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

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 -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

Texas A&M Group Ahmed M. Hamed BNL 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.

?  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

 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

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

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 In medium:

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  0 simulation photon simulation

Texas A&M Group Ahmed M. Hamed BNL    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?

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

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

 -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),  ~ s Texas A&M Group Ahmed M. Hamed BNL  0 ’s p T (GeV/c) Opening angle(rad) Experimental Challenges Is it possible to measure?

L2 Gamma Trigger in Run 2007 Texas A&M Group Ahmed M. Hamed BNL 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. All runs after 8143* are in the reversed full field configuration.

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

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

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

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

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

Showers shape Analysis Real data vs. Single particle simulation Texas A&M Group Ahmed M. Hamed BNL Shower shape is wider in real data than in simulation!

Shower Shape Analysis Real data vs. pythia Texas A&M Group Ahmed M. Hamed BNL

Texas A&M Group Ahmed M. Hamed BNL 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.

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

Texas A&M Group Ahmed M. Hamed BNL Shower Shape Analysis  0 vs. electron

Texas A&M Group Ahmed M. Hamed BNL Shower Shape Analysis  0 vs. electron

Texas A&M Group Ahmed M. Hamed BNL Shower Shape Analysis  0 vs. electron

Texas A&M Group Ahmed M. Hamed BNL Shower Shape Analysis  0 vs. electron

Summary Texas A&M Group Ahmed M. Hamed BNL  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.

Texas A&M Group Ahmed M. Hamed BNL Motivation BEMC-  0