ICPAQGP-2010

5-10 December 2010

6th International Conference on Physics and Astrophysics of Quark Gluon Plasma (ICPAQGP 2010)

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Photon Multiplicity measurements at forward rapidity in the ALICE experiment at CERN

Content:

The ALICE Experiment [1] at the CERN Large Hadron Collider (LHC) is designed specifically for heavy-ion physics for the search and study of Quark Gluon Plasma (QGP). It is as well suited for proton-proton, proton-ion collisions. The pseudorapidity and the multiplicity distributions of the produced particles in proton-proton (pp) collisions at larger pseudorapidities are important for understanding the particle production mechanism, the scaling laws and the limiting fragmentation behavior. Data from pp collisions also provides the reference for the heavy-ion program. A Photon Multiplicity Detector (PMD) has been built and installed [2] in the ALICE experiment in forward pseudorapidities (2.3 to 3.9). The PMD is a preshower detector consisting of about 200K honeycomb cells, each of which acts like a proportional counter. The performance of the detector has been good throughout the current LHC running period. A large number of events have already been recorded for pp collisions at √s = 0.9 and 7 TeV. A detailed analysis has been performed for these data for minimum bias trigger. The multiplicity and pseudorapity distributions have been obtained within the PMD coverage. The data have been compared to measurements at lower energies and to model predictions of Pythia and Phojet. The analysis details and the results will be presented. References: [1] ALICE Collaboration JINST 3:S08002,2008 [2] Addendum to the TDR of the PMD, CERN/LHCC 2003-nn

Collaboration:

ALICE Collaboration

Id:

151

Place:

Room: Main Auditorium

Starting date:

--not yet scheduled--

Duration:

00'

Primary Authors:

Mr. PRASAD, Sidharth Kumar (VECC)

Presenters:

Mr. PRASAD, Sidharth Kumar