very nice presentation! I have just a few minor comments:
s2: for a short talk like this, IMO a table of contents is not necessary
s3: your video somewhat obscures the slide
S8: there is a lot of text here. Can it be summarized symbolically?
S10: I would not call pT(Z) good agreementGeneral comments:
-You should check with the relevant conveners to make sure it is okay to show your WIP plots (particularly those with data)
-Several plots are labelled "work in progress" without an "ATLAS" label. Are these ATLAS plots? If so, they need the ATLAS label.Regards,
John
Nice presentation, just one minor comment:
The second bullet of the Summary slide (13) is a bit awkward. How about "We are working the see the Radiation Amplitude Zero effect in the data."
- Walter
-
34
Measurement of collinear W boson emission off high transverse momentum jets using full Run-2 data.
The production of a single electroweak vector boson in association with jets (V+jets) is one of the fundamental processes at the Large Hadron Collider (LHC) experiment. The leptonic decay modes of this process provides a clean experimental signature for measuring the electroweak sector of the Standard Model and the perturbative QCD accuracy in multi-jets final states.
In the talk, we will focus on the differential measurement of single W decaying to an electron or muon from a high transverse momentum jet with small angular separation, the so called collinear W+jets production. This measurement makes use of the LHC full Run-2 proton-proton collision datasets, corresponding to an integrated luminosity of 139.0 fb-1 . The data is compared against newly develop state-of-the-art multi-jet merged setups accurate to next-to-leading order in the strong and weak coupling constants. The details of the generator configurations and their CPU costs will be discussed, and unfolded kinematic distributions at particle level in the collinear W+jets phase-space will be compared with the measured data cross sections.
Speaker: Yuzhan Zhao (University of California,Santa Cruz (US))Very nice presentation! I have just a few minor comments:
s2: I don't understand your diagram. The image on the right appears to have a W which is perfectly colinear with a jet, but you say you are actually interested in the case on the left where the W is less collinear. I think you should remove the orange jet on the right to make your point.
s5: Units should not be italicizedGeneral comments:
-You should check with the relevant conveners to make sure it is okay to show your WIP plots (particularly those with data)Regards,
JohnNice presentation, just one minor comment:
The text on the backup slide 17 look likes notes for yourself ("placeholder").
- Walter
-
35
Study of WWZ tri-boson production at ATLAS
The Standard Model predicts self interactions between gauge bosons, including triple gauge boson couplings (TGC) and quartic gauge boson couplings (QGC). In addition, the interactions between the Higgs boson and gauge bosons are also of interest. In ATLAS group, events with four leptons (electrons or muons) in the final state are used to search for the production of WWZ -> lvlvll. The total luminosity used is 139 fb-1 at sqrt{s}=13 TeV. Events are further divided into three categories based on the invariant mass and the flavor of the two leptons from the decays of the two W bosons to increase the search sensitivity. A multivariate variable is further developed to increase the separation between the signal and background. I will present optimization on event selection and search sensitivity studies using simulated Monte Carlo events.
Speaker: Zhichen Wang (University of Michigan (US))Very nice presentation! I have just a few minor comments:
S10: can you add a plot or two of the most important variables?General comments:
-All ATLAS plots should have "ATLAS" label. If the plot is internal, it should additionally have "Work in Progress" label.Regards,
JohnNice presentation, just a few minor comments:
Slide 9, last bullet
"Continuos b jet aceptance feed into BDT in the future" sounds a bit strange to me. How about: "Plan to feed Continuos b jet aceptanceinto BDT"Slide 11, top right plot (signal/background) has no axis labels. I assume the plots on this slide are yours (un-approved)? Please add "ATLAS work in progress".
- Walter
-
33
-
SM IIConveners: Miha Muskinja (Lawrence Berkeley National Lab. (US)), Tae Min Hong (University of Pittsburgh (US))
-
36
Measurement of four-jet production in the ATLAS experiment
Measurements of multi-jet cross-section ratios are presented.
The measured quantities are the ratio of the four-jet and three-jet
cross-sections and the ratio of the four-jet and two-jet cross-sections.
The data were collected with the ATLAS detector in proton-proton
collisions at a center of mass energy of 13 TeV during 2015-2018.
The results are presented as a function of the transverse jet momentum.
Predictions from different Monte Carlo event generators are compared
to the data.Speaker: Zahra Farazpay (Louisiana Tech University (US))Miha
Thank you for preparing the recording! My main comment is that all plots need an ATLAS label. If they are not published, they need the "ATLAS Work in Progress" label as explained here: https://twiki.cern.ch/twiki/bin/view/AtlasProtected/NationalMeetingsPhysicsSchools. Few other minor comments below.
p3: You nicely said why aS is important, but it could also be pointed out in a bullet point.
p4: "to search and study new physics" is a bit vague. There is also a whole Standard Model programme dedicated to precision measurements such as yours.
p5: Minor comment about the Muon Spectrometer-- the main purpose is the identification of muons. Muon momentum is really determined from a combination of the ID and MS measurements (not MS alone).
p7: Great slide!
p8: Why was only the 2018 data used? By the 'summer data', do you mean the Run 3 data? Before adding Run 3 data it will probably be easier to add the Run 2 data from 2015, 2016, and 2017.
p10: Not clear what 'software' you are referring to. Do you mean the MC Generator software?
-
37
Cross section measurement of associated $J/\psi+W^{\pm}$ production with the ATLAS detector
The cross-sections of prompt and non-prompt production of $J/\psi+W^{\pm}$ are being measured by the ATLAS Collaboration using the $139~\textrm{fb}^{-1}$ Run II 13 TeV $pp$ collision data set. The prompt production of $J/\psi$ associated with a $W^{\pm}$, where both particles are produced in a single parton-parton interaction, provides constraints on models of non-relativistic QCD, especially in the realm of heavy quarkonia production. The measurement is an all-leptonic final state with $J/\psi\rightarrow\mu^+\mu^-$ and $W^{\pm}\rightarrow\ell^{\pm}\nu$, and it is performed differentially in $J/\psi$ transverse momentum and rapidity. Finally, the non-prompt measurement allows for the study of top production and $b$-quark fragmentation.
Speaker: Charles Burton (University of Texas at Austin (US))Miha
Very nice presentation overall! My main comment is that you mention 'SPS' and 'DPS' multiple times through the talk, but it only gets introduced at slide 11. You indeed said that it will be introduced later during the talk, but in this case it really seems like it would be easier to understand the talk if these terms were introduced at the very beginning. If you analysis can distinguish between SPS and DPS production than this also serves as a good motivation for the analysis. Furthermore, in page 2 you introduced CS and CO production, but it is not mention again later on. Could this be skipped?
p2: Try avoid using abbreviations, especially the ones like CS and CO that most people will not be familiar with.
Could you explain a bit more the difference between color singlet and color octet and how that translates into the shown feynman diagrams. Perhaps also mark the relevant differences in the diagrams more clearly.
Chuck: All good points. I removed the confusing language from the introduction. This measurement is not actually targeting any specific models, so I just dropped the references to the specific "color-singlet" and "color-octet" production modes. Just referencing "QCD quarkonia production models"
p10: Do you also require the two muon tracks to be compatible with the primary vertex? I would expect this to be a strong way of reducing the background from pileup.
Chuck: This is true, but we explicitly want to keep some of the pileup in order to estimate the pileup overlapping the signal delta-z=0. (By comparison, we could remove lots of non-prompt J/psi's by cutting on flight distance, but we use the high-tau shape to fix the non-prompt contribution at tau=0.)
-
38
Measurement of Z plus Heavy Flavor Jets Differential Cross Section with Full Run-2 ATLAS data
Measurements of the production rate of Z bosons in association with heavy quarks provide sensitive tests of perturbative quantum chromodynamics (pQCD) predictions, which are made at next-to-leading-order (NLO) accuracy using either a 4-flavor number scheme (4FNS) or 5-flavor number scheme (5FNS). In the 4FNS, b-quarks are not present in the parton distribution functions (PDFs) and only appear as a product of gluon splitting ($g\to bb$). In the 5FNS, on the other hand, a (massless) b-quark PDF is included. A previous analysis studying $Z\to ee/\mu\mu$ + b-jet events using 2015 & 2016 data showed that the 5FNS predictions match the data well, while the 4FNS predictions underestimate the data. The uncertainties are substantial, however. In our analysis we are attempting to further investigate these results by also including Z + c-jet events and looking at the combined “heavy-flavor” (b+c) region to reduce uncertainties. We are also updating the 2015-2016 results with 140 $\rm{fb}^{−1}$ (up from 35.6 $\rm{fb}^{−1}$) of ATLAS Run-2 data at $\sqrt(s)= 13$ TeV. This is still a work in progress, but important milestones will be presented.
Speaker: Alec Drobac (Tufts University (US))Miha
The presentation was very interesting and the background estimation techniques and unfolding methods that you presented are really impressive! However, many plots did not have axis titles which made it a bit hard to follow at times. Please also make sure that all plots have an ATLAS label (e.g. ATLAS Work in Progress if not published). See the TWiki page for the instructions: https://twiki.cern.ch/twiki/bin/view/AtlasProtected/NationalMeetingsPhysicsSchools.
Minor comments:In general, try avoid using abbreviations. For example, you state what PCBT means, but the audience who is not familiar with ATLAS nomenclature will probably forget later on what it stands for.
Similar for the L, C, B labels. In many cases you have enough room to write out "light flavor".
p4: The Z->ee(mumu) + b(b) nomenclature is not fully clear because parentheses have different meaning in each case.
p7 - p8: You say that these are percentages, but it would be good to add an axis title as well
p12 - p13: It is not clear how the matrix is transformed. In once case the axis limits are [0, 1400] and in the other case they are [0, 10]. Label titles and units would be really useful here. I think you say it out loud, but if someone is just looking at the slides they will be confused.
p14: Without axis titles this is hard to follow.
-
36
-
SUSYConveners: Miha Muskinja (Lawrence Berkeley National Lab. (US)), Tae Min Hong (University of Pittsburgh (US))
-
39
Search for B-L RPV Supersymmetry Through Stop Pair Production in Final States with 2 b-jets and 2 Leptons Using the Run 2 Data from the ATLAS Detector
Supersymmetry is a natural solution to many phenomena left unexplained by the Standard Model, such as the hierarchy problem that arises due to quantum corrections to the Higgs boson mass. Models which allow for R-parity violation (RPV) are favored by recent lepton flavor anomalies and can provide insight into the neutrino mixing hierarchy. The direct pair production of the stop, the supersymmetric partner to the top quark, is of particular interest due its sizable production cross section at the LHC, which allows for searches at the TeV scale. We present a search for stop pair production, with each stop decaying via an RPV coupling to a b quark and a charged lepton. This final state with two oppositely-charged leptons and two b-quark-initiated jets allows for a high reconstruction efficiency. The reconstructed mass asymmetry is used to properly pair candidate jets and leptons to form stop candidates, enabling powerful background rejection. In this talk, I will discuss the current work on the B-L RPV stop analysis using the full Run 2 dataset collected with the ATLAS detector.
Speaker: Mx James Heinlein (University of Pennsylvania (US))Miha
The presentation is already very good! I appreciated the introduction which was really helpful for me (as a non-SYS expert). Please double check the time. Is it 10 or 15 minutes at the conference? I have a few comments and questions below to consider.
p3: I think the bottom right plot needs a bit more explanation. What does the 'probability' mean in this context?
p8: How come there is no requirement on MET?
p9: Suggest clarifying how are these uncertainties defined. For example, some of them are very low. What does a 1% uncertainty mean? Surely the uncertainty on the background itself is larger than 1%?
p10: Suggest stating in the slides which variable you are planning to fit in the multi-bin fit.
p10: Are the multiple SRs going to be orthogonal? It is not entirely clear why you need multiple SRs if they are already binned in mass across a wide range.
p12: Suggest adding a rough statement about the expected improvement.
Tae
Very nice.
If you are presenting this in person, many of the items on your slides are too small for the audience to read. Do you expect them to read it? If so, blow it up. This could be figures, legends, variable names, text, or whatever it is. Or put some labels on top of whatever it is. Or add arrows pointing to it.
p2. Organization can be better. Also, too many words.
p9: It would be more satisfactory if you can give a simple one-bullet reason why the ttbar error is so large in the table. And how you are proposing to improve it. Doesn't have to be too much detail, but it would add substance. I see that you do this later on p11. Mention here that you'll talk about it later.
p10: This slide confuses me. There's bin width, signal width (which I assume is decay width), etc.
The talk feels too long by a couple of minutes. Can it be more punchy? Also some of the statements throughout the presentation feels like it can be more punchy. You have a lot of nice stuff!
Many of your references are arXiv, which is fine, but the downsides of this is that I can't tell who the authors are for the theory papers. Does it matter? Maybe not. If it does, I'd do a more standard journal reference. Same with Theorists at Penn. If it matters who did it, I'd name them.
Good job!
-
40
Search for Higgsinos Decaying into Semi-Long-Lived Charged Particles in the ATLAS Detector with LHC Run 2 Data
Higgsinos with compressed mass spectra and masses near the electroweak scale are highly motivated by naturalness considerations and consistent with cosmological evidence, yet still poorly constrained by the LHC. This search will focus on the neutralino mass splitting $Δm=m_{{\widetilde{χ}}_2^0}-m_{{\widetilde{χ}}_1^0}$, in the region of 0.3~2 GeV, which has not been covered by ATLAS analyses to date. The current limit set by LEP only excludes up to $m_{{\widetilde{χ}}_1}$~95 GeV. We plan to probe higher masses by identifying the track corresponding to a soft charged pion from the slightly long-lived (with cτ ~1 mm) higgsino decay. The analysis will look for the associated production of higgsino-like chargino (${\widetilde{χ}}_1^\pm$) and neutralino (${\widetilde{χ}}_2^0$) in LHC pp collisions using the ATLAS Run-2 dataset. The event signature includes a high momentum jet from initial state radiation, and a displaced pion $π^\pm$ from ${\widetilde{χ}}_1^\pm/{\widetilde{χ}}_2^0$ decay aligned with significant missing energy in the transverse plane. Using Monte Carlo simulation, I will present a preliminary sensitivity estimate for $m_{{\widetilde{χ}}_1^0}$~150 GeV, and suppression strategy against backgrounds from semi-long-lived particles using track energy loss and secondary vertex reconstruction.
Speaker: Sicong Lu (University of Pennsylvania (US))Miha
Thank you for preparing the recording. This is a lot of impressive work! Please see the comments below.
General comments
How much time do you have for the presentation (the recording is 15 min)?
The slides contain a lot of information. It show that you really are an expert on this topic, however, people not familiar with SUSY and long lived particle searches might get lost or confused at times. In some cases you have many plots on one slide, but in my opinion you don't take enough time to explain what the plots are showing (e.g. p14). Perhaps it would be good to go through the slides and remove some of the points that are not strictly necessary for the understanding.
Minor comments
p3: People not familiar with SUSY will probably not know what the parameters tan beta, mu, M1, M2, mA are. Is there any way to make this more friendly for non-experts? Do they need to be stated out loud? I don't think these parameters are shown later on.
p4: Something may have went wrong here since the deltaM diagram did not show up in the recording for a long time. Please have a look at the recording and make sure that everything is fine with the presentation here.
I was a bit confused after this sequence of slides and did not totally understand what you are searching for. Are you searching both for "disappearing tracks" and "displaced tracks"? It would be good to clearly state the goal of the search. Perhaps you don't need to talk about both in detail if you are only focusing on one of them in the following.
p8: Very nice display! However, it would be good to explain how the diagram works since this is not something people usually see. I assume the vertical bars show the relative yields, but that is not stated.
There are too many significant digits in the yields. For example '25583.63 +- 120.22' could be written as '25580 +- 120', or something similar. I suggest you pick some convention and apply it to all yields, but generally in ATLAS we don't give more than two significant digits in such cases.
p9-10: Suggest explicitly stating what the backgrounds in these plots are. It is a bit hard to quickly see that from the legend.
p13-14: Try avoid using the jargon here. What are 'sister tracks'? What does 'SingleMom' mean? The audience not familiar with these terms will get confused.
p15: What is the significance of the 2D plot? I was expecting you to say something about it.
-
39
-
PosterConveners: Miha Muskinja (Lawrence Berkeley National Lab. (US)), Tae Min Hong (University of Pittsburgh (US))
-
41
Predicting the missing transverse momentum trigger rate at ATLAS with machine learning
One of the challenges of the ATLAS missing transverse momentum trigger is understanding how the trigger rate will evolve with the number of proton collisions per bunch crossing, or pileup. In the past, the data have been fit to parametric functions and extrapolated to higher pileup values. In this poster, we present a new technique using machine learning regression models to describe the trigger rate, and allow for extrapolation to higher values of pileup.
Speaker: Chandler Baker (Westmont College) -
42
Investigating Gluon Fusion as New Channel to Search for Dark Matter
In Higgs portal models, it is predicted that the Higgs boson could decay into dark matter particles. We may be able to detect these processes with the ATLAS detector, located at the Large Hadron Collider in Geneva Switzerland. There are many different production modes of the Higgs boson that could be used in a search for these Higgs boson to invisible decays, and when used together they provide our best chance at discovering new physics. Previous work has been done with vector-boson fusion production (VBF), but gluon fusion (ggF) production has a larger cross section, making it a promising candidate to aid in the search. Therefore, we are investigating the feasibility of using a MET+photon trigger at ATLAS to provide sensitivity to ggF production of the Higgs boson; Large MET is characteristic of any Higgs boson to invisible decay, and the photon requirement would provide sensitivity to $H \rightarrow \gamma\gamma_{d}$ decays, where $\gamma_{d}$ is a dark photon.
Speaker: Connor Harrison Menzel (University of Pittsburgh (US))Miha
This is very impressive work and it is great that you are presenting it at the APS meeting!
In some places it was hard to follow because I could not link your spoken words to the text in the poster very well. I have a few suggestions that you can consider:
- If given virtually: zoom-in to the part you are presenting
- If given virtually: guide the audience with a mouse pointer over the parts that you are currently talking about
- Make it clear when you are switching between the sections (e.g. I could not tell when you switched between Abstract / Objectives and Results / Next Steps)
- Use bullet points instead of whole sentences in Abstract and Next Steps sectionsOther more specific comments
You say that you want to implement a new L1 trigger. However, this is not clearly stated in the poster. Perhaps you can rephrase the "Document trigger and analysis cut flow for use at ATLAS" bullet a bit? Implementing a new trigger is really a big task and a great achievement, so it is worth pointing that out more clearly.
Is the placement of the feynman diagram optimal? It seems like having it in the abstract section would be better because you talk about ggF production and dark photons already there.
-
43
ATLAS NSW sTGC Readout Electronic Integration and Commissioning
The most challenging ATLAS Phase I upgrade project during Long Shutdown 2 (2019-2021) is the New Small-Wheel (NSW) for Muon Spectrometer. The main purpose of the NSW upgrade is to improve the performance of muon triggering and precision tracking for the High-Luminosity Large-Hadron-Collider (HL-LHC), which will deliver 3,000 fb-1 of data at √s = 14 TeV. The NSW will feature two new detector technologies: Resistive Micromegas (MM) and small-strip Thin Gap Chambers (sTGC), with MM playing the role of a primary tracking detector and sTGC as a primary trigger. To retain the good precision tracking capabilities in the high background environment of the HL-LHC, each sTGC plane must achieve a spatial resolution better than 100 μm to allow reconstruction of the Level-1 trigger track segments with an angular resolution of approximately 1mrad. This presentation focuses on the electronic readout integration and readout commissioning of sTGC detectors at CERN, both in the integration phase and for the two, separate, NSW commissionings, including a summary of the progress achieved, the problems encountered, and adapted solutions.
Speaker: Nicholas Graves Kyriacou (University of Michigan (US))Miha
This is a very nice poster with lots if interesting information!
My general comment is that this will be presented to a vide audience of physicists who are not necessarily familiar with the ATLAS muon detection. I think non-experts will struggle with some parts because they are very technical and contain a lot of acronyms and jargon. Think about whether you really need to mention all acronyms. If yes, it would be good to define and explain them. For example, the FELIX chip was mentioned several times but never introduced I believe.
Indeed, using your mouse pointer to guide the audience was very useful and the zoom-in feature also helped a lot, so keep using that!
Further comments about specific sections below.
New Small Wheel
-----------Not all audience will be familiar with the LHC vs HL-LHC specifications. Perhaps it is worth pointing out the difference in the instantaneous luminosity so that the audience will have a better feeling of the scale of the problem.
The "Micromegas" detector is mentioned here but never defined or talked about later.
sTGC Muon Detector
-----------Perhaps mark the 1.8mm and 3.2mm pitch in the picture below.
-
44
Commissioning of the Phase-1 BIS78 pilot project for Phase-2 upgrade of the ATLAS muon spectrometer
The Monitored Drift Tube (MDT) provides precise tracking and momentum measurement in the ATLAS muon spectrometer. To accommodate higher event rates and provide better fake rejection in the High Luminosity LHC, a new integrated chamber with small-diameter MDT (sMDT) and thin Resistive Plate Chambers (tRPC) had been developed and will be installed into barrel inner layer of the muon detector for the phase-2 upgrade. The BIS78 project serves as a pilot project for the barrel inner layer upgrade (1 < |η| < 1.3) during the LHC LS1 shutdown (2019-2021). Several sMDT+tRPC chambers have been installed and operated in the ATLAS detector. An overview of the commissioning status of BIS78 in the ATLAS experiment will be presented.
Speaker: Meng-Ju Tsai (University of Michigan)Miha
The poster looks great and it was very interesting to see. I'm not an expert on this topic, so I got a bit confused in a few parts. Please see the comments below which might help with the clarity a bit.
Some of the plots were also a bit difficult to read, so it might be a good idea to zoom-in in each pannel when you are presenting.The ATLAS detector and BIS78 project
-----------It was hard for me to keep track of which parts already got replaced and which parts will be replaced in LS3. It might help to state how many BIS stations there are in total? If I understand correctly, so far we only replaced one half of one BIS station?
Benefit from the phase-2 upgrade
-----------The word 'BIBO' was not defined. Suggest to either define it or avoid using it. It might be enough to just explain to the audience that they should compare the red histogram to the sum of the red, blue, and green in the plot.
Surface commissioning of BIS78 tRPC
-----------A few phrases are not quite clear in this section and it would be good to rephrase or explain them.
"(η OR φ) efficiency"
-> What do the eta / phi refer to here?"singlet efficiency"
-> What is is a singlet?
Commissioning of BIS78 sMDT
-----------"Good inclined track passing through several mezzanines"
-> What makes it "good"? What is the picture telling us?Not clear what the two different curves on the middle left plot are.
Why is there no data for "Module 0" in the middle right plot? What is "Module 0"?
-
45
Improvements to and Functionality Testing of ATLAS Online Trigger Rate Prediction Tool in Preparation for Run 3
The ATLAS detector at the LHC is subject to millions of events per second. ATLAS employs a trigger system to select events of high importance for offline storage. To ensure the triggers are working as expected, we use a software tool called xMon, which has been in operation in the ATLAS control room for a decade. xMon works by predicting the trigger rate based on offline fits from previous runs, which can then be compared to the live trigger rates at ATLAS. We discuss the recent developments to prepare xMon for Run 3: (1) formatting the new visual interface hosted within the Grafana TRP dashboard, (2) analysis of results from pilot beam data, (3) addition of a bunch factor callback function.
Speaker: Enzo Daniele Brandani (University of Pittsburgh (US))Miha
This is a nice and a very interesting poster! I have a few comments that you could consider below.
General comments
If presented virtually, consider using the mouse pointer to guide the audience and zoom-in to the parts of the poster you are presenting.
I believe that Figure 2 was never explicitly pointed out and explained. Consider talking about it more at the relevant time.
Several acronyms are used. Make sure that they are all defined in the text. Furthermore, it would be better to spell them out verbally when you are givin the presentation in my opinion. For example, I could not remember what PAP and OTF stand for and it would be easier to follow if you always spelled them out.
Section specific comments
Reference Based Predictions / OTF Predictions
-----------It would be good to point the audience to Figure 1 when you talk about the attenuation period, since the figure really nicely demonstrates that. Do you understand why the blue curve on the figure goes way up and suddenly drops down to the online / predicted baseline after 10h? That's a question that someone could easily ask.
Automated Bunch Factor
-----------What is the IS monitor? Better to avoid acronyms if possible when presenting to a non-expert audience.
Grafana
-----------What does TRP stand for?
-
46
Improvements to and Functionality Testing of ATLAS Online Trigger Rate Prediction Tool in Preparation for Run 3
The ATLAS detector at the LHC is subject to millions of events per second. ATLAS employs a trigger system to select events of high-importance for offline storage. To ensure the triggers are working as expected, we use a software tool called xMon, which has been in operation in the ATLAS control room for a decade. xMon works by predicting the trigger rate based on offline fits from previous runs, which can then be compared to the live trigger rates at ATLAS. We discuss the recent developments to prepare xMon for Run 3: (1) formatting the new visual interface hosted within the Grafana TRP dashboard, (2) analysis of results from pilot beam data, (3) addition of a bunch factor callback function.
Speaker: Enzo Daniele Brandani (University of Pittsburgh (US))
-
41
-
-
-
PlenaryConveners: John Stupak (University of Oklahoma (US)), Walter Lampl (University of Arizona (US))
-
47
Expected physics reach for the High-Luminosity LHC
The High-Luminosity Large Hadron Collider (HL-LHC) project, a planned upgrade to the Large Hadron Collider (LHC) at CERN, is scheduled to begin colliding protons at unprecedented instantaneous luminosity later this decade. The HL-LHC will deliver an unprecedented proton-proton collision dataset to the LHC experiments at a center-of-mass energy of 14 TeV. The experiments - ATLAS, CMS, LHCb, and ALICE - have planned a series of major detector upgrades to prepare for the higher instantaneous luminosity and center-of-mass energy, as well as the increase in simultaneous collisions (or pileup) foreseen for the HL-LHC program. These upgrades will allow the experiments to maintain or improve physics performance, despite the more challenging environment. Using the HL-LHC dataset, we will be able to improve on statistically-limited Standard Model measurements, and extend the sensitivity of searches. In this talk, we present a selection of physics prospects for the HL-LHC, including Higgs boson properties, searches for Standard Model Higgs pair production, and searches for new physics beyond-the-Standard-Model.
Speaker: Elizabeth Brost (Brookhaven National Laboratory (US))
-
47
-