Presentation is loading. Please wait.

Presentation is loading. Please wait.

 -jet measurements Table of Contents:  Motivation  Preliminary QA of  -trigger Data  Shower Shape Analysis  Experimental Challenges  Summary  

Published byMerryl Glenn Modified over 8 years ago

Similar presentations

Presentation on theme: " -jet measurements Table of Contents:  Motivation  Preliminary QA of  -trigger Data  Shower Shape Analysis  Experimental Challenges  Summary  "— Presentation transcript:

1  -jet measurements Table of Contents:  Motivation  Preliminary QA of  -trigger Data  Shower Shape Analysis  Experimental Challenges  Summary   -trigger in Run 2007 Texas A&M Group Ahmed M. Hamed BNL 10-17-07

2 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Motivation Why  -jet measurements? Single Particle Spectra-R AA Mid-rapidity Statistical Method Heavy quarks suppress as much as light quarks in the medium.  R AA exhibits only very limited sensitivity to the properties of the medium.  More differential observable is needed.

3 ?  Near-side: p+p, d+Au, Au+Au is similar.  Back-to-back: Au+Au strongly suppressed relative to p+p and d+Au. Suppression of the back- to-back correlation in central Au+Au is a final-state effect Motivation Why  -jet measurements? Jet-like azimuthal correlations  Surface bias for the trigger particle.  Trigger particle with no surface bias is required for better calibration of the away-side jet.  Trigger particle with no surface bias is required for better calibration of the away-side jet. Texas A&M Group Ahmed M. Hamed BNL 10-19-07

4  Better understanding for the energy loss mechanism! Elliptic flow. oDirect Photons: Gamma-charged hadrons correlation. Four multipurpose experiments (BRAHMS, PHENIX, PHOBOS, STAR)  Empirical lines of evidence: Energy density well beyond critical value. Large elliptic flow. Jet quenching. dAu control experiment.  Interpreted in terms of a strongly coupled QGP and a new QCD state (?) Color Glass Condensate Required:  Challengeable measurements! Doesn’t couple to the medium. QGP thermal photons. Test for binary scaling for hard process. Motivation Why  -jet measurements? Summary Texas A&M Group Ahmed M. Hamed BNL 10-19-07

5 Motivation Why  -jet measurements? LO Direct photons Bremsstrahlung fragmentation component direct component Decay photons hard: thermal: schematic view Calibrated probe of the QGP – at LO. No Surface Bias Hard process Possible discriminator for quark/gluon jet at LO. oGamma-charged hadrons correlation. Texas A&M Group Ahmed M. Hamed BNL 10-19-07

6 Experimental Challenges Is it possible to measure?   0 – spectra are suppressed by a factor of ~5 relative to the scaled p+p collisions. Pythia v6.131 event generator pp-collisions at √s=200 GeV, |η|<1 (STAR acceptance)  The away-side in di-jet production is more suppressed.  Background sources of direct photons suppressed in medium. Texas A&M Group Ahmed M. Hamed BNL 10-19-07 In medium:

7 Inclusive  - jet in Au+Au at  s=200GeV Thomas Dietel Quark Matter 2005 SIMULATION (pp)  Away-side decreases with increasing centrality.  Decrease in near-side due to the increased fraction of prompt photons.  Need  /  0 discrimination. STAR Preliminary  Simulation shows no associated particles in  -charged correlation. Experimental Challenges Is it possible to measure? Texas A&M Group Ahmed M. Hamed BNL 10-19-07  0 simulation photon simulation

8 Texas A&M Group Ahmed M. Hamed BNL 10-19-07    Bin Mixed  Bin S. Chattopadhyay Quark Matter 2006  Reduction in near angle peak towards photon Bin.  Effect is more prominent for larger E t trigger.  Away-side yield is reduced. Experimental Challenges Is it possible to measure?

9 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Experimental Challenges Is it possible to measure? cucu2005 STAR Preliminary

10 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Experimental Challenges Is it possible to measure?

11  -plane  -plane High energy core. Low energy halo.  Electromagnetic transverse shower characteristics  0 DECAY KINEMATICS Towers (~0.05x~0.05), Strips (~0.007x~0.007), d ~2.2m at  =0, l~2.93m.  min = 2 Sin –1 (m Inv /E),  ~10 -17 s Texas A&M Group Ahmed M. Hamed BNL 10-19-07  0 ’s p T (GeV/c) Opening angle(rad) Experimental Challenges Is it possible to measure?

12 L2 Gamma Trigger in Run 2007 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 o Tower threshold ET=5.76 [GeV] o Cluster threshold ET= 7.44 [GeV] o Cluster size is one or two tower. L2gammaResult Contains: phi_bin,eta_bin, tower E T, and Cluster E T. ~1.2M events. ~50% Reversed Full Field. http://online.star.bnl.gov/L2gamma2007/l2gamma2007_bemc/ All runs after 8143* are in the reversed full field configuration.

13 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Preliminary QA of  -trigger Data- BEMC

14 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Preliminary QA of  -trigger Data- BEMC

15 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Preliminary QA of  -trigger Data- BSMD saturation

16 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Preliminary QA of  -trigger Data- BEMC  0

17 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Tower_Id !=1433,3407,3711,3720,3840 Preliminary QA of  -trigger Data- Hot Towers

18 Showers shape Analysis Real data vs. Single particle simulation Texas A&M Group Ahmed M. Hamed BNL 10-19-07 pp@2006 Shower shape is wider in real data than in simulation!

19 Shower Shape Analysis Real data vs. pythia Texas A&M Group Ahmed M. Hamed BNL 10-19-07 pp@2006

20 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Shower Shape Analysis Real data vs. pythia o Pythia doesn ’ t reproduce the shower shape even with saturation! Saturation parameters-Eta [700,70,10] Saturation parameters-Phi [700,70,10] o In phi-plane the shower shape is closer to the real data than in eta.

21 Shower Shape Analysis  0 vs. electron Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Saturation parameters-Eta [700,70,10] Saturation parameters-Phi [700,70,10]

22 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Shower Shape Analysis  0 vs. electron

23 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Shower Shape Analysis  0 vs. electron

24 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Shower Shape Analysis  0 vs. electron

25 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Shower Shape Analysis  0 vs. electron

26 Summary Texas A&M Group Ahmed M. Hamed BNL 10-19-07  Embedding request is still under processed.   -jet measurements are very promising tool for better understanding of the medium.  Shower shape study is required for direct photons identification.  Promising study for transverse shower profile is undertaken.

27 Texas A&M Group Ahmed M. Hamed BNL 10-19-07 Motivation BEMC-  0 AuAu@2007

Download ppt " -jet measurements Table of Contents:  Motivation  Preliminary QA of  -trigger Data  Shower Shape Analysis  Experimental Challenges  Summary  "

Similar presentations

1 Jet Structure of Baryons and Mesons in Nuclear Collisions l Why jets in nuclear collisions? l Initial state l What happens in the nuclear medium? l.

1 Jet Structure of Baryons and Mesons in Nuclear Collisions l Why jets in nuclear collisions? l Initial state l What happens in the nuclear medium? l.
Multiparticle Correlations and Charged Jet Studies in p+p, d+Au, and Au+Au Collisions at  s NN =200 GeV. Michael L. Miller Yale University For the STAR.

Multiparticle Correlations and Charged Jet Studies in p+p, d+Au, and Au+Au Collisions at  s NN =200 GeV. Michael L. Miller Yale University For the STAR.
Photon-Hadron Correlations at RHIC Saskia Mioduszewski Texas A&M University E-M Workshop of RHIC/AGS Users’ Meeting 27 May, 2008.

Photon-Hadron Correlations at RHIC Saskia Mioduszewski Texas A&M University E-M Workshop of RHIC/AGS Users’ Meeting 27 May, 2008.
Photon-Jet Correlations at RHIC Saskia Mioduszewski Texas A&M University 18 July, 2007.

Photon-Jet Correlations at RHIC Saskia Mioduszewski Texas A&M University 18 July, 2007.
Charm & bottom RHIC Shingo Sakai Univ. of California, Los Angeles 1.

Charm & bottom RHIC Shingo Sakai Univ. of California, Los Angeles 1.
Heavy Quark Probes of QCD Matter at RHIC Huan Zhong Huang University of California at Los Angeles ICHEP-2004 Beijing, 2004.

Heavy Quark Probes of QCD Matter at RHIC Huan Zhong Huang University of California at Los Angeles ICHEP-2004 Beijing, 2004.
Jet and Jet Shapes in CMS

Jet and Jet Shapes in CMS
1 Probing the medium with photons Outline: oMotivation oExperiment oResults oConclusion oIntroduction LBNL 21-05-07 Saskia Mioduszewski Ahmed Hamed.

1 Probing the medium with photons Outline: oMotivation oExperiment oResults oConclusion oIntroduction LBNL Saskia Mioduszewski Ahmed Hamed.
Relativistic Heavy-Ion Collisions: Recent Results from RHIC David Hardtke LBNL.

Relativistic Heavy-Ion Collisions: Recent Results from RHIC David Hardtke LBNL.
Ali Hanks - APS 2008 1 Direct measurement of fragmentation photons in p+p collisions at √s = 200GeV with the PHENIX experiment Ali Hanks for the PHENIX.

Ali Hanks - APS Direct measurement of fragmentation photons in p+p collisions at √s = 200GeV with the PHENIX experiment Ali Hanks for the PHENIX.
Direct photons and Jet correlation in HI. Integrated I AA (0.4

Direct photons and Jet correlation in HI. Integrated I AA (0.4
Dunlop, WW 2006 1 What More Can Be Learned from High Pt Probes at RHIC? James Dunlop Brookhaven National Laboratory.

Dunlop, WW What More Can Be Learned from High Pt Probes at RHIC? James Dunlop Brookhaven National Laboratory.
Hard Probes at RHIC Saskia Mioduszewski Texas A&M University Winter Workshop on Nuclear Dynamics 8 April, 2008.

Hard Probes at RHIC Saskia Mioduszewski Texas A&M University Winter Workshop on Nuclear Dynamics 8 April, 2008.
WWND 03/13/06 N Grau1 Jet Correlations from PHENIX Focus entirely on A+A collisions High-trigger p T correlations –Can we do jet tomography? Low-trigger.

WWND 03/13/06 N Grau1 Jet Correlations from PHENIX Focus entirely on A+A collisions High-trigger p T correlations –Can we do jet tomography? Low-trigger.
Jana Bielcikova (Yale University) for the STAR Collaboration 23 rd Winter Workshop on Nuclear Dynamics February 12-18, 2007 Two-particle correlations with.

Jana Bielcikova (Yale University) for the STAR Collaboration 23 rd Winter Workshop on Nuclear Dynamics February 12-18, 2007 Two-particle correlations with.
Direct photons and jet correlations in heavy ion collisions Andrew Adare University of Colorado For the PHENIX Collaboration WWND, February 2007.

Direct photons and jet correlations in heavy ion collisions Andrew Adare University of Colorado For the PHENIX Collaboration WWND, February 2007.
Two-, Three-, and Jet-Hadron Correlations at STAR Kolja Kauder for the STAR Collaboration Rencontres de Moriond – La Thuile, Mar 20-27 2011.

Two-, Three-, and Jet-Hadron Correlations at STAR Kolja Kauder for the STAR Collaboration Rencontres de Moriond – La Thuile, Mar
STAR Back-to-Back Di-Jet Triggered Multi-Hadron Correlations as Medium Probes in STAR Back-to-Back Di-Jet Triggered Multi-Hadron Correlations as Medium.

STAR Back-to-Back Di-Jet Triggered Multi-Hadron Correlations as Medium Probes in STAR Back-to-Back Di-Jet Triggered Multi-Hadron Correlations as Medium.
Non-photonic electron production in STAR A. G. Knospe Yale University 9 April 2008.

Non-photonic electron production in STAR A. G. Knospe Yale University 9 April 2008.
Sourav Tarafdar Banaras Hindu University For the PHENIX Collaboration Hard Probes 2012 Measurement of electrons from Heavy Quarks at PHENIX.

Sourav Tarafdar Banaras Hindu University For the PHENIX Collaboration Hard Probes 2012 Measurement of electrons from Heavy Quarks at PHENIX.

Similar presentations

Ads by Google