PLHC2011 - Physics at LHC 2011

5 Jun 2011, 16:00 → 11 Jun 2011, 16:00 Europe/Zurich

Perugia Congress Center GIO

Daniel Denegri (DAPNIA), Gian Mario Bilei (INFN Perugia), Giancarlo Mantovani (Univ. and INFN Perugia), Guenakh Mitselmakher (University of Florida), Leonardo Rossi (Sezione di Genova), Thomas Le Compte (Argonne National Laboratory)

This is the sixth Conference in the series started in Prague in 2003 and held in Prague (2003), Vienna (2004), Cracow (2006) , Split (2008) and at DESY (Hamburg site) in 2010.

The conference covers the following topics: 
    * Higgs physics
    * Supersymmetry
    * Standard Model and beyond
    * Top physics
    * Beauty physics
    * Heavy-ion physics
    * Diffraction and forward physics

• PLHC 2011 Conference main web site and registration:
  www.pg.infn.it/plhc2011/  
     
• PLHC2011 link to Conference Poster Session
   

Sunday, 5 June

16:00 Arrival and Registration

Monday, 6 June

08:00 Arrival and Registration

1A - Opening, LHC Machine and Experiments

1 Welcome (5')

Speaker: Giancarlo MANTOVANI (INFN and Univers. of Perugia)

Slides Organization.pdf

2 CERN: status and future plans (30'+5')

Speaker: Sergio Bertolucci (CERN)

Slides 02_-_PLHC2011_SB.pdf 02_-_PLHC2011_SB.pptx

3 Status and Plans of LHC (30'+5')

Speaker: Gianluigi Arduini (CERN)

Slides Perugia_06062011_last.pdf Perugia_06062011_last.pptx

4 Status of ATLAS (30'+5')

Speaker: Ludovico Pontecorvo (INFN and University of Roma I)

Paper PLHC-Pontecorvo.pdf

Slides PLHC-Ludo-Final.pdf

5 Status of CMS (30'+5')

Speaker: Guido Tonelli (INFN and University of Pisa)

Slides 04_-_GUIDO_P_LHC_06_06_2011.pdf 04_-_GUIDO_P_LHC_06_06_2011.ppt

13:00 Lunch

1B - LHC Experiments

6 Status of Totem (20'+5')

Speaker: Nicola Turini (University of Siena and INFN Pisa)

Paper article_Totem.pdf

Slides 01_-_Totem_PLHC.pdf

7 Status of LHCf (20'+5')

Speaker: Oscar Adriani (INFN Firenze)

Paper Adriani_PLHC2011_proceedings.pdf Adriani_PLHC2011_proceedings.tar

Slides Adriani_PLHC2011.pptx

8 Status of ALICE (30'+5')

Speaker: Johannes Wessels (WWU Münster)

Paper alice_wessels.pdf

Slides PLHC_alice_status_jpw.pptx

9 Status of LHCb (30'+5')

Speaker: Andreas Schopper (CERN)

Paper PLHC2011_Schopper.pdf PLHC2011_Schopper.zip

Slides 04_-_LHCb_PLHC2011.pdf 04_-_LHCb_PLHC2011.pptx

18:00 Official Opening and Reception

Reception in the Cloister of the Cathedral at 8:00 pm

Tuesday, 7 June

2A - Soft QCD, Heavy Ion and Diffractive Physics

10 Soft gluons and soft Physics (25'+5')

Speaker: Francesco Hautmann (ITP Oxford Univ.)

Slides 01_-_tk_plhc11.pdf

11 PDF for LHC Physics (20'+5')

Speaker: Stefano Forte (INFN and University of Milano)

Slides perugia.pdf

12 Soft QCD results from Alice Experiment (20'+5')

The ALICE experiment at the LHC has studied p-p collisions at several center-of-mass energies (namely, sqrt(s)= 0.9, 2.36, 2.76 and 7 TeV). Although the main focus of the experiment is on the study of nuclear collisions, many aspects of p-p physics can be addressed by ALICE. In particular, soft observables (charged hadron multiplicity, identified particle spectra and ratios, Bose-Einstein correlations, azimuthal correlations) have been extensively studied, and a selection of hard probes (heavy flavours, J/psi) has also been investigated. In this talk, the results obtained in the 2010 run and in the first part of the 2011 run will be summarized, with emphasis on the soft QCD ones.

Speaker: Luciano Ramello (INFN and Univ Piemonte Orientale)

Paper ramello_plhc2011.ps Compressed (zipped) folder containing the LaTeX source, 8 figures in .eps format, and the resulting PostScript file.

Slides Ramello_PLHC2011_final.pdf Ramello_PLHC2011_final.ppt

13 Onia at LHC (20'+5')

The LHC opens new frontiers in heavy flavour physics through an unprecedented statistical reach for a variety of interesting states produced in pp collisions. The four experiments have excellent complementary acceptances and good mass resolutions to provide a complete picture of quarkonium production. We will analyse the recent quarkonium results of the four LHC experiments, comparing them with the recent theoretical developments and in the different rapidity regions. Prospects for future results will also be given.

Speaker: Giulia Manca (INFN and Univ. Cagliari)

Paper manca_plhc.tar

Proceedings manca_plhc_proceed.pdf

Slides manca_P_at_LHC.pdf

10:45 Coffee Break

2B - Soft QCD, Heavy Ion and Diffractive Physics

14 Heavy ION theory (30'+5')

Speaker: Dmitri KHARZEEV (STONY BROOK UNIVERSITY)

Slides plhc_kharzeev_2011.pdf

15 Heavy ION at RHIC (30'+5')

Speaker: Gary WESTFALL (MICHIGAN ST. UNIVERSITY)

Slides HeavyIonPhysicsRHIC2011_v2.pdf

16 Heavy ION at LHC (30'+5')

In November 2010, the LHC experiments, ALICE, ATLAS and CMS, took first Pb-Pb data at the unprecedented centre of mass energy per nucleon pair of 2.76 TeV. This talk gives an overview of the first physics results obtained with these data.

Speaker: Andreas Morsch (CERN)

Paper PLHC_amorsch.pdf

Slides PLHC_morsch.pdf

13:00 Lunch

2C Parallel - Heavy Ion

17 Heavy-ion results from the CMS experiment (15'+5')

We present early results of the CMS experiment from PbPb collisions at $srqrt{s_{NN}}$ = 2.76 TeV, probing quark and gluon matter at unprecedented values of energy density. The capabilities of the CMS apparatus allows us to investigate various hard probes, as well as bulk particle production and collective phenomena, using the calorimetry, muon and tracking systems covering a large range in pseudorapidity, complemented by a flexible two-level trigger system. We will review the latest results among which we will highlight: 1/ Detailed jet quenching studies from unbalanced dijets, high momentum charge particle suppression, b-quark quenching though its displaced decay to J/psi, and firs measurement of fragmentation functions, 2/ Unmodified electroweak reference probes : isolated photons, Z and W bosons, 3/ Quarkonia suppression, in particular the suppression of Upsilon excited states.

Speaker: Raphael Granier De Cassagnac (Ecole polytechnique, CNRS-IN2P3)

Slides 2011.06.07.PLHC.pdf

18 Theoretical perspectives on Heavy Ion LHC program (20'+5')

The extended kinematical reach in the collisions of heavy ions at the LHC opens several possibilities: new phenomena might emerge, while "known" observables are cast under a new light. I shall present a few examples of such effects, as well as tentative conclusions that could be drawn from the 2010 Pb+Pb run.

Speaker: Nicolas Borghini (Univ. of Bielefeld)

Slides 02_-_Borghini.pdf

19 Baryon number transport at LHC energies with the ALICE experiment (15'+5')

The Large Hadron Collider (LHC) provided the first p+p collisions in the period of November-December 2009. Since then, a large data sample has been recorded by all LHC experiments. This event sample allows us to study more and more exotic particles and events. The ALICE (A Large Ion Collider Experiment) experiment, though designed primarily to study heavy ion collisions, has a rich proton-proton physics program. The characteristic features of ALICE are its very low-momentum cut-off, the low material budget and the excellent PID and vertexing capabilities. In this presentation, we discuss the results from the analysis of p+p collisions at the different LHC energies – √s = 900GeV, 7TeV and 2.76TeV. We concentrate on the baryon transport studies which are of great importance since they allow to determine the carrier of the baryon number (BN). In particular, the multiplicity, rapidity and transverse momentum dependence of the p(bar)/p, ʌ^0(bar)/ʌ^0, Ξ^+/Ξ^- and Ω^+/Ω^- ratios will be shown. The results will be compared with different theoretical predictions. Finally, the energy dependence of the mid-rapidity ratios will be presented.

Speaker: Michal Broz (Comenius University-Slovakia)

Paper mBrozProceedings.pdf proceedings.tar

Slides mBroz.Baryons.pdf

20 Results from lead-lead collisions at sqrt(s_NN)=2.76 TeV with ATLAS at the LHC (15'+5')

A broad program of measurements using heavy ion collisions is underway in ATLAS, with the aim of studying the properties of QCD matter at high temperatures and densities. With the factor of 14 increase in collision energy compared to RHIC data, significant insight has already been gained using dijet asymmetry measurements, but a more detailed study of both high pT probes and global features of the collisions is well underway. Elliptic flow is measured over 5 units of pseudorapidity, from -2.5 to 2.5, and over a broad range in transverse momentum, 0.5-20 GeV. The results will be discussed in the context of previous measurements and theoretical model predictions. We also present precision measurements for the first six flow harmonics ($v_1$-$v-6$) using both the event plane method as well as two-particle correlations, a broad $p_T$ range, and with fine centrality selections. The impact of these results on extracting features related to genuine jet-medium interactions will be discussed. The centrality dependence of the particle density near mid-rapidity scaled by the number of participating nucleon pairs (dNch/dη(|η| < 0.5)/(0.5Npart)) is presented, as well charged particle spectra and their ratios in different centrality bins over a wide range of transverse momenta and pseudorapidity. The centrality dependence of single muon production is used to study the production of W± and heavy flavor, which are sensitive to initial and final state effects, respectively. Finally, we will present results from ATLAS measurements of single jet production, di-jet correlations and jet fragmentation in Pb+Pb collisions at $\sqrt{s_{NN} = 2.76$~TeV. These results include an update on the original di-jet asymmetry analysis using the full statistics from the Fall 2010 LHC Pb+Pb run.

Speaker: Tomasz Bold (UC Irvine, AGH-UST Krakow)

Paper proceedingsBoldPLHC11.tar

Slides 2011-06-PLHC-HeavyIons-ATLAS.pdf

2E Parallel- EWK

21 EWK di-boson production in ATLAS (15'+5')

The production of pairs of bosons is an important process for investigating the electroweak sector of the Standard Model. We present measurements of the diphoton, Z+photon, W+photon and WW production cross sections. Constraints on the couplings are also presented.

Speaker: Johannes Ebke (Ludwig-Maximilians-Univ. Muenchen)

Paper http://cdsweb.cern.ch/record/1390422 proceedings_ebke.tar.gz

Slides talk.pdf

22 Status of Higgs and EW cross-sections for the LHC (20'+5')

A short review of the status of theoretical calculations and their uncertainties for the most relevant electroweak processes at the LHC is presented

Speaker: Fulvio Piccinini (INFN Pavia)

Paper piccinini.pdf piccinini.tex

Slides piccinini.pdf

23 Vector boson production in ATLAS (15'+5')

Electroweak bosons are a "standard candle" process for physics at the LHC. We present measurements of total inclusive W and Z production cross sections, as well as differential cross sections and the W charge asymmetry.

Speaker: Lashkar Kashif (University of Wisconsin-Madison)

Paper Kashif_proc.pdf

Slides Kashif_vecBos_PLHC_2011.pdf

tarball Kashif_proc.tar

24 Study of W and Z production, lepton charge asymmetry and Z differential cross sections at CMS (15'+5')

We present various measurements with W and Z bosons, based on 36 inverse-picobarns of pp collisions at √s = 7 TeV recorded by the CMS detector at the LHC in 2010. The results, obtained in the electron and muon channels, are compared to predictions at the NLO or NNLO in QCD using recent sets of parton densities. We first report on the inclusive W- and Z-boson production cross sections, measured in the acceptance of the detector as well as extrapolated to the full acceptance. The main uncertainty on the cross sections is 3.4%, from the integrated luminosity measurement. Other systematic uncertainties are comparable to the statistical uncertainties, of the order of 1 to 2%. We also present measurements of the lepton charge asymmetries in W events, covering the central pseudo-rapidity region up to 2.4 for electrons and 2.1 for muons. The size of the total experimental error in each bin of lepton pseudo-rapidity is comparable to the theory uncertainty due to the parton densities. Finally we present corrected and unfolded measurements with Drell-Yan pairs: transverse momentum and rapidity differential cross sections in the Z mass region (60 < M(ll) < 120 GeV) in the di-electron and di-muon channels, and Drell-Yan invariant mass spectrum from 15 to 600 GeV in the di-muon channel.

Speaker: Hwidong Yoo (Purdue University)

Slides Hwidong_PLHC_EWK.pdf

25 Studies of electroweak boson production in the forward region with LHCb (15'+5')

We report on measurements of W+, W– and Z0 production, using data taken by the LHCb experiment at sqrt(s) = 7 TeV during 2010. The electroweak bosons are reconstructed by selecting decays to muonic final states. The cross-sections are measured within the region 2 < eta < 4.5, using muons of transverse momenta exceeding 20 GeV/c, as well as differentially as a function of lepton pseudorapidity (for W) and boson rapidity (for Z). Measurements of the W charge asymmetry as a function of lepton pseudorapidity are obtained for different lepton transverse momentum thresholds in the same forward region, providing constraints on the u and d valence partons. Results are compared to NLO and NNLO predictions.

Speaker: Stephen Farry (UC Dublin)

Paper article.pdf FarryPLHCProceedings.tar.gz

Slides PLHC2011.pdf

16:15 Coffee Break and poster session

26 Opening of the Poster Session

Poster Session https://indico.cern.ch/conferenceDisplay.py?confId=141546

2D Parallel - Heavy Ion and Soft QCD

27 Jet Reconstruction and the Evolution of Background Effects in Pb-Pb Collisions Measured with the ALICE Experiment at the LHC (15'+5')

The suppression of high-pT hadron production in central heavy-ion events compared to proton-proton collisions, known as jet quenching, reflects the parton energy loss in a hot and dense medium which is produced in heavy-ion collisions. The reconstruction of jets provides a more direct link to the initial hard-scattered partons and its modified fragmentation process. The measurements in proton-proton collisions offer a clean sample of jets and a baseline, while the jet reconstruction in heavy ion collisions is strongly affected by soft background from the underlying event. For an appropriate interpretation of the jet observables it is essential to understand the influence of the background and its fluctuations on the reconstructed jets. With this purpose we embed a well-defined probe into measured heavy-ion data and study its reconstruction in the presence of large backgrounds. We will present the status of jet reconstruction based on charged particles with the ALICE experiment and the influence of background effects in heavy-ion collisions on the reconstructed jet spectrum.

Speaker: Bastian BATHEN (UNIV. OF MÜNSTER)

Slides Bathen_Perugia_PLHC2011_Final2.pdf

28 ATLAS measurements of particle multiplicities and correlations (15'+5')

Particle multiplicities and correlations are an important feature of physics at the LHC. They provide an insight into the environment in which all ATLAS physics measurements are performed. Measurements of charge and neutral particle multiplicities and of two-particle correlations with the ATLAS detector, made as a variety of centre-of-mass energies, are presented. These measurements are used to refine phenomenological models and probe production mechanisms.

Speaker: James William Monk (DPA University College London)

Slides jmonk_PLHC.pdf

29 Forward physics at the LHC (20'+5')

Totally inclusive quantities such as the total and inelastic pp cross-sections at the LHC along with proposals for the measurements and estimates of pion proton and pion pion cross-sections will be discussed.

Speaker: Yogendra Srivastava (INFN and Univers. Perugia)

Slides PLHC_June_7_2011_Perugia.pdf

30 Electromagnetic Dissociation Measurement at LHC with ALICE ZDC (15'+5')

New data on neutron emission in electromagnetic dissociation Pb ions at LHC will be presented. The measurement was performed by means of the Zero Degree Calorimeters (ZDC) of the ALICE experiment, which consists of two identical sets of detectors located at opposite sides with respect to the beam intersection point, ~114 m away from it. Each set of detectors include a neutron (ZN) and a proton (ZP) Zero Degree Calorimeter. In particular the ZN is placed at zero degrees with respect to the LHC axis and detects neutral particles at pseudorapidities eta>8.7. During the 1.38+1.38 ATeV Pb-Pb data taking, a dedicated run has been performed, requiring a minimum energy deposition in at least one of the two ZNs. The trigger tagged essentially neutrons emitted in the Coulomb breakup of the excited lead nucleus. The neutrons from electromagnetic dissociation are expected to be emitted very close to beam rapidity and with an average energy close to the one of the beam. Thanks to the good ZN energy resolution, the measured energy spectra show a clean separation of the single neutron contribution from the 2n, 3n... ones. The experimental results will be presented and compared to theoretical predictions.

Speaker: Nora De Marco (INFN and Univers. Torino)

Paper demarcoplhc2011_proc.pdf

Slides 04_-_PLHC2011.pdf 04_-_PLHC2011.ppt

31 Underlying event studies at CMS (15'+5')

A measurement of the underlying activity in scattering processes with a pT scale in the several GeV region is performed in proton-proton collisions at sqrt(s) = 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity eta < 2 and pT > 0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a “track-jet”. A significant growth of the average multiplicity and scalar pT sum of those particles is observed with increasing pT of the leading track-jet, followed by saturation above a few GeV/c. A hardening of the multiplicity distribution, of the scalar pT sum distribution, and of the charged particle pT spectrum is also observed. For track-jet pT larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centre-of-mass energy increase from 0.9 to 7 TeV. Predictions of several QCD-inspired models as implemented in PYTHIA are compared to the data.

Speaker: Paolo Bartalini (NTU- Taiwan)

Paper article.pdf PLHC_2011.zip

Slides Bartalini_Perugia_V6c.pdf Bartalini_Perugia_V6c.pptx

32 Transverse sphericity in minimum bias p-p collision at 0.9 and 7 Tev with ALICE (15'+5)

A study of the linearized sphericilty in minimum bias proton-proton collisions at sqrt(s) = 0.9 and 7 TeV with the ALlCE detector at the LHC is presented. The observable was measured in the plane perpendicular to the beam direction and using primary charged tracks in |eta|<=0.8. The average sphericity as a function of multiplicity is reported for events with different hardness ("soft" and hard") defined by a cut on the transverse momentum of the leading particle. In addition to those studies the average transverse momentum versus multiplicity was measured for different event classes. Data are compared with PYTHIA6 (tunes: ATLAS-CSC and PERUGIA-0), PYTHIA8 and PHOJET. The behavior of the linearized sphericity and of the mean p_t with multiplicity indicates that the current event generators tend to "build up" multiplicity by generating more jets while on the contrary the data indicate that at high multiplicity the events tend to be more isotropic and the mean p_t smaller.

Speaker: Antonio Ortiz Velasquez (ICN UNA Mexico)

Paper aortiz_proceedings.tar proc_aortiz_4.pdf

Slides Perugia_aortiz_QCDSoft.pdf

2F Parallel - Hard QCD and Diffractive

33 Multijets and the internal structure of jets measurements at ATLAS (15'+5')

Studies of the internal structure of jets, and of events with high jet multiplicities, provide a stringent test of QCD. These important standard model process may also hide, or reveal, new physics. We present measurements of multijet cross sections and distributions, of the subjet structure in high-pT jets, and of the distribution of charged particle inside jets.

Speaker: Bilge Demirkoz (IFAE, Barcelona)

Paper article.pdf demirkoz_article.tar.gz

Slides PLHC-demirkoz.pdf

34 Measurements of forward energy flow and forward jet production with CMS (15'+5')

We present measurements of the forward (3 < |eta| < 5) energy flow in minimum bias events and in events with either hard jets or W and Z bosons produced at central rapidities, as well as measurements of the inclusive forward jet cross section and of associated production of forward and central jets. Results are compared to MC models with different parameter tunes for the description of the underlying event and to perturbative QCD calculations, the PYTHIA and HERWIG parton shower event generators, as well as to the CASCADE Monte Carlo

Speaker: Alexander Flossdorf (DESY)

Paper

• article.tex
• fwd003_final_Jet_crossection.eps
• fwd006_central_XS_herwig.eps
• fwd006_central_XS_pythia.eps
• fwd006_forward_XS_herwig.eps
• fwd006_forward_XS_pythia.eps
• fwd008_COMBINED_E_HF_otherside.eps
• fwd008_COMBINED_rapcorr.eps
• fwd008_COMBINED_trackmult_lrg.eps
• fwd008_ehf_eFigure4a.eps
• fwd008_trackmult_eFigure4b.eps
• fwd011_dijet_7_generators.eps
• fwd011_dijet_900_generators.eps
• fwd011_mb_generators.eps
• paper

Slides plhc_forward_cms_flossdorf.pdf

35 Higher-order effects in QCD and EW cross sections at the LHC (20'+5')

Speaker: Radja Boughezal (Argonne NL)

Slides 03_-_boughezal_perugia.pdf

36 Diffraction and the Inelastic Cross Section measurements with ATLAS (15'+5')

A measurement of the inelastic cross section for proton-proton collisions at 7 TeV centre-of-mass energy is present. In addition the separate contributions of single- and double-diffractive dissociation are measured, and the differential cross section as a function of rapidity gap is presented.

Speaker: Oldrich Kepka (IP Prague)

Slides perugiaPLHC2011_kepka1.pdf

37 Exclusive measurements (di-leptons and vector mesons) at CMS (15'+5')

A measurement of exclusive production of muons pairs in pp collisions at \sqrt{s} = 7 TeV is presented. Events are selected requiring the observation of two muons and no other activity in the CMS detector. Single differential cross sections are obtained as function of the dimuon transverse momentum, invariant mass and acoplanarity for dimuon pairs with an invariant mass above 11 GeV. Data are compared to predictions of the LPAIR Monte Carlo model for elastic, single and double proton-dissociative $\gamma\gamma -> \mu\mu$ production.

Speaker: Krzysztof Piotrzkowski (Universite Catholique de Louvain)

Slides plhc.pdf

38 Exclusive dimuon measurements with LHCb (15'+5')

We report on studies of exclusive dimuon production, using LHCb experimental data. Muon pairs can be exclusively produced by two-photon fusion (a QED process ideally suited to obtaining a precise integrated luminosity measure), or by resonance production. We show results for exclusive dimuon production, and first observations of the exclusive J/Psi, Psi(2S) and Chi_c states, obtained with 37 pb–1 of data at ,-sqrt(s) .= 7 TeV. We compare our cross-section mesasurements to predictions.

Speaker: Valentin Niess (LPC-Inst. Nat. Phys. Nucl. et P.)

Paper edimu.pdf

Slides niess-CEP.pdf

Wednesday, 8 June

3A - Electroweak and hard QCD

39 Production of the Higgs boson and other electroweak objects at the LHC (25'+5')

Speaker: Frank Petriello (Northwestern Univers. and ANL)

Slides pLHC2011.pdf

40 EWK/hard QCD results from Tevatron (25'+5')

Speaker: Junjie Zhu (University of Michigan)

Paper article_JunjieZhu.pdf

Slides pLHC_EW_QCD_Zhu.pdf

41 EWK results from CMS (20'+5')

We present the results of electroweak studies performed using data collected in 2010 at a center-of-mass energy of 7 TeV by the CMS experiment at the LHC. Besides their intrinsic interest as unique samples to calibrate and understand the CMS detector response to leptons, jets and missing energy, events containing W and Z bosons appear as dominant components in many Higgs seaches and in most of the searches beyond the Standard Model, either as signal or as background. In addition, the excellent level of theoretical and experimental understanding of these processes allows electroweak tests at the LHC at an unprecendented level of precision. CMS uses a wide range of final states to measure cross sections, asymmetries, polarizations and differential distributions in general. The integrated luminosity in 2010 was already sufficient to perform not just inclusive measurements using W and Z decays into electrons and muons, but also precise studies of associated jet production and final states containing taus, as well as first measurements of diboson cross sections and associated b-jet production.

Speaker: Luca Lista (INFN and Univers. Napoli)

Paper

• cmsth.eps
• proceedings.pdf
• proceedings.tex

Slides 03_-_ewk-cms-plhc2011.pdf

42 Recent EWK results from ATLAS (20'+5')

The talk will summarize recent results in W/Z production for the full 2010 data sample. These results include the inclusive W/Z cross-sections, the W asymmetry, the PT(Z) distribution, and studies of W+jets and Z+jets production. Many comparisons with state of the art calculations are included. First results on di-boson production will also be presented, including WW, WZ, and W/Z+gamma results, with a first glimpse at the new 2011 data. Comparisons are made to SM expectations.

Speaker: Matthias Schott (CERN)

Slides PLHC_Talk_Electroweak.pdf PLHC_Talk_Electroweak.ppt

10:50 Coffee Break

3B - Electroweak and hard QCD

43 Hard QCD: theoretical aspects (25'+5')

Speaker: Giulia Zanderighi (University of Oxford)

Paper plhc-zanderighi.pdf

Slides 01_-_hard_QCD_theo.pdf

44 Hard QCD results from CMS (25'+5')

CMS is pursuing a rich program of hard QCD physics. Jet and photon cross section measurements are reported on inclusive and di-object production, as well as ratios of 3/2 jet and photon+jet cross sections. The QCD multi-jet dynamics is studied with event-shape variables, dijet azimuthal decorrelation and dijet angular distributions. Inclusive forward jet production and associated production of forward and central jets have been measured as function of jet transverse momentum. The experimental results are compared to the pQCD calculations as well as various Monte Carlo generators.

Speaker: Konstantinos Kousouris (Fermilab)

Slides PLHC2011_Kousouris.pdf

45 Recent Hard QCD results from ATLAS (25'+5')

The LHC provides a new regime to probe perturbative QCD and for which MC generators need to be tested to pave the way for BSM searches. The results of several studies performed in ATLAS using the full 2010 data sample are presented: inclusive jets and dijets cross sections,azimuthal decorrelations, multijets, dijets with jet veto, jet sub-structure, b-jet and prompt-photon production. In addition, some of these observables will become sensitive to alpha_s, can constrain PDFs or reveal new physics.

Speaker: Mathieu Plamondon (University of Victoria)

Slides hard_QCD_8.pdf

13:00 Lunch

14:30 Afternoon Excursion and Concert

Thursday, 9 June

4A - B and top

46 Flavour Physics at the LHC (25' +5')

Speaker: Gilad Perez (Weizmann Institute)

Slides 01_Flavour_Physics_at_the_LHC.pdf

47 B physics from Tevatron (25' +5')

Speaker: Paola Squillacioti (University of Siena and INFN Pisa)

Paper proc_plhc11_Bphys_tevatron.pdf proc_plhc.zip

Slides PLHC_Bphysics.pdf

48 B decays, CKM, spectroscopy B and Charm at LHCb (40' +5')

The LHCb experiment has accumulated a sample of ~37 pb-1 of data during the 2010 run of LHC, at a center of mass energy of 7 TeV, and has already collected more than 150 pb-1 in the 2011 run. Results will be presented for heavy flavour production and decays in several modes. First measurements of the Bs mixing frequency and CPV phase, direct CP asymmetries and searches for new Physics in rare B decays will be also shown.

Speaker: Marta Calvi (Universita degli Studi Milano - Bicocca)

Paper Calviplenary.pdf

Slides 03_-_Calvi_Perugia.pdf

10:45 Coffee Break

4B - B and top

49 Top physics: theoretical aspects (25' +5')

Speaker: Eric Laenen (Fermi National Accelerator Laboratory (FNAL))

Slides 01-TopQuarkTheory.pdf

50 Top results from Tevatron (25' +5')

Speaker: Aran Garcia-Bellido (University of Rochester)

Slides AGB_topTEV.pdf

51 Top results from ATLAS (20' +5')

We present the most recent results on top quark physics using data collected with the ATLAS experiment. Results include the top pair production cross section in several channels, the search for single top production and searches for anomalous top quark production, and various measurements of top-quark properties such as the top quark mass and W polarization from top decay.

Speaker: Marina Cobal (INFN and University of Udine)

Paper cobal_plhc.zip

Slides 03_Top_PLHC2011_Atlas.pdf

52 Top results from CMS (20' +5')

We give an overview of the most recent results on top quark properties and interactions, obtained using data collected with the CMS experiment during the year 2010 at 7 TeV center-of-mass energy, and amounting to a total integrated luminosity of 36 pb-1. Results include the top pair production cross section, measured in both the dilepton and lepton+jets channels, the top quark mass, single top production, and top pair charge asymmetry. We also present measurements of the top pair invariant mass distribution and searches for new particles decaying to top pairs. All results are confronted with accurate standard model predictions.

Speaker: Alicia Calderon Tazon (IFCA - CSIC)

Paper PLHC11_Calderon.tar

Slides 04-PLHC_TopCMS_A_Calderon.pdf

13:05 Lunch

4C Parallel - B, charm and onia

53 Search for New Physics with rare decays of B and Bs mesons at LHCb (15' +5')

Rare decays of the B and Bs mesons are sensitive indirect probes of New Physics. In particular, the search for B(s) --> μ+μ– decays provides information on the presence of new (pseudo-)scalar particles, while the angular analysis of decays like B --> K*μ+μ– provides information on possible new vector-axial contributions. Furthermore radiative decays like Bs --> Φγ provide valuable information of New Physics modifying the photon polarization. LHCb is well suited for these analyses due to its large acceptance and trigger efficiency, as well as its excellent invariant mass resolution and particle identification capabilities. The status of these analyses with ~37 pb–1 of pp collisions collected by LHCb in 2010 at √s = 7 TeV is reviewed.

Speaker: Johannes Albrecht (CERN)

Paper JohannesAlbrecht_PLHC.pdf JohannesAlbrecht_PLHC.tex

Slides albrecht_final.pdf

54 Quarkonium Production at ATLAS (15' + 5')

The production of quarkonium is an important testing ground for QCD calculations. The fraction of J/\psi mesons produced from B-hadron decays was measured by the ATLAS experiment and the prompt and non-prompt differential J/\psi production cross-sections determined. The cross-section values extracted from data are compared to predictions from next-to-leading order QCD calculations. Results for heavier quarkonia will also be shown.

Speaker: Kendall Reeves (University of Texas at Dallas)

Slides 02-Quarkonium_Production_at_ATLAS.pdf

55 Signals of supersymmetry in flavour physics (20' + 5')

We discuss the characteristic signals of supersymmetric models in low energy observables that are sensitive to flavour and CP violation. We focus in particular on two of the golden channels at LHCb: the rare Bs - μ+μ− decay and CP violation in Bs mixing. We show the distinct predictions for the above flavour observables within several supersymmetric frameworks, including the MSSM with Minimal Flavour Violation, and outline how the characteristic patterns of New Physics effects allow to distinguish the different models from each other. Finally, we also briefly outline the role and the interplay of the direct NP searches at the LHC with the indirect searches performed by low energy flavour physics observables

Speaker: Wolfgang Altmannshofer (Fermilab)

Paper altmannshofer.pdf

Slides altmannshofer_PLHC11.pdf

56 Mixing and CP violation in the Bs system at LHCb (15' + 5')

The determination of the CP-violating phase Φs in Bs0 -> J/ Ψ Φ decays is one of the key goals of the LHCb experiment. Its value is predicted to be very small in the Standard Model but can be significantly enhanced in many models of new physics. To perform the first LHCb analysis of Φs on 2010 data at a centre-of-mass energy of 7 TeV, many milestones needed to be achieved first, such as the measurements of the b-hadron lifetimes, the optimization and calibration of the flavour-tagging algorithms, the measurement of the polarization amplitudes in B0 -> J/Ψ K*0 decays, of the Bs mixing frequency Δms and of the CP asymmetry in B0 -> J/Ψ KS. We will present our result of the first Φs analysis and related measurements. Additionally we will show signals of several Bs decay modes that have been observed for the first time at the LHCb experiment and which can potentially be used to extract information on Φs such as Bs0 -> J/Ψ f0 or Bs0 -> K*0 anti-K*0.

Speaker: Greig Cowan (EPFL)

Paper gcowan_plhc_phis.pdf

Slides gcowan_lhcb_phis.pdf

57 Measurements of quarkonia production and polarization with the CMS experiment (15'+ 5')

This talk presents the J/psi and psi(2S) differential cross sections and J/psi spin alignment in pp collisions at 7 TeV, as a function of transverse momentum and in several rapidity ranges, on the basis of the 2010 data collected by CMS. The B to J/psi and B to psi(2S) fractions will also be presented, and compared to other measurements as well as to theory calculations. We also report the measurement of the Υ(1S), Υ(2S), and Υ(3S) differential cross sections as a function of transverse momentum and rapidity. Finally, a measurement of the ratio of the production cross sections for X(3872) and ψ(2S) is presented.

Speaker: Hermine K. Woehri (CERN)

Paper PLHC2011_Perugia_HKWoehri_v1.pdf

Slides 05_Measurements_of_quarkonia_production_and_polarization_with_the_CMSexperiment.pdf

58 CP-violation measurements and prospects with hadronic B decays at LHCb (15'+ 5')

Using data collected by the LHCb detector during the 2010 run of the LHC we reconstruct the main charmless charged two-body b-hadron decay modes, namely B0--> pi+pi–, B0 --> K+pi–, Bs0 --> K+K–, Bs0 --> pi+K–, Lamdab --> pK– and Lamdab --> ppi–, and obtain first preliminary measurements of direct CP asymmetries. We also present studies of decays of the type B --> DX, where D is a charmed meson (D0, D(*)+ or Ds+), representing the first steps on a programme towards a precision measurement of the angle gamma of the CKM Unitarity Triangle. The prospects for CP violation results with hadronic B decays in the 2011 data will be reviewed.

Speaker: Lars Eklund (University of Glasgow)

Paper LHCb_CPinHadrDecay_Eklund.tar

Slides LarsEklund_PLHC_Perugia2011.pdf

4E Parallel - EWK and QCD

4E Parallel - EWK and QCD

59 Jet production in association with vector bosons at ATLAS (15' + 5')

We present detailed measurements of W or Z plus jet production, including multiplicities, jet transverse momentum and other differential cross sections. The cross sections for W+b-jets and Z+b-jets are also presented. The measurements are compared to NLO QCD predictions.

Speaker: Maria Fiascaris (University of Chicago)

Paper article.pdf WZJetsATLAS_Proceedings.tar

Slides PLHCWZjetsATLAS_Fiascaris.pdf

60 W,Z + jets production with CMS detector (15' + 5')

We present a study of jet production in association with W and Z bosons in pp collisions at a centre-of-mass energy of 7 TeV using 36 inverse-picobarns of data collected in the CMS experiment. The production of vector bosons with jets provides a stringent and important test of perturbative QCD calculations, and is an important background in searches for new physics and for studies of the top quark. We report the normalized jet multiplicity distributions as well as the ratios σ(V + (≥ n + 1)jets)/σ (V + (≥ n) jets) with a jet threshold of 30 GeV. We also present a measurement of the polarization of W bosons produced with large transverse momentum, establishing that W bosons produced in association with at least one hard jet are predominantly left-handed, as predicted by the Standard Model. Finally we report the observation of the production of the Z boson in association with at least one b-quark jet and a measurement of the fraction of b-jets over light-quark-jets in Z events.

Speaker: William Robert Reece (CERN)

Slides wreece_vjets.pdf

61 Role of gluons in soft and semi’hard hadron production in pp collisions at LHC (15' + 5')

Hadron inclusive spectra in pp collisions are analyzed within the soft QCD (SQCD), the quark-gluon string model, and the perturbative QCD (PQCD). It is shown that the SQCD results in the satisfactory description of the experimental data on the inclusive spectra of light hadrons like pions and kaons at transverse momenta Pt not larger than 1-2 GeV/c. We discuss some difficulties to apply the SQCD model at energies above the ISR and suggest to include the distribution of gluons in the proton unintegrated over the internal transverse momentum. It leads to an increase in the inclusive spectra of hadrons and allows us to extend the satisfactory description of the data in the central rapidity region at LHC energies. The comparison of our results with data at low Pt allows us to find the information on the unintegrated gluon distribution in proton.

Speaker: Gennady Lykasov (Joint Inst. for Nuclear Research (JINR))

Paper Lykasov_procPLHC11.pdf

proceedings LYKASOV_PLHC11_proc.zip

Slides BGLP_May27_11.ppt

62 QCD studies with photons in CMS (15' + 5')

We present QCD measurements with photons using data from pp collisions at sqrt(s)= 7 TeV, recorded with the CMS detector at the CERN LHC. The differential cross section for the inclusive production of isolated prompt photons as a function of the photon transverse energy and the inclusive di-photon production rate as a function of the di-photon invariant mass are compared to next-to-leading-order perturbative QCD calculations. Also, the photon+jet ratio of cross sections is presented, compared to Monte-Carlo generator predictions.

Speaker: Philippe Gras (CEA Saclay)

Slides plhc2011_pgras.pdf

63 Jet production measurement with the ATLAS detector (15' + 5')

Jet production is the hard QCD process with the widest kinematic reach and largest cross section at the LHC. Jets at large rapidity intervals, and jets which are not back-to-back, can also probe novel QCD evolution and radiation patterns. Comprehensive measurements of inclusive and dijet production are presented, as well as the production cross sections for jets containing beauty and charmed hadrons. The measurements are compared to state of-the art NLO QCD calculations, and the sensitivity to the parton distributions in the proton is also investigated.

Speaker: Felix Mueller (University of Heidelberg)

Paper PLHC_jets_fmueller_proc_final.pdf PLHC_jets_fmueller_proc.tgz

Slides PLHC_jets_fmueller.pdf

64 Measurements of WW, Wγ and Zγ production cross sections at CMS (15' + 5')

We present production cross-section measurements of diboson final states, WW, Wγ and Zγ, based on 36 inverse-picobarns of proton proton collisions data at √s = 7 TeV recorded at the LHC by the CMS detector. The electron and muon decay channels of the W and Z are used. For the W mode, we consider ee, e-mu and mu-mu final states. For the Wγ and Zγ modes, we measure the cross sections for the photon transverse energy ET(γ)>10 GeV and spatial separation from charged leptons ΔR(l,γ)>0.7. Our measurements are in agreement with standard model predictions. We also set the limits on anomalous WWγ, WWZ, ZZγ, and Zγγ trilinear gauge couplings at √s = 7 TeV.

Speaker: Armando Lanaro (University of Wisconsin Madison)

Slides lanaro-PLHC.pdf

16:30 Coffee Break

4D Parallel - B, charm and onia

65 Measurements of B production with the CMS experiment (15' + 5')

We present the measurements of b-quark production in inclusive channels and exclusive decays. The measurements are based on different methods, such as inclusive jet measurements with secondary vertex tagging or selecting a sample of events containing jets and at least one muon. In addition, measurements of B+, B0 and Bs meson production cross sections are presented. Finally, a study of the angular correlations between beauty and anti-beauty hadrons is presented, probing for the first time the small angular separation region.

Speaker: Polina Otiougova (University of Zurich)

Figure1 fig1.eps

Figure2 fig2.eps

Figure3 fig3.eps

Figure4 fig4.eps

proceeding_pdf proceeding_otiougova.pdf

proceeding_source proceeding_otiougova.tex

Slides Otiougova.pdf

66 Anomalous t-Wb couplings:interplay of t -Wb decays and B-Bbar mixing in MFV models (15' + 5')

Precise measurements of the top quark decay properties at hadron colliders offer interesting new possibilities of testing the standard model. At the same time, recent intriguing experimental results concerning CP violation in the Bd and Bs systems have stimulated many studies of physics beyond the standard model. We investigate anomalous tWdj interactions as a possible source of new effects in Bds – Bbar ds oscillations within a model independent approach based on the assumptions of Minimal Flavor Violation. After matching our effective operators onto the low-energy effective Lagrangian describing Bds meson mixing and evolving it down to the B-mass scale, we extract the preferred ranges of the anomalous tWdj interactions at the weak scale. These values are then compared to previously considered constraints coming from the rare radiative B Xs gamma decay. Finally, we reconsider the associated effects in the t - bW decays and find that the W helicity fractions FL+ can deviate by as much as 15%, 30% from their standard model values, respectively. The deviations in FL in particular, can reach the level of expected precision measurements at the LHC.

Speaker: Jure Drobnak (Jozef Stefan Institute)

Paper Drobnak_Perugia.pdf Drobnak_Perugia.zip

Slides anomaloustWb.pdf

67 CP-violation studies with charm decays at LHCb (15' + 5')

LHCb has reconstructed large samples of open charm events using 37 pb–1 of LHCb data collected in 2010. CP violation in charm is an excellent probe for New Physics due to the smallness of the Standard Model predictions. The analyses of D0 decays into two-body final states are presented, including time-dependent measurements of CP violation and mixing via the parameters AΓ and yCP and the measurement of the time-integrated CP asymmetry difference ΔACP = ACP(KK)–ACP(ππ). AΓ and ΔACP provide clean access to CP violation in box and penguin diagrams, respectively. Furthermore a model-independent search of CP violation in the Dalitz plot of D+ → K–K+π– is presented, using Ds+ → K–K+π– and D+ → K–π+π– as control channels. Prospects are given for improving the sensitivity of these measurements in the 2011–2012 run.

Speaker: Vladimir Gligorov (CERN)

proceedings_pdf article.pdf

proceedings_source PhysAtLHCProceedings_2011.tar.gz

Slides Charm4PhysicsAtLHC_v3.key.pdf

68 J/psi measurements in p-p and Pb-Pb collisions at LHC with ALICE (15' + 5')

In heavy ion collisions at the LHC, the ALICE experiment is studying nuclear matter at very high energy density where the formation of a Quark Gluon Plasma (QGP) is expected. J/ψ production is an important probe to characterize the properties of the QGP as it gives access to the early stages of the collision. However a fundamental understanding of the J/ψ production mechanism in p-p collisions is important to study the nuclear matter effects on J/ψ production in Pb-Pb collisions. In 2010 and 2011, the LHC provided p-p collisions at √s = 7 and 2.76 TeV and Pb Pb collisions at √s = 2.76 TeV per nucleon pair. We will report on the latest measurements of J/ψ production at mid-rapidity (in the dielectron channel) and at forward rapidity (in the dimuon channel).

Speaker: Cynthia Hadjidakis (INP and University Paris-sud)

Slides

• plhc2011.pdf
• plhc2011.tar
• PLHC_Cynthia.pdf

69 Open Bottom & Charm Production at ATLAS (15' + 5')

The production cross sections of the D*+-, D+- and Ds+- charm mesons have been measured with the ATLAS detector in pp collisions at sqrt{s}=7 TeV. The differential cross sections as a function of transverse momentum and pseudorapidity as well as the total cross sections are measured for D*+- and D+- production. Further production measurements of B and D hadrons will be presented.

Speaker: Miriam Watson (University of Birmingham, UK)

Paper MFWatson_PLHC.tgz MFWatson_proceedings.pdf

Slides plhc.pdf

70 Measurements of open heavy flavour production in p-p and Pb-Pb collisions with Alice (15' + 5')

The main goal of the ALICE experiment is the investigation of the properties of strongly-interacting matter in a very high density deconned state, that should be formed in Pb-Pb collisions. The measurement of the heavy avour production cross section in p-p collisions at the LHC will allow to test perturbative QCD calculations in a new energy regime. The p-p collisions data are also important as a reference for the study of dense matter eects in Pb-Pb collisions, where heavy quarks are expected to be sensitive probes for the QCD medium properties, as they are formed at shorter time scale than the medium itself. The nuclear modication factor (RAA), obtained by comparing p-p and Pb-Pb pT -dierential distributions, allows to measure the eect of in-medium energy loss. The status of open heavy avour measurements in p-p collisions at 7 TeV and Pb-Pb collisions at 2.76 TeV with the ALICE experiment will be presented. The results of the single lepton analyses (electrons at central rapidity, muons at forward rapidities) and D mesons reconstruction in their hadronic decays will be discussed.

Speaker: Davide Caffarri (INFN and University of Padova)

Paper DCaffarri_PLHC2011_proceedings.zip

Slides DCaffarri_PLHC2011.pdf

4F Parallel - top

71 Top quark pair production cross section measurements in the single- lepton and di-lepton channels with ATLAS (15' + 5')

We present a measurement of the top-quark pair-production in proton-proton collisions at = 7 TeV with the ATLAS detector at the Large Hadron Collider using the full 2010 data sample. The cross sections are measured in the lepton+jets and dilepton channels both with and without the use of b-tagging

Speaker: Adam Roe (Goettingen University)

Paper roe_ttxsec_article.pdf roe_ttxsec_article.tar

Slides toppair_xsec_roe_PLHC.pdf

72 Top quark cross section measurements with CMS (15' + 5')

We present precise measurements of the top quark pair production cross section at 7 TeV, performed using CMS data collected in 2010-2011. The total cross section is measured in the lepton+jets, dilepton and fully hadronic channels, including the tau-dilepton and tau+jets modes. The results are combined and confronted with precise theory calculations. We also obtain an indirect constraint on the top quark mass through its relation to the cross section. Various differential cross sections are measured as well and compared with theoretical models. Measurements of the top pair invariant mass distribution are used to search for new particles decaying to top pairs. Further results include measurements of the top pair charge asymmetry.

Speaker: Haryo Sumowidagdo (University of California, Riverside)

Paper PLHC_Sumowidagdo.pdf sumowidagdo.tar

Slides PLHC2011_Sumowidagdo.pdf

73 The third generation quark sector in warped models LHC predictions from LEP/Tevatron anomalies (15' + 5')

Since a decade, there have been extensive developments about an alternative to super- symmetry: the scenarios with warped extra dimensions. Those constitute a new paradigm in the sense that they are dual, through the AdS/CFT correspondence, to composite Higgs models. These scenarios predict strong deviations from the Standard Model mainly in the bottom and top quark sector. In that sense, the LEP anomaly on Forward-Backward bottom asymmetry (Ab FB) and the recent Tevatron anomalies on the top asymmetry At FB could be interpreted as early signatures of the warped models. We will discuss warped model real- izations allowing to explain both Ab FB and At FB, taking into account the constraints issued from dijet production rates at LHC. The other constraints from the measurements of top pair production cross section _ttbar at LHC will be studied. Then, I will describe what are the predictions of these warped models at LHC, pointing out the complementarity between Tevatron and LHC on top physics (I will also mention the possibilities for measuring top asymmetries at LHC). There are typically two types of predicted signatures at LHC: a resonance peak in the t tbar invariant mass distribution (due to the exchange of a Kaluza-Klein excitation of the gluon) or the production of exotic colored fermions around a few hundred's of GeV. The results presented here are based on our works in Ref. [1], Ref. [2] and Ref. [3]. [1] A. Djouadi, G. Moreau and F. Richard, Nucl. Phys. B773 (2007) 43, hep-ph/0610173. [2] A. Djouadi, G. Moreau, F. Richard and R. K. Singh, Phys. Rev. D82 (2010) 071702, arXiv:0906.0604 [hep-ph]. [3] A. Djouadi, G. Moreau and F. Richard, arXiv:1105.3158 [hep-ph].

Speaker: Gregory Moreau (LPT Orsay)

Paper plhc-moreau.pdf plhc-moreau.tgz

Slides PLHC-Moreau.pdf

74 Searches for Single Top-Quark Production with the ATLAS Detector in pp Collisions at sqrt(s) = 7 TeV (15' + 5')

We present the result of searches for single top-quark production in the t- and Wt-channels in 7 TeV proton-proton collisions with the ATLAS detector using the full 2010 data sample. The t-channel search is based on the selection of events with a single lepton (muon or electron), jets and missing transverse energy. A likelihood function approach is also used to cross-check the result. Results are consistent with the Standard Model expectation. The Wt-channel analysis isbased on the selection of events with one or two leptons, jets and missing transverse energy. A 95% confidence level limit is set on the Wt-channel production cross section of sigma(Wt).

Speaker: Reinhard Schwienhorst (Michigan State University)

Paper singletopATLAS.pdf singletopATLAS.tgz

Slides SingletoppLHC2011.pdf

75 Single top quark production with CMS (15' + 5')

We present measurements of single top quark production, performed using CMS data collected in 2010-2011 at a centre-of-mass energy of 7 TeV. The cross section for the electroweak production of single top quarks is measured in the t-channel using various methods. The combined result is used to place a constraint on the CKM matrix element Vtb. The data sample analyzed allows to study also differential distributions. For the first time, we measure single top production in the tW channel.

Speaker: Mara Senghi Soares (CIEMAT Madrid)

Slides 05-PerugiaSoares.pdf maraPerugiaProc.pdf

76 Top quark property measurements at ATLAS (15' + 5')

We present result on the direct measurement of the top quark mass in the lepton+jets channel, and an ndirect measurement of the top quark mass from the top quark pair production cross section. We also present a measurement of the W boson polarisation in top quark decays and set limits on anomalous contributions to the Wtb vertex. All data were collected from proton-proton collisions at sqrt(s)=7 TeV, recorded with the ATLAS detector during 2010.

Speaker: Valerio Dao (University of Geneve)

Paper DaoProceedingsPLHC.pdf Dao-ProceedingsPLHC.zip

Slides TopProperties_DAO_PLHC_2.pdf

77 Top quark mass and other properties measurements with CMS (15' + 5')

We present measurements of the top quark mass and other properties, obtained from CMS data collected in 2010-2011 at a centre-of-mass energy of 7 TeV. The mass of the top quark is measured using several methods. We use the lepton+jets, as well as the dilepton and the fully hadronic decay channels. The results are combined. Top pair production cross section measurements are used to place an indirect constraint on the top quark mass through the predicted dependence of the cross section on the mass. Further results include measurements of the W helicity in top decays and search for anomalous couplings.

Speaker: Thomas Speer (Brown University)

Paper proceedings_speer.tar

Slides 110609_PLHC_speer.pdf

Friday, 10 June

5A - Higgs and BSM

78 How weak is electroweak ? Probing strong EWSB at the LHC (30'+5')

Speaker: Roberto Contino (Sapienza University of Rome)

Slides pLHC_contino.pdf

79 Higgs results from Tevatron (20' +5')

Speaker: Massimo Casarsa (Fermi National Accelerator Laboratory)

Paper casarsa.pdf casarsa.tgz

Slides casarsa.pdf

80 Higgs results from CMS (20' +5')

We report on the various SM and BSM Higgs Boson searches conducted by the CMS experiment with the 2010 data. Projected CMS sensitivity to SM Higgs Boson searches at sqrt(s) = 7 TeV under various luminosity scenarios will also be described.

Speaker: Marcello Mannelli (CERN)

Slides Marcello_CMS_Higgs_Perugia_June_2011.pdf

81 Recent Higgs results from ATLAS (20' +5')

In the context of the Standard Model and of scenarios beyond the Standard Model, results of Higgs boson searches of the ATLAS experiment are presented for 2010 and 2011 data. Combination of the Standard Model Higgs decay channels is shown for the 2010 data.

Speaker: Marc Escalier (University Paris-sud)

Paper ProcEscalier.tar

Slides escalier_final_plhc2011.pdf

10:50 Coffee Break

5B - Higgs and BSM

82 The quest for new physics at the weak scale (30' +5')

Speaker: Carlos E.M. Wagner (University of Chicago and ANL)

Slides 01-WagnerPerugia11.pdf

83 Searches in CMS (25' +5')

We discuss the results of searches for various new physics phenomena, including supersymmetry, in pp collisions at 7 TeV delivered by the LHC and collected with the CMS detector. These results demonstrate a good understanding of the detector and backgrounds in a variety of channels and in many cases they set the most stringent limits on these new physics phenomena, surpassing previous experiments.

Speaker: Lars Sonnenschein (RWTH Aachen)

Paper CMSsearches_Lars.Sonnenschein_PLHC2011.pdf

Slides CMSsearches_Lars.Sonnenschein.pdf

84 Recent results from New Physics Searches in ATLAS (25' +5')

The Large Hadron Collider provides an exceptional opportunity to test the validity of the Standard Model at the TeV scale where new phenomena are considered likely to be found. We present a review of new physics searches including searches for supersymmetry in pp collisions at 7 TeV using the ATLAS detector. Particular emphasis will be given to most recent results, including those obtained with 2011 data.

Speaker: Tommaso Lari (INFN Milano)

Paper article.pdf procPerugia.tar.gz

Slides PerugiaPLHC11.pdf

13:00 Lunch

5C Parallel - Higgs and Susy

85 ATLAS Higgs results (15' + 5')

First results from ATLAS on Higgs searches in the 2011 data are reported. Overview of the results will be given for several decays modes of the SM Higgs boson.

Speaker: Yingchun Zhu (Department of Physics-University of Wisconsin)

Proceeding article.pdf

Slides PLHC-Higgs.pdf

tarball of proceeding proceeding.tar

86 Higgs Searches at CMS (15' + 5')

We report on the various SM and BSM Higgs Boson searches conducted by the CMS experiment with the 2010 data. Projected CMS sensitivity to SM Higgs Boson searches at sqrt(s) = 7 TeV under various luminosity scenarios will also be described.

Speaker: Ashok Kumar (University of Delhi)

Paper kumar-ashok_Higgs_CMS_PLHC.pdf

Proceeding PLHC.tar

Slides ashok-higgs-cms-plhc2011.ppt

87 Higgs phenomenology beyond the SM (20' + 5')

Detection of a signal in one of the standard LHC Higgs search modes does not guarantee that the particle discovered is the Standard Model Higgs. I'll survey some general classes of alternatives and ways to tell them apart.

Speaker: Heather LOGAN (Carleton U.)

Paper plhc-logan.pdf plhc-logan.tar.gz

Slides bsmhiggs.pdf

88 Overview of ATLAS Supersymmetry searches with 2010 LHC data (15' + 5')

ATLAS searches for supersymmetry in data from the 2010 run of the LHC, corresponding to an integrated luminosity of 35 pb-1, will be reviewed. These searches were performed in various channels containing different lepton and jet multiplicities in the final state (with and without missing transverse momentum). Searches for semi-stable particles will also be covered.

Speaker: Troels Petersen (Niels Bohr Institute Copenhagen)

Slides PLHC_June2011_SUSYoverview_V2.0.pdf

5E Parallel - BSM

89 Searches for new particles decaying into jet pairs in 2011 ATLAS data (15' + 5')

First results from the ATLAS searches for new particles decaying into dijet final states in the 2011 data are reported. An overview of the results will be given.

Speaker: Ryan Mark Buckingham (Particle Physics-University of Oxford)

Paper ATL-PHYS-PROC-2011-132.pdf

Slides PLHC2011.pdf

90 Search for hadronic resonances at CMS (15' + 5')

We present the results of searches for new heavy resonances in dijet, ttbar, and multijet hadronic final states in the pp collisions at 7 TeV delivered by LHC and collected with the CMS detector in 2010. No excess of events above the standard model predictions has been found.

Speaker: Sertac Ozturk (University of Iowa)

Paper PLHC_Proceding_Ozturk.pdf Proceding_Ozturk.zip

Slides PLHC2011_Ozturk.pdf

91 What if SUSY is not right? Non-susy signals at the LHC (20' + 5')

I will summarize several of the signals that appear in NON supersymmetric models beyond the SM, like Z', extra-dimensions, little or composite Higgs and models without a Higgs.

Speaker: Antonio Delgado (University of Notre Dame)

Paper article.pdf article.tex

Slides plhc.pdf

92 Tevatron BSM results (15' + 5')

Speaker: Gerard Sajot (University of Grenoble)

Paper PLHC2011_proceeding_material.zip Proceedings_PLHC2011_G.SAJOT.pdf

Slides BSM_Perugia_G.Sajot_08-06-11.pdf

16:00 Coffee Break

5D Parallel - Higgs and Susy

93 Search for SUSY in jets plus missing transverse momentum final states with the ATLAS (15' + 5')

The most sensitive channels to Supersymmetry in proton-proton collisions are composed of jets and missing transverse momentum finalstates. The most recent results on these channels will be given based on data recordedin 2011.

Speaker: Michael Rammensee (Albert-Ludwigs-Universitaet Freiburg)

Paper PLC2011Proceedings.pdf

Slides PLHC2011mrammensSUSY.pdf

tarball of Proceedings mrammensProceedingsPLHC2011.tar.gz

94 Search for SUSY at CMS in all-hadronic final states (15' + 5')

A search for new physics is presented based on an event signature of at least three jets accompanied by large missing transverse momentum using a data sample of 36 pb^-1 of proton–proton collisions at sqrt(s) = 7 TeV acquired by the CMS detector at the LHC in 2010. There are three main background components. One is irreducible, from Z+jets events, with the Z decaying to neutrinos. A second comes from W+jets and top events where W decay yields a lepton that is not identified or a tau that decays hadronically. The third arises from QCD multi-jets where the missing momentum originates from jet mis-measurements, heavy-flavour decays, or instrumental effects. All these backgrounds are estimated from the data. No excess of events over backgrounds is observed. Exclusion limits are presented for the Constrained Minimal Supersymmetric extension of the Standard Model (CMSSM). Cross section limits are also presented using simplified models with generic particles decaying to one or two jets and an undetected particle.

Speaker: Piet Verwilligen (Universiteit Gent)

Paper PLHC_PietVerwilligen.pdf PLHC_PietVerwilligen.tar.gz

Slides Perugia.pdf

95 Exploring Yukawa and Gauge-Yukawa Unification at the LHC (15' + 5')

Third family (t-b-tau) Yukawa unification is predicted in a class of grand unified models based on SO(10) as well as its subgroup H = SU(4) x SU(2) x S (2). This can lead to some surprising conclusions for the low energy MSSM phenomenology. For instance, in SO(10) the gluino turns out to be the lightest colored sparticle, while the gauge symmetry H can yield a gluino NLSP scenario. A search for NLSP gluino at the LHC involving multi-b final states will be discussed. Gauge-Yukawa unification can arise from higher dimensional unified theories, yields several interesting low energy scenarios including gluino NLSP, and it will be tested at the LHC following a precise determination of the top mass.

Speaker: Qaisar Shafi (Bartol research Institute, University of Delaware)

Slides PLHC11QShafi.pdf

96 Search for Higgs Bosons in SUSY Cascade Decays and Neutralino Dark Matter (15' + 5')

We study the possibility of observing at the LHC Higgs bosons produced from supersymmetric decay chains in the regions of parameter space consistent with a neutralino dark matter relic density. We analyze the dependence on the non- standard Higgs boson, slepton and squark masses, as well as on the condition of gaugino mass unification. In general, we conclude that, provided sleptons are heavier than the second lightest neutralino, the presence of (boosted) Higgs is a common MSSM feature, implying excellent prospects for observation of the light MSSM Higgs boson in the near future.

Speaker: Stefania Gori (University of Chicago)

Paper proceedings1.pdf

Slides PerugiaTalk2.pdf

97 Search for SUSY at CMS in leptonic final states (15' + 5')

We present results of searches for Supersymmetry in signatures involving one or more leptons. These searches are performed with data collected by the CMS experiment at the LHC in pp-collisions at a center of mass energy of 7 TeV. Various data driven techniques used to measure the Standard Model background are demonstrated. The results are interpreted within the CMSSM as well as more general, simplified models.

Speaker: Didar Dobur (University of Florida)

Slides 05-SUSY_PLHC_Dobur.pdf 05-SUSY_PLHC_Dobur.pptx

98 New results from ATLAS supersymmetry searches with 2010 data (15' + 5')

This talk presents the latest searches for signals of Supersymmetry in the data collected in 2010 by the ATLAS experiment in LHC collisions at a centre-of-mass energy of 7 TeV. The first study looks for a signal in the di-photon plus large missing energy final state while the second is a search, based on the muon spectrometer, for long-lived stable massive particles No excess was observed and limits, most stringent to date, are set in both cases.

Speaker: Simon Owen (University of Sheffield)

Slides pLHC_2011.pdf

5F Parallel - BSM

99 Searches for new heavy gauges bosons in 2011 ATLAS data (15' + 5')

Many extensions of the Standard Model predict the existence of additional, heavy gauge bosons. The ATLAS detector is used to search for high-mass states, such as charged and neutral heavy gauge bosons, (W',Z’) decaying to a charged lepton (electron or muon) and a neutrino or into two leptons, respectively in the 2011 data.

Speaker: Dominick John Olivito (University of Pennsylvania)

Paper ATL-PHYS-PROC-2011-153.pdf

Slides olivito_wzprime_plhc2011.v7.pdf

100 Search for leptonic resonances at CMS (15' + 5')

We present the results of searches for excited leptons and new heavy gauge bosons in leptonic final states in the pp collisions at 7 TeV delivered by LHC and collected with the CMS detector in 2010. No excess of events above the standard model predictions has been found.

Speaker: Carmen Diez Pardos (CIEMAT Madrid)

Paper CDiezProceedig_PLHC.pdf CDiezProceeding.tar.gz

Slides LeptonicSearches_CDiez.pdf

101 The top forward-backward asymmetry and the LHC (15' + 5')

The long-standing Tevatron anomaly in the top forward-backward asymmetry has been the focus of a recent wave of model building. I will discuss models which account for the asymmetry and the prospects for related measurements at the LHC in both the short- and long-term. Two strategies for measuring related asymmetries at the LHC will be detailed, with large beyond-the-standard-model asymmetries observable in $\sim 5$ ifb at the 7 TeV LHC and the small SM asymmetry observable at the 14 TeV LHC.

Speaker: Jessie Shelton (Yale University)

Paper plhc-shelton.pdf

Slides 110610-Perugia.pdf

102 Search for Large Extra Dimensions at CMS (15' + 5')

We present the results of a search for large extra spatial dimensions with the pp collisions at 7 TeV collected with CMS in 2010. No excess of events above the standard model predictions has been found. Limits are set on the effective Planck scale.

Speaker: Ka Vang Tsang (Department of Physics - Brown University)

Slides PLHC_2011.pdf

103 Searches for ttbar resonances in 2011 ATLAS data (15' + 5')

Many models beyond the standard model predict that new particles decaying into final states with top quarks. The ATLAS search results for top quark pair resonances in the 2011 data are reported.

Speaker: Diane Cinca (LPC Clermont-F.)

Paper cinca.pdf PLHC_cinca.tar

Slides Perugia_Cinca_ttbar.pdf

104 Search for leptoquarks and heavy quarks at CMS (15' + 5')

We present the results of searches for pair-production of leptoquarks and bottom-like fourth generation quark b′ in pp collisions at 7 TeV collected with CMS in 2010. No excess of events above the standard model predictions has been found. Limits are set on the production cross section, some of which are the most stringent to date.

Speaker: Anne-Fleur Barfuss (Kansas State University)

Slides Leptoquarks_AFB_PLHC_10June2011.pdf

19:30 Conference Dinner

Buses will leave in front of Hotel Gio Wine Parking at 19:oo for the Conference Dinner at the Locanda dei golosi.

Saturday, 11 June

6A - Looking ahead and closing

105 Study of the dijet invariant mass distribution in ppbar->W + jj final states at D0 (15'+5')

Speaker: Aran Garcia-Bellido (University of Rochester)

Slides 01_-_D0_Wjj_PLHC.pdf

106 Cosmology and LHC (30'+5')

Speaker: Neal Weiner (NYU)

Slides 02_-_weiner_plhc.pdf

107 Flavour Physics at LHC and B factories (30' + 5')

Speaker: Tatsuya Nakada (EPFL)

Slides 03-PLHC_Nakada.pdf

10:30 Coffee Break

6B - Looking ahead and closing

108 Experimental Summary and outlook (40' + 5')

Speaker: Jim Virdee (Imperial College)

Slides PLHC_Perugia-Virdee.pdf PLHC_Perugia-Virdee.ppt

109 Theoretical overview (40' +5')

Speaker: Riccardo Barbieri (INFN and SNS Pisa)

Slides 02-barbieri.pdf

110 Presentation of next venue

Speaker: Michel Lefebvre (University of Victoria)

Slides VancouverPLHC.pdf

111 Farewell

Speaker: Guenakh Mitselmakher (University of Florida)

Slides 04_-_PLHCfarewell.pdf 04_-_PLHCfarewell.pptx

13:00 Lunch

14:30 Departure