1 / 16

Contribution of HMPID Detector to High-pT Physics at LHC: HBT Measurement Insights

This report discusses the contributions of the HMPID detector to high-pT physics measurements at the LHC, focusing on the Hanbury-Brown and Twiss (HBT) interferometric methods for analyzing final-state information in heavy-ion collisions. We explore the required particle identification for event-by-event HBT, highlighting the significance of achieving 3σ separation. The report also covers the historical context of HBT applications in particle physics, analysis concepts, and future outlooks, including ongoing studies and statistics from previous LHC runs.

ryder
Download Presentation

Contribution of HMPID Detector to High-pT Physics at LHC: HBT Measurement Insights

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. K±K± HBT Study with HMPID- Status Report - Jungyu Yi Pusan National University Ko-ALICE meeting

  2. Motivation Historical review HMPID Contribution of the HMPID detector to the high-pT physics at LHC[D.Di Bari et al. arXiv:0801.2695v1, 2008] “ Final-state information of heavy-ion collisions is more directly accessed by interferometric methods, such as the Hanbury-Brown and Twiss (HBT) measurement.” “At LHC, due to the high multiplicity, event-by-event HBT could be performed. To achieve event- by-event HBT measurements, 3σ separation in particle identification is required. The HMPID can contribute in the high-pT region: to π±π±, K±K± and p±p± HBT measurements. • In 1950s, Hanbury-Brown & Twiss • For Improving of Resolution Power of Michelson Interferometry: [Phil.Mag.45, 663 (1954)] • Astronomical Application :[Nature 178, 1046 (1956)]A Test of a New Type of StellarInterferometer on Sirius • Particle Physics application • G. Goldhaber, S. Goldhaber, W. Lee, & A. Pais : [Phys.Rev.120,300 (1960)] Influence of Bose-Einstein Statistics on the Antiproton-Proton Annihilation Process • GGLP : Bose-Einstein Correlation Ko-ALICE meeting, 20130205

  3. AnalysisConcept The correlation function for Gaussian source (1D parameterization ) (3D parameterization ) ~ 1/R Bose-Einstein correlation (: transverse momentum) Rside :related geometrical transverse size Rlong : related longitudinal extent Rout :related to emission duration Compares relative momenta of identical particles to determine information about space-time geometry of source for analysis, A (q) : pair distribution in momentum difference q = p2 – p1for pairs of particles from the same event.B (q) : the corresponding distribution for pairs of particles from different events. Ko-ALICE meeting, 20130205

  4. HMPID layout p and K up to 3 GeV/c p up to 5 GeV/c, track-by-track basis. ~ 5% acceptance w.r.t Central barrel detectors Ko-ALICE meeting, 20130205

  5. HMPID Analysis task AliHMPIDAnalysisTask.cxx/.h includes, • AliESDtrack.h • AliPID.h • AliCentrality.h • AliPIDResponse.h • Tree • TreeEvt run ‘AnalysisTrainHMPID.C’ includes, • AddTaskPhysicsSelection.C • AddTaskCentrality.C • AddTaskESDFilter.C • AddTaskJets.C • AddTaskPIDResponse.C • AddTaskHMPID.C for event Ko-ALICE meeting, 20130205

  6. hmpidouput.root :: HMP X,Y • Aliroot::v5-03-57-AN • LHC11h pass2 • example : run_169504, events: 145654 • There was problems in HMPID • Module 1 , 4, 6 • It’s known, can affect the acceptance Ko-ALICE meeting, 20130205

  7. Cherenkov Angle vs. momentum AliPID::kElectron, Prob0>0.7 AliPID::kMuon, Prob1>0.7 AliPID::kProton, Prob4>0.7 AliPID::kKaon, Prob3>0.7 AliPID::kPion, Prob2>0.7 Ko-ALICE meeting, 20130205

  8. Total and Kaon Multiplicity : e-by-e • track->GetNcls(1) >70 • DCA < 2 [cm] • MIP charge > 100 • track->GetNcls(1) >70 • DCA < 2 [cm] • MIP charge > 100 • && probsHMP[3]>0.7 Ko-ALICE meeting, 20130205

  9. Outlook • Kaon PID with HMPID in PbPb √sNN = 2.76 TeV • HMPID framework study : partially done • HMPID Track/PID quality study for PbPb • At least 1 Kaon track : for bkg. , event mixing • At least 2 Kaon track : for Signal • Analysis algorithms, Code development • correlation signal construction • event mixing • PWGCF - femtoscopy framework study • Goal • Preliminary ‘Correlation function (qinv)’ in this winter. • Welcome advice, comments, suggestions!! Ko-ALICE meeting, 20130205

  10. Backup Ko-ALICE meeting, 20130205

  11. p1 r1 r1‘ r2 p2 r2‘ 1 {Yd + Yc} = eij(r1)eij(r2)F(p1p2:r1r2 r1‘r2‘) 2 P(p1,p2) = dr1dr2r(r1)r(r2)|F|2 = P(p1)P(p2) + | dreiqrr(r)A2(K,r)|2 2 P(p1,p2) drS(K,r)eiqr 2 P(p1)P(p2) drS(K,r) Bose-Einstein Correlation (1) A(p1,r1)eij(r1)eip1(r1-r‘1)A(p2,r2)eij(r2)eip2(r2-r‘2) = Yd A(p1,r2)eij(r2)eip1(r2-r‘1)A(p2,r1)eij(r1)eip2(r1-r‘2) = Yc q = p1 - p2 K= 0.5(p1 + p2) ; r = r1 - r2 Bose-Einstein Correlation Function C2 = = 1+ Ko-ALICE meeting, 20130205

  12. Identical kaons pairs yield in HMPID acceptance in PbPbdata Total identical pions pairs = 800 *106 in 60*106 p-p 7 TeV MB events 0.13 GeV/c < KT < 0.7 GeV/c Ko-ALICE meeting, 20130205

  13. Identical kaons pairs yield in HMPID acceptance in PbPbdata Ko-ALICE meeting, 20130205

  14. Total statistic collected up to now • 2010 • pp 7 TeV, LHC10b and LHC10c (pass3): ≈ 80* millions of MB events, new tracking; • pp7 TeV, LHC10d (pass2): ≈ 200 millions of events, old tracking; • pp 7 TeV, LHC10e (pass2): ≈ 200 millions of events, old tracking; • PbPb 2.76 ATeV, LHC10h (pass2): ≈ 10* millions of MB events , old tracking; • 2011 • pp 2.76 TeV, LHC11a (pass3): ≈ 50* millions of MB events, new tracking; • pp 7 TeV, LHC11b (pass1): ≈ 50 millions of events, old tracking; • pp 7 TeVLHC11c (pass1): ≈ 100 millions of events, half old tracking, half new tracking; • pp 7 TeVLHC11d (pass1): ≈ 20 millions of events, new tracking; Ko-ALICE meeting, 20130205

  15. Total statistic collected up to now • 2011 • pp 7 TeV, LHC11e (pass1): ≈ 40 millions of events, new tracking; • PbPb 2.76 ATeV, LHC11h: ≈ 10* millions of central events, ≈ 10 millions of semi-central events, few millions of MB events, new tracking. • 2012 (MB events fraction rather small) • pp 8 TeV, LHC12a (pass1): ≈ 50 millions of events, new tracking; • pp8 TeV, LHC12b (pass1): ≈ 70 millions of events, new tracking; • pp8 TeV, LHC12c (cpass1): ≈ 30 millions of events, new tracking; • pp8 TeV, LHC12d (pass1): ≈ 30 millions of events, new tracking; • pp8 TeV, LHC12f (pass1): ≈ 10 millions of events, new tracking; • pp8 TeV, LHC12g and LHC12h (cpass1): ≈ 6 millions if events, new tracking; • …………………………………………………? Ko-ALICE meeting, 20130205

  16. Total statistic collected up to now • Total p-p 8 TeV MB events: ≈ 20*106? • Total p-p 7 TeV MB events: ≈ 800*106 • Total p-p 2.76 TeV MB events: ≈ 50*106 • Total Pb-Pb 2.76 ATeV events: 10*106 MB, 10*106 central (0-10%), 10*106 semi central (10-50%) Ko-ALICE meeting, 20130205

More Related