Measurement of J/  -> e + e - and  C -> J/  +   in dAu collisions at PHENIX/RHIC A. Lebedev, ISU 1 Fall 2003 DNP Meeting Alexandre Lebedev, Iowa State.

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Measurement of J/  -> e + e - and  C -> J/  +   in dAu collisions at PHENIX/RHIC A. Lebedev, ISU 1 Fall 2003 DNP Meeting Alexandre Lebedev, Iowa State University for the PHENIX Collaboration 1. Motivation 2. J/  measurement 3.  C measurement

Motivation A. Lebedev, ISU 2 Fall 2003 DNP Meeting If quark- gluon plasma (QGP) is formed in relativistic heavy ion collisions, c olor screening will lead to suppression of charmonium production ( T. Matsui, H. Satz, Phys. Lett. B178(1986)416 ). A promising signal of QGP formation. More recent studies predict increased J/  production at RHIC due to recombination ( R.L. Thews et al, Phys. Rev. C63(2001) ). It is important to measure simulataneously several charmonium states, e.g. J/  and  C to find out which models of charmonium production work best. dAu collisions, along with pp, provide a baseline for understanding J/  and  C production in AuAu.

The PHENIX Experiment A. Lebedev, ISU 3 Fall 2003 DNP Meeting The PHENIX experiment at RHIC has the unique ability to measure both J/  and  C in relativistic heavy ion collisions. Charged particle tracking and the momentum measurement by the Drift Chamber. Electron identification in Ring Imaging Cherenkov Detector and Electromagnetic Calorimeter (EMCal). Photon Identification in EMCal Muon tracking and identification in Muon Arms.

J/  measurement in the PHENIX Central Arms A. Lebedev, ISU 4 Fall 2003 DNP Meeting The plot shows e+e- invariant mass distribution for 20%- 25% of all run3 dAu data. Combinatorial background is subtracted The background was caculated using mixed events method (same sign background does not work in Phenix). Background is normalized using the number of same sign pairs. In all of run3 dAu we can expect to have J  With looser vertex and electron ID cuts we can get as many as ~700 J 

Acceptance for  C ->    + J/  -> e + e - A. Lebedev, ISU 5 Fall 2003 DNP Meeting To calculate  C acceptance, a simulation using single  C was done. If J/  is detected in the Phenix Central Arms, the probability to detect the photon is 11% Assuming that 40% of J/  come from  C, we can expect few tens of reconstructed  C in all run3 dAu data.

Acceptance for  C ->    + J/  ->     A. Lebedev, ISU 6 Fall 2003 DNP Meeting In case of J/Psi decaying to , the probablility to detect the photon in Central Arms, while muons are detected in Muon Arms is 2.5%. Expected number of reconstruced J/  in Muon Arms is ~1000 per arm, which makes the expected number of reconstructed  C in this channel comparable to e+e- channel. However, the photon energy is very low, which makes  C measurement using Muon Arms practically impossible.

Background estimate for  C -> J/  +  A. Lebedev, ISU 7 Fall 2003 DNP Meeting The plot shows  C - J/  invariant mass distribution for 20%- 25% of all run3 dAu data. Several  C are expected in this plot. Red histogram shows combinatorial background calculated using mixed events method. The width of  C peak is expected to be ~55 MeV (from EMCal resolution and full scale simulations). Combinatorial background will be counts per 100 MeV bin.

Full scale simulation A. Lebedev, ISU 8 Fall 2003 DNP Meeting For a more realistic study, single J/  and  C were merged with simulated dAu events, and complete data analysis was performed. 40% of events with merged  C were added to 60% of events with merged J/  Red histogram in the top plot shows combinatorial background calculated using mixed events method. Background was normalized at the tail of the distribution (mass>0.55 GeV). This plot corresponds to 5-6 times larger statistics than we expect in run3 dAu.

Ways to reduce background A. Lebedev, ISU 9 Fall 2003 DNP Meeting 1. Changing photon energy cut.. Lower cut will move the maximum of the background to lower masses. 2. Use angle between the photon and the J  The background is peaked at small angles. 3. Use correlation between the photon and electron momenta. Momentum of the electron in the same arm with the photon is correlated with the photon momentum. 4. Remove photon pairs which have pi- zero mass.

Conclusions A. Lebedev, ISU 10 Fall 2003 DNP Meeting The ongoing J/  -> e + e - and  C -> J/  +  analysis in dAu collisions was presented. ~500 J/  are expected to be reconstructed in run3 dAu. Expected number of reconstructed Chi is few tens, while combinatorial background is expected to be counts per 100 MeV In Central Arms Chi measurement is difficult but feasible, while in Muon Arms it is impossible due to low photon energy.