Open Access

Transverse energy-energy correlator for vector boson-tagged hadron production in $p p$ and $p A$ collisions

Zhong-Bo Kang ^1,2,3,*, Sookhyun Lee^4,5,†, Jani Penttala ^1,2,‡, Fanyi Zhao^6,§, and Yiyu Zhou ^7,8,9,1,∥

¹Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
²Mani L. Bhaumik Institute for Theoretical Physics, University of California, Los Angeles, California 90095, USA
³Center for Frontiers in Nuclear Science, Stony Brook University, Stony Brook, New York 11794, USA
⁴Physics Department, University of Tennessee, Knoxville, Tennessee 37996, USA
⁵Physics Department, University of Michigan, Ann Arbor, Michigan 48109, USA
⁶Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
⁷Department of Physics, University of Turin, via Pietro Giuria 1, I-10125 Torino, Italy
⁸Key Laboratory of Atomic and Subatomic Structure and Quantum Control (MOE), Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China
⁹Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Guangdong Provincial Key Laboratory of Nuclear Science, Southern Nuclear Science Computing Center, South China Normal University, Guangzhou 510006, China

^*Contact author: zkang@physics.ucla.edu
^†Contact author: shlee@bnl.gov
^‡Contact author: janipenttala@physics.ucla.edu
^§Contact author: fanyi@mit.edu
^∥Contact author: yiyu.zhou@unito.it

Phys. Rev. D 112, 014012 – Published 7 July, 2025

DOI: https://doi.org/10.1103/1djw-8zrh

Abstract

We investigate the transverse energy-energy correlator (TEEC) event-shape observable for back-to-back $γ + h$ and $Z + h$ production in both $p p$ and $p A$ collisions. Our study incorporates nuclear modifications into the transverse-momentum dependent (TMD) factorization framework, with resummation up to next-to-leading logarithmic accuracy, for TEEC as a function of the variable $τ = (1 + \cos ϕ) / 2$ , where $ϕ$ is the azimuthal angle between the vector boson and the final hadron. We analyze the nuclear modification factor $R_{p A}$ in $p Au$ collisions at Relativistic Heavy Ion Collider and $p Pb$ collisions at the Large Hadron Collider. Our results demonstrate that the TEEC observable is a sensitive probe for nuclear modifications in TMD physics. Specifically, the changes in the $τ$ -distribution shape provide insights into transverse momentum broadening effects in large nuclei, while measurements at different rapidities allow us to explore nuclear modifications in the collinear component of the TMD parton distribution functions in nuclei.

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Phys. Rev. D 112, 014012– Published 7 July, 2025

Vol. 112, Iss. 1 — 1 July 2025

Received 11 October 2024
Accepted 9 June 2025

DOI: https://doi.org/10.1103/1djw-8zrh

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Transverse energy-energy correlator for vector boson-tagged hadron production in $p p$ and $p A$ collisions

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Transverse energy-energy correlator for vector boson-tagged hadron production in pp and pA collisions

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Transverse energy-energy correlator for vector boson-tagged hadron production in $p p$ and $p A$ collisions