Monday, April 27, 20091 Feasibility of J/ψ measurement in p+A 25GeV Partha Pratim Bhaduri (VECC) Anand Kumar Dubey (VECC) S. Chattopadhyay.

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Presentation transcript:

Monday, April 27, Feasibility of J/ψ measurement in p+A 25GeV Partha Pratim Bhaduri (VECC) Anand Kumar Dubey (VECC) S. Chattopadhyay (VECC) Arun Prakash (BHU)

Monday, April 27, Motivation  Proton-nucleus (p+A) collisions is a fundamental component of any heavy-ion physics programme  Defines the reference baseline relative to which we recognize HI specific phenomena  p+A collisions provide a measure of the nuclear effects – helps in disentangling the “QGP” effect from the “non-QGP” effects. Here there is no formation time for the “secondary” medium, hence such collisions provide as essential tool to correctly account for the effect of the nuclear medium initially present.  Charm propagation in cold nuclear matter & normal absorption.

Monday, April 27, The specifications of the system chosen are:  Target : Au (79, 197)  Projectile : p (1, 1)  Beam energy : 25 GeV  Collision type : Minimum bias  Event generator : Background : UrQMD Signal : Pluto (J/  ->  + +  - )  Events simulated : 10,000  Muon detection system : Standard Geometry, Start version Geometry An extremely asymmetric system The p-A System

Monday, April 27, p-Au Au-Au Detector coverage:  in = 5.3 degree  out = 26.7 degree eta max = 3.07 eta min = 1.44 Pluto MUCH Detector acceptance rejects background Acceptance (system asymmetry)

Monday, April 27, cm Fe Number of stations : 18 Number of absorbers : 6 Total absorber thickness:13.5 λ Muon Detection System: Standard Geometry

Monday, April 27, New Geometry (Reduced Number of stations) Fe 185 cm 20 cm μ J/ψ 9 stations 3 Fe absorbers Total absorber thickness: 13.5 λ Start Version geometry

Monday, April 27, Standard geo Start version geo Pluto (signal muons) generated accepted generated accepted Accepted tracks (STS points>=4, MUCH Points>=70% of the total no. of muon detectors) pT(GeV/c) Rapidity(Y)

Monday, April 27, Reconstructed J/ψ Standard Geometry Reconstructed J/ψ Standard Geometry Reconstruction efficiency : 22.3 %, (10 K embedded events, URQMD+PLUTO) Invariant mass Pair pT Pair rapidity

Monday, April 27, Reconstruction Efficiency : % Reconstructed J/ψ Start version Geometry Reconstructed J/ψ Start version Geometry Pair pT Pair rapidity

Monday, April 27, Summary & Future Plans First estimates of reconstruction efficiency of J/y in SIS100 clearly shows the feasibility of measurement Much less background in pA owing to the typical geometrical acceptance A START VERSION geometry of MUCH with 9 stations implemented. preliminary comparison conveys similar reconstruction efficiency. More study underway. Estimation of background & calculation of S/B ratio will be done Transport models (HSD) will be implemented to include the system asymmetry in production of signal muons.

BACKUPS Monday, April 27,

Monday, April 27, UrQMD (background)

Monday, April 27, UrQMD (background)– start version geometry

Monday, April 27, Motivation  Aim of the relativistic heavy-ion collisions is to study the onset of de-confinement and the properties of the de-confined media in the laboratory.  Necessary to define unambiguous and experimentally viable probes for de- confinement.  Proton-nucleus (p+A) collisions is thus a fundamental component of any heavy-ion physics programme  Defines the reference baseline relative to which we recognize HI specific phenomena  p+A collisions provide a measure of the nuclear effects – helps in disentangling the “QGP” effect from the “non-QGP” effects. Here there is no formation time for the “secondary” medium, hence such collisions provide as essential tool to correctly account for the effect of the nuclear medium initially present.  Charm propagation in cold nuclear matter & normal absorption.

Monday, April 27, Pluto (signal muons)—Standard Geometry Accepted tracks (STS points>=4 Much Points>=70% of the total no. of muon detectors)

Monday, April 27, Pluto (signal muons)