Speaker
Dr
Umme Jamil Begum
(Debraj Roy College, Golaghat, Assam, India)
Description
Heavy quarks produced in the initial stage of heavy ion collisions would traverse the quark gluon plasma. While traversing the quark gluon plasma, they will loose energy by colliding with quarks and gluons and also by radiating gluons. After their production, they may get fragmented into heavy mesons by picking up light quarks/antiquarks and in turn may decay through leptonic channels. These leptons would carry information of the initial stage of heavy ion collisions and also the evolution of the plasma.
In this work, we have made a detailed study for the nuclear modification factor, RAA and elliptic flow, v2 of muons from heavy flavours decay at forward rapidities in Pb+Pb collision @ 2.76 ATeV at LHC. The pT distribution of heavy quarks produced from the initial fusion of partons, is obtained from FONLL ( Fixed Order Next-to-Leading Logarithms) approach [3, 4]. We consider both the radiative and collision energy loss along with a boost-invariant expansion of the plasma for the prediction of RAA as well as v2. The fragmentation of heavy quarks into D-mesons is governed by Peterson fragmentation function [5].
We compare our result of muon RAA from heavy flavour in Pb+Pb collisions at 2.76 ATeV with the ALICE data and found that our result can satisfactorily explain the experimental data. The nuclear modification factor of muons at 0-10% centrality calculated by the present formalism [2] has shown very good agreement with the ALICE data [6]. However the calculation shows more suppression while we take account the collisional energy loss.
We also compare our result of muon v2 from heavy flavour at 20-40% centrality for Pb+Pb collisions at 2.76 ATeV with the ALICE Preliminary data [7].
References:
1. U. Jamil and D. K. Srivastava, J. Phys. G 37, 085106 (2010).
2. R. Abir et al., Phys. Lett. B 715, 183 (2012).
3. M. Cacciari, M. Greco and P. Nason, J. High Energy Phys.9805, 007 (1998).
4. M. Cacciari, S. Frixione and P. Nason, J. High Energy Phys.0103, 006 (2001).
5. C. Peterson, D. Schlatter, I. Schmitt, P. Zerwas, Phys. Rev. D 27, 105 (1983).
6. ALICE Collaboration, Phys. Rev. Lett. 109, 112301 (2012).
7. Xiaoming Zhang for the ALICE Collaboration, LBNL, USA, Strangeness in Quark Matter, 22-27 July, 2013, Bermingham, U.K.
| On behalf of collaboration: | None |
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Primary author
Dr
Umme Jamil Begum
(Debraj Roy College, Golaghat, Assam, India)
Co-authors
Dinesh Srivastava
(Variable Energy Cyclotron Centre, Kolkata)
Prof.
Munshi Golam Mustafa
(Saha Institute of Nuclear Physics, Kolkata, India)
Dr
Raktim Abir
(Wayne State University, Detroit, United States)
Somnath De
(Variable Energy Cyclotron Centre, Kolkata)
