# Drell-Yan nuclear modification due to nuclear effects of nPDFs and initial-state parton energy loss

• By globally analyzing nuclear Drell-Yan data including all incident energies, the nuclear effects of nuclear parton distribution functions (nPDFs) and initial-state parton energy loss are investigated. Based on the Landau-Pomeranchuk-Migdal (LPM) regime, the calculations are carried out by means of analytic parametrizations of quenching weights derived from the Baier-Dokshitzer-Mueller-Peign$\acute{e}$-Schiff (BDMPS) formalism and using the new EPPS16 nPDFs. It is found that the results are in good agreement with the data and the role of the energy loss effect in the suppression of Drell-Yan ratios is prominent, especially for low-mass Drell-Yan measurements. The nuclear effects of nPDFs become more obvious with increasing nuclear mass number A, the same as the energy loss effect. By a global fit, the transport coefficient extracted is $\hat{q} = 0.26\pm0.04$ GeV2/fm. In addition, to avoid diminishing the QCD NLO correction to the data form of Drell-Yan ratios, separate calculations of the Compton differential cross section ratios $R_{\rm Fe(W)/C}(x_{\rm F})$ at 120 GeV are performed, which provides a feasible way to better distinguish the gluon energy loss in Compton scattering. It is found that the role of the initial-state gluon energy loss in the suppression of Compton scattering ratios is not very important and disappears with the increase of $x_{\rm F}$.
•  [1] M. B. Johnson et al., Phys. Rev. C 65, 025203 (2002 doi: 10.1103/PhysRevC.65.025203 [2] F. Arleo, C.-J. Naïm, and S. Platchkov, JHEP 1901, 129 (2019 [3] L.-H. Song and L.-W. Yan, Phys. Rev. C 96, 045203 (2017 doi: 10.1103/PhysRevC.96.045203 [4] N. Armesto and E. Scomparin, Eur. Phys. J. Plus 131, 52 (2016 doi: 10.1140/epjp/i2016-16052-4 [5] G.-Y. Qin and X.-N. Wang, Int. J. Mod. Phys. E 24, 1530014 (2015 [6] J. Badier et al., Phys. Lett. B 104, 335 (1981 doi: 10.1016/0370-2693(81)90137-4 [7] P. Bordal et al., Phys. Lett. B 193, 368 (1987 doi: 10.1016/0370-2693(87)91253-6 [8] D. M. Alde et al., Phys.Rev.Lett. 64, 2479 (1990 doi: 10.1103/PhysRevLett.64.2479 [9] M. A. Vasiliev et al., Phys.Rev.Lett. 83, 2304 (1999 doi: 10.1103/PhysRevLett.83.2304 [10] P.-J. Lin, http://lss.fnal.gov/archive/thesis/2000/fermilab-thesis-2017-18.pdf, Ph.D. thesis, Colorado U., 2017. 10.2172/1398791 [11] G. T. Garvey and J. C. Peng, Phys. Rev. Lett. 90, 092302 (2003 doi: 10.1103/PhysRevLett.90.092302 [12] F. Arleo, Phys. Lett. B 532, 231 (2002 doi: 10.1016/S0370-2693(02)01539-3 [13] L.-H. Song and C.-G. Duan, Phys. Lett. B 708, 68 (2012 doi: 10.1016/j.physletb.2012.01.019 [14] Hongxi Xing et al., Nucl. Phys. A 879, 77 (2012 doi: 10.1016/j.nuclphysa.2012.01.012 [15] K. J. Eskola, V. J. Kolhinen, and P. V. Ruuskanen, Nucl. Phys. B 535, 351 (1998 doi: 10.1016/S0550-3213(98)00589-6 [16] K. J. Eskola, H. Paukkunen, and C. A. Salgado, JHEP 0807, 102 (2008 [17] W. T. Deng and X. N. Wang, Phys. Rev. C 81, 024902 (2010 doi: 10.1103/PhysRevC.81.024902 [18] K. J. Eskola, H. Paukkunen, and C. A. Salgado, J. High Energy Phys. 04, 065 (2009 [19] M. Hirai, S. Kumano, and T.H. Nagai, Phys. Rev. C 76, 065207 (2007 doi: 10.1103/PhysRevC.76.065207 [20] D. de Florian and R. Sassot, Phys. Rev. D 69, 074028 (2004 doi: 10.1103/PhysRevD.69.074028 [21] J. G. Heinrich et al., Phys. Rev. Lett. 63, 356 (1989 doi: 10.1103/PhysRevLett.63.356 [22] K. J. Eskola, P. Paakkinen, H. Paukkunen et al., Eur. Phys. J. C 77, 163 (2017 doi: 10.1140/epjc/s10052-017-4725-9 [23] S. Peigné and A. Smilga, Phys. Usp. 52, 659 (2009 doi: 10.3367/UFNe.0179.200907a.0697 [24] F. Arleo, R. Kolevatov, and S. Peigné, Phys. Rev. D 93, 014006 (2016 doi: 10.1103/PhysRevD.93.014006 [25] R. Baier et al., Nucl. Phys. B 484, 265 (1997 doi: 10.1016/S0550-3213(96)00581-0 [26] R. Baier et al., High Energy Phys. 09, 033 (2001 [27] F. Arleo, J. High Energy Phys. 11, 044 (2002 [28] J. Kubar et al., Nucl. Phys. B 175, 251 (1980 doi: 10.1016/0550-3213(80)90053-X [29] K. Kovarik et al., Phys. Rev. D 93, 085037 (2016 doi: 10.1103/PhysRevD.93.085037 [30] M. Glück, E. Reya, and I. Schienbein, Eur. Phys. J. C 10, 313 (1999 doi: 10.1007/s100529900124 [31] M. Hirai, S. Kumano, and M. Miyama, Phys. Rev. D 64, 034003 (2001 doi: 10.1103/PhysRevD.64.034003

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Li-Hua Song, Peng-Qi Wang and Yin-Jie Zhang. The Drell-Yan nuclear modification due to the nuclear effects of nPDFs and initial-state parton energy loss[J]. Chinese Physics C. doi: 10.1088/1674-1137/abe110
Li-Hua Song, Peng-Qi Wang and Yin-Jie Zhang. The Drell-Yan nuclear modification due to the nuclear effects of nPDFs and initial-state parton energy loss[J]. Chinese Physics C.
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沈阳化工大学材料科学与工程学院 沈阳 110142

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## Drell-Yan nuclear modification due to nuclear effects of nPDFs and initial-state parton energy loss

###### Corresponding author: Li-Hua Song, songlh@ncst.edu.cn
• 1. College of Science, North China University of Science and Technology, Tangshan 063210, China
• 2. College of Physics Science and Technology, Hebei University, Baoding 071002, China

Abstract: By globally analyzing nuclear Drell-Yan data including all incident energies, the nuclear effects of nuclear parton distribution functions (nPDFs) and initial-state parton energy loss are investigated. Based on the Landau-Pomeranchuk-Migdal (LPM) regime, the calculations are carried out by means of analytic parametrizations of quenching weights derived from the Baier-Dokshitzer-Mueller-Peign$\acute{e}$-Schiff (BDMPS) formalism and using the new EPPS16 nPDFs. It is found that the results are in good agreement with the data and the role of the energy loss effect in the suppression of Drell-Yan ratios is prominent, especially for low-mass Drell-Yan measurements. The nuclear effects of nPDFs become more obvious with increasing nuclear mass number A, the same as the energy loss effect. By a global fit, the transport coefficient extracted is $\hat{q} = 0.26\pm0.04$ GeV2/fm. In addition, to avoid diminishing the QCD NLO correction to the data form of Drell-Yan ratios, separate calculations of the Compton differential cross section ratios $R_{\rm Fe(W)/C}(x_{\rm F})$ at 120 GeV are performed, which provides a feasible way to better distinguish the gluon energy loss in Compton scattering. It is found that the role of the initial-state gluon energy loss in the suppression of Compton scattering ratios is not very important and disappears with the increase of $x_{\rm F}$.

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