2012/7/231 Cosmic Ray at STAR Shuai Yang Center of Particle Physics and Technology University of Science and Technology of China STAR Regional Meeting.

Slides:

Advertisements

Similar presentations

CBM Calorimeter System CBM collaboration meeting, October 2008 I.Korolko(ITEP, Moscow)

Advertisements

ISS meeting UCIrvine 21 August 2006 Alain Blondel 1 Evaluation of « optimal » segmentation for neutrino factory far detectors A. magnetized iron sampling.

Status of DHCAL Slice Test Data Analysis Lei Xia ANL-HEP All results preliminary.

1 Search for the Flavor-Changing Neutral-Current Decay,   → p     HyangKyu Park University of Michigan, Ann Arbor for the HyperCP collaboration.

PHENIX Decadal Plan o Midterm upgrades until 2015 o Long term evolution after 2015 Dynamical origins of spin- dependent interactions New probes of longitudinal.

Cosmic Rays with the LEP detectors Charles Timmermans University of Nijmegen.

14 Sept 2004 D.Dedovich Tau041 Measurement of Tau hadronic branching ratios in DELPHI experiment at LEP Dima Dedovich (Dubna) DELPHI Collaboration E.Phys.J.

M.Mevius Open and hidden beauty production in 920 GeV proton –nucleus collisions at HERA-B M.Mevius DESY.

1 N. Davidson E/p single hadron energy scale check with minimum bias events Jet Note 8 Meeting 15 th May 2007.

Winter Workshop on Nuclear Dynamics, Heavy Ion Physics with CMS: Day-One Measurements Olga Barannikova for the CMS Collaboration.

LMD study Anselmo Cervera Villanueva Université de Genève ISS teleconference 8/12/2005.

Status of  b Scan Jianchun Wang Syracuse University Representing L b scanners CLEO Meeting 05/11/02.

1 Hadronic In-Situ Calibration of the ATLAS Detector N. Davidson The University of Melbourne.

1 The CMS Heavy Ion Program Michael Murray Kansas.

In order to acquire the full physics potential of the LHC, the ATLAS electromagnetic calorimeter must be able to efficiently identify photons and electrons.

GLAST LAT Project Test Beam Meeting, June 6, 2006 S. Funk 1/6 PS Positron Simulations Stefan Funk June 6, 2006.

JSPS Research Fellow / University of Tsukuba T. Horaguchi Oct for HAWAII /10/15HAWAII

HLab meeting 10/14/08 K. Shirotori. Contents SksMinus status –SKS magnet trouble –Magnetic field study.

EHE Search for EHE neutrinos with the IceCube detector Aya Ishihara for the IceCube collaboration Chiba University.

C B M Di-electron background studies and first results using compact RICH CBM Collaboration Meeting, 27 September 2007, Dresden Di-electron background.

Di-electron pair reconstruction CBM Collaboration Meeting, 28 February 2008, GSI-Darmstadt Di-electron pair reconstruction Tetyana Galatyuk GSI-Darmstadt.

Current Status of Hadron Analysis Introduction Hadron PID by PHENIX-TOF  Current status of charged hadron PID  CGL and track projection point on TOF.

MdcPatRec Tracking Status Zhang Yao, Zhang Xueyao Shandong University.

Irakli Chakaberia Final Examination April 28, 2014.

1 MTD Calibration for Cosmic Ray Triggered Data in RUN 10 at STAR Lijuan Ruan (BNL), Liang Li (UT Austin) 04/01/ Workshop on STAR MTD Production.

NA48-2 new results on Charged Semileptonic decays Anne Dabrowski Northwestern University Kaon 2005 Workshop 14 June 2005.

Preliminary MC study on the GRAND prototype scintillator array Feng Zhaoyang Institute of High Energy Physics, CAS, China GRAND Workshop, Paris, Feb. 015.

March 02, Shahid Hussain for the ICECUBE collaboration University of Delaware, USA.

XXXI International Cosmic Ray Conference, ICRC 2009 Lodz, Poland, July 7-15, 2009 Time structure of the Extensive Air Shower front with the ARGO-YBJ experiment.

Detector Monte-Carlo ● Goal: Develop software tools to: – Model detector performance – Study background issues – Calculate event rates – Determine feasibility.

1 Performance of a Magnetised Scintillating Detector for a Neutrino Factory Scoping Study Meeting Rutherford Appleton Lab Tuesday 25 th April 2006 M. Ellis.

Study of exclusive radiative B decays with LHCb Galina Pakhlova, (ITEP, Moscow) for LHCb collaboration Advanced Study Institute “Physics at LHC”, LHC Praha-2003,

Year -2 topics simulations needs for these Barbara Jacak March 2, 2001.

FTPC status and results Summary of last data taken AuAu and dAu calibration : Data Quality Physic results with AuAu data –Spectra –Flow Physic results.

W/Z Plan For Winter Conferences Tom Diehl Saclay 12/2001.

Non-photonic electron production in p+p collisions at √s=200 GeV Xiaozhi Bai for the STAR collaboration Central China Normal University University of Illinois.

Muon detection in NA60  Experiment setup and operation principle  Coping with background R.Shahoyan, IST (Lisbon)

1 Occupancy, Rate Effects & Combinatorial Background By Rusty Towell January 8, 2009.

D 0 reconstruction: 15 AGeV – 25 AGeV – 35 AGeV M.Deveaux, C.Dritsa, F.Rami IPHC Strasbourg / GSI Darmstadt Outline Motivation Simulation Tools Results.

CP violation in B decays: prospects for LHCb Werner Ruckstuhl, NIKHEF, 3 July 1998.

BESIII Track Extrapolation & Matching Wang Liangliang EPC IHEP.

Study of J/  ->e + e - in d-Au Collision with Electron Triggers in PHENIX W. Xie (UC. Riverside) PHENIX Collaboration April APS in 2003.

The Detector Performance Study for the Barrel Section of the ATLAS Semiconductor Tracker (SCT) with Cosmic Rays Yoshikazu Nagai (Univ. of Tsukuba) For.

1 Performance of a Magnetised Scintillating Detector for a Neutrino Factory Scoping Study Meeting U.C. Irvine Monday 21 st August 2006 M. Ellis & A. Bross.

4/12/05 -Xiaojian Zhang, 1 UIUC paper review Introduction to Bc Event selection The blind analysis The final result The systematic error.

January 13, 2004A. Cherlin1 Preliminary results from the 2000 run of CERES on low-mass e + e - pair production in Pb-Au collisions at 158 A GeV A. Cherlin.

Performances of the KM2A prototype array J.Liu for the LHAASO Collaboration Institute of High Energy Physics, CAS 32nd International Cosmic Ray Conference,

J/ψ simulations: background studies and first results using a compact RICH detector Alla Maevskaya INR RAS Moscow CBM Collaboration meeting September 2007.

Tau31 Tracking Efficiency at BaBar Ian Nugent UNIVERSITY OF VICTORIA Sept 2005 Outline Introduction  Decays Efficiency Charge Asymmetry Pt Dependence.

Jet Production in Au+Au Collisions at STAR Alexander Schmah for the STAR Collaboration Lawrence Berkeley National Lab Hard Probes 2015 in Montreal/Canada.

Physics whit ACORDE (ALICE Cosmic ray detector) Arturo Fernández for ACORDE-ALICE group.

 reconstruction and identification in CMS A.Nikitenko, Imperial College. LHC Days in Split 1.

Open and Hidden Beauty Production in 920 GeV p-N interactions Presented by Mauro Villa for the Hera-B collaboration 2002/3 data taking:

Quark Matter 2002, July 18-24, Nantes, France Dimuon Production from Au-Au Collisions at Ming Xiong Liu Los Alamos National Laboratory (for the PHENIX.

Susanna Costanza - Pavia Group PANDA C.M., Stockholm – June 14, 2010

Beam Energy-Loss measurement

Charles F. Maguire Vanderbilt University

Converted photons efficiency

Pierre Auger Observatory Present and Future

Baby MIND beam test status

Tatia Engelmore, Columbia University

Litao Zhao Liaoning University&IHEP

Reddy Pratap Gandrajula (University of Iowa) on behalf of CMS

STAR Detector Event selection and triggers Corrections to data

LHCb Particle Identification and Performance

Estimation of Sensitivity to Gamma Ray point Sources above 30TeV

Samples and MC Selection

Identified Charged Hadron Production at High pT

Understanding of the E391a Detector using KL decay

Problems in π0 Reconstruction

Presentation transcript:

2012/7/231 Cosmic Ray at STAR Shuai Yang Center of Particle Physics and Technology University of Science and Technology of China STAR Regional Meeting Weihai, China, July 23 th – 25 th, 2012

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 2 Outline  Introduction Muon charge ratio from cosmic ray EAS Cosmic ray at STAR  Event and Track selection Event selection Track selection Match muon tracks  Analysis results Improve of momentum resolution Reject of gamma conversion event μ + /μ - vs. Momentum μ + /μ - vs. Multiplicity  Summary

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 3 Muon charge ratio from cosmic ray EAS Result of the MC simulation of iron and proton induced showers EAS: Extensive Air Shower, A fixed target experiment beyond LHC energy

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 4 Cosmic ray at STAR Advantage: Precisely measure muon momentum upto several hundred GeV/c Large acceptance to measure muon bundles x y

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 5 Event selection Cosmic triggers Laser run All Events Reversed Full Field tra ck s> =2 & & ru nI d cu ts Full Field Global tracks >=2 Reject bad runIds Cosmic trigger Ids & no laser trigger Id Event Candidates

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 6 Track selection 700>Track_flag>0 nHitsFit>=15 P > 3 GeV/c Muon Track Candidates

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 7 x y Match muon tracks  Project tracks onto R=220cm plane, pickup the upstream point  For every two tracks with p>3 GeV/c Compare R*(pos_phi2-pos_phi1) Compare pos_z2 – pos_z1 Compare p_phi2-p_phi1 and p_theta2 – p_theta1 p = -p for the track with larger firstPoint_y  For those qualified from above 2D cuts are considered as matched candidates.

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 8 2D cuts to further suppress random combinatorial background 2D correlation for muon matching

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 9 Improve momentum resolution Refit_1

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 10 Refit_2 ： makes a direct helix refit to all the hit points from the paired tracks(still ongoing, not finish yet) By Prof. Shao

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 11 “Neutral” track The reason of "neutral" track: Gamma conversion (low momentum) The charge sign for one track is wrong (large momentum)

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 12 Gamma conversion 3-10GeV/c GeV/c The charge sign is redefined from the refit after rejecting the gamma conversion events according the deflection direction

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 13 Results μ + /μ - vs. Momentum μ + /μ - vs. Multiplicity Proton induced showers: low multiplicity ratio > 1 (~1.3) Iron induced showers: high multiplicity ratio ~ 1

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 14 Ratio vs. Momentum FF

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 15 Different Multiplicity definition MuonpairMult: Selected Muonpair events MatchMult: flag of global track ∈ (0,700) ; flag of match >0 SingleMuonMult: Selected Muon events GlobalMult ： flag of global track ∈ (0,700) ; nHitsFit>= 15 ; firstpoint.Z() && lastpoint.Z() ∈ [-180,180] TofMult ： BTofHit(BTofHit_mTray[i]<=120)

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 16 MuonpairMult. - the most reliable multiplicity definition RFF FF Decrease with multiplicity? Reconstructed Muonpair Multiplicity is too small

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 17 MatchMult. RFF FF

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 18 SingleMuonMult. RFF FF

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 19 GlobalMult. From the ratio vs. four different multiplicity definitions: Ratio decreases with increasing multiplicity. Physics reason? Detector reason? RFF FF

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 20 TofMult. Most of the tof hits are not associated with global track.

2012/7/23 Shuai Yang, STAR Regional Meeting, Weihai 21 Summary We can matched muon tracks with good s/b ratio and efficiency Combined two muon tracks can improve the momentum resolution Can get ratio with very good precision upto several hundred GeV/c Can observe ratio decrease with multiplicity, but need to check the reason.