Status of ALICE activities within FKPPL LIA

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1 Status of ALICE activities within FKPPL LIA 1 Development of the online monitoring software for the ALICE Muon Trigger And Suppression Study for Υ S A N G - U N A H N K O N K U K U N I V E R S I T Y S E O U L, K O R E A

2 Outline 2 Online monitoring & its purpose General Online Architecture Development of the online monitoring software Summary (1) Suppression Study for Υ Summary (2) & Plans

3 Online monitoring and its purpose Monitors quality of data 3 Provide checks for the shifter so that data quality problems can be fixed in an early stage Especially important in the beginning of an experiment for efficiently and quickly solving runtime problems

4 General Online Architecture 4 DA CP Monitoring

5 Development of the online monitoring software On the MOOD framework MOOD : Monitor Of Online Data of ALICE Interactive Data Quality Monitoring framework Separated into two parts for experts and shifters Development of the expert version has been done by Valerie Barret(LPC) Contribution to the development of the shifter version Purpose of the shifter version To make the online monitoring more efficient by reducing the loading time of modules of the expert version and providing easy-tounderstand information to shifters 5

6 Development of the online monitoring software Scheme of the shifter version 6 General Information Event Type Physics event Software(Calibration) event Raw Data Quality Detector Data Link(DDL) Size

7 Development of the online monitoring software Scheme of the shifter version Strip Level Information Fired strip multiplicity & distribution Immigrated from the expert version Strip scaler distribution Software event only 7

8 Development of the online monitoring software Scheme of the shifter version 8 Global Trigger Board Information Global trigger output Unlike-Sign di-muon High P T Unlike-Sign di-muon Low P T Like-Sign di-muon High P T Like-Sign di-muon Low P T Single muon High P T Single muon Low P T Single Choice Low/High P T

9 Development of the online monitoring software Checking Trigger Board Algorithms (expert version) 9 % of errors of Muon Trigger algorithm

10 Summary (1) Summary (1) The purpose of the online monitoring is to monitor data quality through the information provided by the online monitoring software Development of the online monitoring software is separated into the expert version and the shifter version The aim of the shifter version is to make the online monitoring more efficient A few parts of modules of the shifter version are now in development 10

11 Suppression Study for Υ 11 P H Y S I C S M O T I V A T I O N A N D P E R F O R M A N C E S F O R H E A V Y Q U A R K O N I A M E A S U R E M E N T OF A L I C E M U O N S P E C T R O M E T E R

12 Suppression Study for Υ Heavy quarkonium suppression was supposed to be an ideal test of the deconfinement phase transition, Quark-Gluon Plasma (QGP) T. Matsui, H. Satz, Phys. Lett. B 178 (1986) 416 Due to color screening effects, a qq pair cannot form a bound state in the QGP with T > T D (screening temperature) Leads to the suppression of heavy quarkonia yield A strong motivation for experimental studies of quarkonia production which have been (and are being) carried out both at CERN SPS and RHIC energies 12 In fact, since the Υ(1S) dissolves only significantly above the critical temperature T C (3 or 4T C, T C = 190 MeV), at a value which should not be reached at RHIC( s NN = 200 GeV, upper limit of T RHIC 2T C 400 MeV), the spectroscopy of the Υ family at LHC energies( s NN = 5.5 TeV, T LHC 600 MeV) should reveal an unique set of information on the characteristics of the QGP

13 Suppression Study for Υ 13 Heavy quarkonia will be detected in ALICE both in the dielectron (in the central barrel) and in the dimuon channel (in the forward region) The key detectors for this study are the Transition Radiation Detector (TRD) and the Forward Muon Spectrometer Acceptance coverage for dileptons in the ALICE experiment. The x ranges are given for Pb-Pb at s = 5.5 TeV per nucleon pair

14 Suppression Study for Υ 14 ALICE Muon Spectrometer Performances for heavy quarkonia measurement J/Y -4.0<h<-2.5 Trigger efficiency ~ 96% background level 1 = 2 Pb-Pb HIJING events with dn ch /dh = h = 0 each mass resolution ~ 92 MeV reconstruction efficiency ~ 97% J/ & acceptance down to P t = 0 LHC) acceptance/4 : J/ ~4.6%, ~4.2% -4.0<h<2.5

15 Suppression Study for Υ 15 ALICE Muon Spectrometer Performances for heavy quarkonia measurement Unlike sign dimuon mass spectra (Pb-Pb ~ 10 6 s, L = 5 x cm -2 s -1 ) with p t cut > 1GeV/c no nuclear effects b<3 fm Correlated and uncorrelated are M bb b>12 fm M bb is dominant

16 Summary (2) Summary (2) & Plans Heavy quarkonium suppression was supposed to be an ideal test of the deconfinement phase transition, QGP Within the LHC energy and the acceptances of ALICE Muon Spectrometer, Υ(1S) suppression study via dimuon channel will be possible, in the p-p and Pb-Pb, and should reveal an unique set of information on the characteristics of the QGP Next plans 16 Converting MOOD-Based monitoring software into AMORE Starting Cotutelle program between Blaise Pascal Univ.(Clermont- Ferrand) and Konkuk Univ.(Seoul) within FKPPL LIA Study for Υ in p-p collision first

17 BACKUP 17

18 Development of the online monitoring software Scheme of the shifter version 18 To be done Local Trigger Board Information Multiplicity of local trigger board delivering trigger Distribution of local trigger board delivering trigger Global Trigger Board Information Global Trigger Board Scaler Checking Trigger Board Algorithms

19 Quarkonium yields vs centrality with p t cut > 1GeV/c no nuclear effects Significance is good almost ever ywhere and is higher for the med ium centralities Good statistics, except for (3S) family separation 19 J/ (1S) (2S) (3S) b (fm) ε (GeV/fm 3 ) S ( 10 3 ) S/B S/ S+B S ( 10 3 ) S/B S/ S+B S ( 10 3 ) S/B S/ S+B S ( 10 3 ) S/B S/ S+B S ( 10 3 ) S/B S/ S+B

20 Suppression studies for (1S) Due to color screening effects, a QQ pair cannot form a bound state in QGP with T >T D (screening temperature). T D can be ca lculated for different quarkonia states in l attice QCD and potential models. 20 [2] w/o suppression [1] Assumptions no nuclear absorption of (1S) no energy loss of b quarks suppression : 2 extreme scenar ii (T C =270 MeV [1] and T C =190 M ev [2]) W.M. Alberico et al, hep-ph/ C.Y. Wong, hep-ph/ Good sensitivity: the 2 scenarii can be distinguished (1S) F (fm) (formation) 0.76 T D /T C, D=dissociation 4 C=critical T D /T C 2.9

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