QCD resummation of dijet azimuthal decorrelations in pp and pA collisions

Mei-Sen Gao (Department of Physics and Center for Field Theory and Particle Physics, Fudan University, Shanghai, 200438, China) ; Zhong-Bo Kang (Department of Physics and Astronomy, University of California, Los Angeles, CA, 90095, USA; Mani L. Bhaumik Institute for Theoretical Physics, University of California, Los Angeles, CA, 90095, USA; Center for Frontiers in Nuclear Science, Stony Brook University, Stony Brook, NY, 11794, USA) ; Ding Shao (Department of Physics and Center for Field Theory and Particle Physics, Fudan University, Shanghai, 200438, China; Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Fudan University, Shanghai, 200438, China; Shanghai Research Center for Theoretical Nuclear Physics, NSFC and Fudan University, Shanghai, 200438, China) ; John Terry (Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA) ; Cheng Zhang (Department of Physics and Center for Field Theory and Particle Physics, Fudan University, Shanghai, 200438, China)

We study the azimuthal angular decorrelations of dijet production in both proton-proton (pp) and proton-nucleus (pA) collisions. By utilizing soft-collinear effective theory, we establish the factorization and resummation formalism at the next-to-leading logarithmic accuracy for the azimuthal angular decorrelations in the back-to-back limit in pp collisions. We propose an approach where the nuclear modifications to dijet production in pA collisions are accounted for in the nuclear modified transverse momentum dependent parton distribution functions (nTMDPDFs), which contain both collinear and transverse dynamics. This approach naturally generalizes the well-established formalism related to the nuclear modified collinear parton distribution functions (nPDFs). We demonstrate strong consistency between our methodology and the CMS measurements in both pp and pA collisions, and make predictions for dijet production in the forward rapidity region in pA collisions at LHC kinematics and for mid-rapidity kinematics at sPHENIX. Throughout this paper, we focus on the application of this formalism to a simultaneous fit to both collinear and transverse momentum dependent contributions to the transverse momentum dependent distributions.

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      "source": "Springer", 
      "value": "We study the azimuthal angular decorrelations of dijet production in both proton-proton (pp) and proton-nucleus (pA) collisions. By utilizing soft-collinear effective theory, we establish the factorization and resummation formalism at the next-to-leading logarithmic accuracy for the azimuthal angular decorrelations in the back-to-back limit in pp collisions. We propose an approach where the nuclear modifications to dijet production in pA collisions are accounted for in the nuclear modified transverse momentum dependent parton distribution functions (nTMDPDFs), which contain both collinear and transverse dynamics. This approach naturally generalizes the well-established formalism related to the nuclear modified collinear parton distribution functions (nPDFs). We demonstrate strong consistency between our methodology and the CMS measurements in both pp and pA collisions, and make predictions for dijet production in the forward rapidity region in pA collisions at LHC kinematics and for mid-rapidity kinematics at sPHENIX. Throughout this paper, we focus on the application of this formalism to a simultaneous fit to both collinear and transverse momentum dependent contributions to the transverse momentum dependent distributions."
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Published on:
03 October 2023
Publisher:
Springer
Published in:
Journal of High Energy Physics , Volume 2023 (2023)
Issue 10
Pages 1-27
DOI:
https://doi.org/10.1007/JHEP10(2023)013
arXiv:
2306.09317
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: