Conveners
Precision SM Measurements: 1
- Pippa Wells (CERN)
Precision SM Measurements: 2
- Hafeez Hoorani (National Centre for Physics (PK))
Precision SM Measurements: Poster session
- There are no conveners in this block
Precision SM Measurements: Parallel 1
- Junjie Zhu (University of Michigan (US))
Precision SM Measurements: Parallel 2
- Reinhild Peters (University of Manchester (GB))
Precision SM Measurements: Parallel 3
- Gregory Soyez (IPhT, CEA Saclay)
Precision SM Measurements: Parallel 4
- Oldrich Kepka (Czech Academy of Sciences (CZ))
Precision SM Measurements: 3
- Florian Urs Bernlochner (University of Bonn (DE))
Measurements of W/Z-boson production in association with jets are an important test of perturbative QCD prediction and also yield information about the parton distribution functions of the proton. Cross sections for Z-boson production in association with jets of high transverse momentum are presented. We will also discuss results of Z-boson production in association with heavy-flavour jets. If...
The search for the most dominant decay mode of the Higgs boson, $H→b\bar{b}$, proved to be an elusive and challenging due to the low signal-to-background ratio, and a diverse range of backgrounds arising from multiple Standard Model processes. The use of the production in association with a W or Z boson, while reducing the overall rate of the process, allowed on the other hand to use...
In the Standard Model, the Higgs boson can decay invisibly only through two Z bosons further decaying to neutrinos. The branching ratio for this process is predicted to be very small. However, in some Beyond Standard Model (BSM) theories, the Higgs boson can also decay to weakly interacting particles, candidates for Dark Matter (DM), that can not be detected by the ATLAS detector and arise as...
Photonuclear interactions dominate the interaction rate at large impact
parameters of the colliding heavy ions via ultra-peripheral collisions
(UPC). These processes allow us to study an evolution of the gluon
content of protons and nuclei in new kinematic regime at the LHC.
The study of J/psi production allows for perturbative QCD considerations
which address the gluon saturation and...
Searches for the supersymmetric partner of the top quark with the CMS experiment at the LHC are presented. This poster includes the combination of three general-purpose analyses and a targeted one. The latter specifically probes a region of the parameter space where the kinematics of top squark pair production and top quark pair production are very similar, because the mass difference between...
The LHC Run 2 data-taking period marked the first measurement of the CP structure of Higgs Yukawa coupling to tau leptons. This measurement is complementary to the ones performed in Higgs production mechanisms improving the understanding of CP violation in the Higgs sector. The amount of CP-admixture in the Yukawa coupling introduces a correlation between the transverse spin of the two tau...
In 2012, the observation of the Higgs Boson was announced by the CMS and ATLAS experiments at CERN. Since the discovery, work has continued to measure the Higgs boson couplings and quantum numbers with greater precision. There are several production channels of the Higgs boson and we are searching for the production of the Higgs boson in association with a vector boson in the H→WW decay...
The study of the conversion decay $ \omega \to \pi^{0}e^{+} e^{-} $ in the decay channel $\pi^{0} \to \gamma \gamma$ was performed with the CMD-3 detector at the VEPP-2000 $e^{+} e^{-}$ collider in Novosibirsk. Main background processes are events of $\omega \to \pi^{+}\pi^{-}\pi^{0}$ decay, QED events and events of the radiative decay $\omega \to \pi^{0}\gamma$, where monochromatic photon...
The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in 2015. Presented is the final stage, a next-to-next-to-leading order (NNLO) analysis of the HERA data on inclusive deep inelastic ep scattering together with jet data as published by H1 and ZEUS. A pQCD fit to the data with free $\alpha_s(M_Z^2)$ and free PDFs was used to determine $\alpha_s(M_Z^2)$ with the...
Exclusive photoproduction of $\rho^0(770)$ mesons is studied using the H1 detector at the ep collider HERA. A sample of about 900000 events is used to measure single- and double-differential cross sections for the reaction $\gamma{}p\to\pi^{+}\pi^{-}Y$. Reactions where the proton stays intact ($m_Y=m_p$) are statistically separated from those where the proton dissociates to a low-mass hadronic...
Due to the high production of light mesons J/ψ radiative and hadronic decays, the largest sample of J/psi events accumulated at the BESIII detector offers a
unique laboratory to study the light mesons spectroscopy and search for the light exotic states. In this talk, we shall report the recent progresses on the light meson spectroscopy achieved at BESIII.
The BESIII experiment at the electron positron collider BEPCII in Beijing is successfully operating since 2008 and has collected large data samples in the tau-mass region, including the world's largest data samples at the J/psi and psi(2S) resonances. The recent observations of hyperon polarizations at BESIII opens a new window for testing CP violation, as it allows for simultaneous production...
We shall report recent measurements of branching fractions of J/psi, chi_cJ or psi(2S) decays. It will contains the following studies: branching fraction of psi(2S)-> Sigma anti-Lambda +c.c., inclusive branching fraction of psi(2S) -> Ks + anything, observation of chi_cJ -> n Ks anti-Lambda, branching fraction of J/psi and psi(2S) -> Sigma+ anti-Sigma-.
With the data samples collected above DDbar open charm threshold at BESIII, Born cross sections of electron positron annihilation into various final states have been measured, in order to search exotic charmonium-like states. Some recent results will be reported in this presentation including the following processes: e+ e- -> D*s+ DsJ-, e+ e- -> gamma chi_c0/1/2, e+ e- -> pi+ pi- psi(2S),...
The R value, defined as the ratio of the inclusive hadronic cross section and the muon cross section in e+e- collisions, is an important input for the calculation of the Standard Model predictions of the anomalous magnetic moment of the muon a_mu and the running of the QED coupling constant alpha_QED(m_Z) evaluated at Z pole. The BESIII collaboration has collected data with high statistics...
We present the resummed predictions for inclusive cross-section for the production of Higgs boson
at next-to-next-to leading logarithmic ($\rm \overline {NNLL}$) accuracy taking into account both soft-virtual ($\rm SV$) and next-to SV ($\rm NSV$) threshold logarithms. We derive the $N$-dependent coefficients and the $N$-independent constants in Mellin-$N$ space for our study. We match the...
A measurement of the CP structure of the Yukawa interaction between the Higgs boson (H) and top quarks in event samples enriched in association of a H with one (tH) or two (tt H) top quarks, is presented. The measurement is based on data collected in proton-proton collisions at √s = 13 TeV by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 137 fb−1. The...
Single top quark production is the subleading production process of top quarks at the LHC after the top quark pair production. The latest measurements of single top quark production (tW) cross sections are presented using data collected by the CMS detector at a center-of-mass energy of 13 TeV. The results are confronted with precise theory calculations.
An accurate calibration of the energy measurement of electron and photon is needed for many ATLAS physics analyses, such as the Higgs boson mass measurement. The calibration of the energy measurement is performed in-situ using a large statistics of Z->ee events. A prerequisite of this calibration is a good understanding of the material in front of the calorimeter and of the inter-calibration...
The top quark is the heaviest known fundamental particle and has the largest coupling to the Higgs boson. As it is the only quark that decays before it hadronizes, this gives the unique opportunity to probe the properties of bare quarks. This contribution will provide an overview of recent measurements of top-quark production cross sections and its mass and properties in proton-proton...
The top mass has been measured to sub percent accuracy, however, using Monte Carlo (MC) event generators, that induce an additional O(1 GeV) ambiguity in the measurement due a lack of precise field theoretic definition of the Monte Carlo top mass scheme. I will describe how the groomed jet mass distribution for boosted, hadronically decaying, top jets at the LHC is a promising observable for...
LHCb has recently measured the properties and production of many known charm and beauty baryons, as well as discovered many previously unobserved states. The latest results from the LHCb Collaboration on heavy flavoured baryons are presented.
Electromagnetic form factors allow to investigate fundamental properties of the baryons.
The BESIII collaboration has studied the time-like form factors of the proton and neutron with significantly improved precision. An intriguing periodic behavior of effective form factors lineshape is observed for both proton and neutron. Hyperons provide a unique avenue to study the strong interaction in...
Studying electron-positron annihilation into $K_SK\pi$ and $K_SK\pi\pi^0$ with the CMD-3 detector
A. A. Uskov.
Budker Institute of Nuclear Physics, Siberian Branch of the Russian Academy of Sciences.
We studied the process $e^+e^- → KK\pi$ with the СMD-3 detector at the electron-positron collider VEPP-2000. The statistics collected by the СMD-3 detector in the energy range of...
Many mesons and baryons with additional valence constituents with respect to the conventional quark-antiquark pair or three-quark combinations have been discovered in the last decades, leading to a renaissance of hadron spectroscopy. Interpretations of such states span from compact objects to hadronic molecules and searches for new exotic candidates provide important insights on the quarks...
With the oncoming start of Run 3 approaching, it is interesting to look at the current status of Higgs Yukawa coupling measurements. Run 2 marked the first observation of Higgs couplings to all third-generation charged fermions. This talk reviews these measurements together with their properties under CP symmetry. The ongoing research of coupling to second-generation fermions is also discussed.
With the full Run 2 pp collision dataset collected at 13 TeV, very detailed measurements of Higgs boson properties can be performed using its decays into bosons. This talk presents measurements of Higgs boson properties using decays into bosons, including production mode cross sections and simplified template cross sections, as well as their interpretations.
With Run-3 of the LHC fast approaching, the analyses of the full Run-2 dataset for Higgs precision couplings and differential cross-sections are being completed. The talk will cover the 4l, diphoton, WW, di-tau and bb channels, as well as dedicated measurements in ttH and VH production. These measurements provide the greatest global constraints on our knowledge of Higgs boson properties to...
Combining measurements of many production and decay channels of the observed Higgs boson allows for the highest possible measurement precision for the properties of the Higgs boson and its interactions. These combined measurements are interpreted in various ways; specific scenarios of physics beyond the Standard Model are tested, as well as a generic extension in the framework of the Standard...
Double Higgs boson production is extremely rare at the LHC. By searching over a wide variety of final states, searches for double Higgs production can provide key insights into the nature of the Higgs self-coupling and the Higgs potential, as well as providing constraints on BSM models that allow for resonant decays of new particles into Higgs bosons. The talk will cover searches for resonant...
The Standard Model predicts several rare Higgs boson decay channels, among which are decays to a Z boson and a photon, H to Zgamma, to a low-mass lepton pair and a photon H to llgamma, and to a meson and photon. The observation of some of these decays could open the possibility of studying the CP and coupling properties of the Higgs boson in a complementary way to other analyses. In addition,...
Measurements of jet cross sections in proton collisions with the CMS experiment are presented. Measurements are performed as a function of the jet transverse momentum pT and jet rapidity. Jets are reconstructed using the anti-kT clustering algorithm with different size parameters in a wide phase space region in jet pT and jet rapidity. The measured jet cross sections are corrected for detector...
We present fits to determine parton distribution functions (PDFs) using inclusive W/Z-boson and W+jets measurements from the ATLAS experiment at the LHC. The ATLAS measurements are used in combination with deep-inelastic scattering data from HERA. We also present the results of PDF fits that use Z+jets measurements from ATLAS in addition to the measurements listed above. An improved...
A first measurement of the 1-jettiness event shape observable in neutral-current deep-inelastic electron-proton scattering is presented. The 1-jettiness observable $\tau_{1b}$ is defined such that it is equivalent to the thrust observable defined in the Breit frame. The data were taken in the years 2003 to 2007 with the H1 detector at the HERA ep collider at a center-of-mass energy of 319 GeV...
Collective behaviour of final-state hadrons, and multiparton interactions are studied in high-multiplicity $ep$ scattering at a centre-of-mass energy $\sqrt{s}=318$ GeV with the ZEUS detector at HERA. Two- and four-particle azimuthal correlations, as well as multiplicity, transverse momentum, and pseudorapidity distributions for charged-particle multiplicities $N_{\rm ch} \geq 20$ are...
The first measurement of lepton-jet momentum imbalance and azimuthal correlation in lepton-proton scattering at high momentum transfer is presented. These data, taken with the H1 detector at HERA, are corrected for detector effects using an unbinned machine learning algorithm (OmniFold), which considers eight observables simultaneously in this first application. The unfolded cross sections are...
The LHCb detector is a full spectrometer at forward rapidity covering a pseudorapidity range of $2<\eta<5$. With its excellent vertex resolution, particle identification and tracking capability, the LHCb is able to perform precision measurements down to very low transverse momentum. We present first LHCb results on heavy flavor in lead-lead collisions at 5.02 TeV, including photoproduction of...
The LHCb experiment covers the forward region of proton-proton collisions, and it can improve the current electroweak landscape by studying the production of W and Z boson in this phase space complementary to ATLAS and CMS. In this talk an overview of the wide LHCb electroweak measurement program will be presented. In particular several preliminary studies have shown the potential of the LHCb...
This talk reviews recent measurements of multiboson production using CMS data. Inclusive and differential cross sections are measured using several kinematic observables. This talk also discussed recent vector boson scattering measurements.
Measurements of multiboson production at the LHC probe the electroweak gauge structure of the Standard Model for contributions from anomalous couplings. In this talk we present recent ATLAS results on the measurement of electroweak production of a Zgamma pair in association with two jets and the first observation of three W boson production. We also present the differential cross-section...
We present the resummed predictions for inclusive cross section for Drell-Yan (DY)
production up to next-to-next-to leading logarithmic ($\rm \overline{ NNLL}$) accuracy taking into account both
soft virtual (SV) and next-to SV (NSV) threshold logarithms. We restrict ourselves
to resummed contributions only from quark anti-quark ($q \bar q$) initiated channels. The resummation is...
[Talk will not happen live, recording to be uploaded on Friday]
The study of the associated production of vector bosons and jets constitutes an excellent enviroment to check numerous QCD predictions. Total and differential cross sections of vector bosons produced in association with jets have been studied in pp collisions using CMS data. Differential distributions as function of a broad range...
