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Physics Prospects from PMD in d+Au collisions at RHIC

Physics Prospects from PMD in d+Au collisions at RHIC. Like to address the following physics issues :. Photon Multiplicity distribution Longitudinal Scaling in asymmetric collisions Reference data for photon production in Au+Au collisions. Photon-Charged hadron Azimuthal Angle Correlations

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Physics Prospects from PMD in d+Au collisions at RHIC

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  1. Physics Prospects from PMD in d+Au collisions at RHIC Like to address the following physics issues : Photon Multiplicity distribution • Longitudinal Scaling in asymmetric collisions • Reference data for photon production in Au+Au collisions Photon-Charged hadron Azimuthal Angle Correlations • Similar rapidity range and forward-backward • High ADC/Energy photon cluster triggered correlation with mid-rapidity charged hadrons • Mid-rapidity charged hadron triggered correlation with photon clusters in PMD

  2. What we learn’t from the Photon Multiplicity Distribution in Au+Au Collisions Scaling energy independent for both photons and charged hadrons Scaling centrality independent for photons and dependent for charged hadrons Difference due to baryons Longitudinal Scaling STAR : PRC 73 (2006) 034906 STAR : PRL 95 (2005) 062301

  3. Want to see how the scaling works for d+Au data Given : Scaling centrality independent for photons and dependent for charged hadrons How does d+Au photon distribution fit into the picture of longitudinal scaling ? Already studied for charged hadrons in d+Au collisions by PHOBOS PHOBOS : PRC (2005)

  4. d+Au photon data a reference for Au+Au Reference data to understand the mechanism of photon production in high energy collisions

  5. Expected Multiplicity, Feasibility, Events required d+Au Collisions at 200 GeV Minimum bias HIJING Simulation In PMD coverage Feasibility : We have reconstructed such multiplicity in Cu+Cu and peripheral Au+Au collisions Events required : For a statistical error of 1%, we require 300 K useable PMD events with minimum bias trigger

  6. Photon-Charged hadron correlation Two points to keep in mind : • The energy deposited by photons in the detector (Cluster ADC) roughly proportional to photon energy. HIJING PMD-FTPC same coverage • Majority of the photons are from 0 decay Physics issues : • To understand correlation between charged hadron and photon production in d+Au collisions. • Charged hadron - Photon correlations in forward-backward can help understand effects of short and long range correlations. HIJING PMD-FTPC (west) Reference studies in STAR for Au+Au : • http://www.star.bnl.gov/protected/ebye/tjt/LRC_Paper/lrc.html • http://www.star.bnl.gov/protected/ebye/sunil/correlation/charge-neutral_corr.html

  7. Ep p0 p d EN qq qp p Au xgp xqp qg EN Motivation for triggered photon-charged hadron correlation Taking high pT0 in forward rapidity - allows probing high-x valence quark correlations with low -x gluons : A probe of low-x gluons Signature of CGC STAR : PRL 97 (2006) 152302 Kharzeev, Levin, McLerran NPA748, 627

  8. Triggered photon cluster in PMD - charged hadron correlation STAR : PRL 97 (2006) 152302 Want to investigate correlations with triggered high ADC/Energy photon cluster in PMD coverage and mid rapidity charged hadrons. Note PMD is on the Au going side HIJING Simulations are underway for such a study. Preliminary estimate shows for a correlation signal of 1% Level above background we need of the order of 1 million events

  9. Triggered mid-rapidity charged hadron - photon cluster in PMD correlation - d+Au collisions Want to investigate correlations similar to those carried out below with FTPC-TPC Trigger part. : 3<pTtrig<4 GeV/c Assoc. FTPC: 0.2<pTassoc< 2 GeV/c Assoc. MTPC: 0.2<pTassoc< 3 GeV/c |htrig|<1, 2.7<|hassoc|<3.9 Jet correlation dAu at forward rapidities Not a simple recombination (Hwa, Yang, nucl-th/0605037) Hierarchy in the away side yields: CGC? Away-side correlations are very similar in MTPC and FTPC! Reference : L. Molnar - QM2006

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