PreprintCC BY 4.0HAL
First measurement of the ratio of ψ(2S)-to-J/ψ inclusive production in pAr and pp collisions at √(sNN) =113 GeV with SMOG2
Abstract
A measurement of the ψ(2S)-to-J/ψ production cross-section ratio is performed in proton-argon (pAr) and proton-proton (pp) collisions in fixed-target mode at √(sNN)=113 GeV. Data samples were collected by the LHCb experiment during argon and hydrogen gas injections in the SMOG2 storage cell, resulting in pAr and pp collisions, respectively. The ψ(2S)-to-J/ψ production cross-section ratio is measured as a function of the charmonium transverse momentum, pT, and rapidity in the centre-of-mass system, y*. The ψ(2S)-to-J/ψ ratio in pAr collisions over that in pp collisions is measured to be 0.90 ± 0.04 ± 0.02 for −2.3<y*<0.0 and 0<pT<8GeV/c, indicating the emergence of nuclear effects in the pAr system. This study acts as a baseline for the interpretation of future measurements with larger systems accessible by the LHCb experiment.
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BibTeX
@misc{aaij2026first,
title = {{First measurement of the ratio of $ψ(2S)$-to-$J/ψ$ inclusive production in $p\mathrmAr$ and $pp$ collisions at $\sqrts_\mathrmNN =113\,\mathrmGeV$ with SMOG2}},
author = {Roel Aaij and Mohammed Abdelfatah and Ahmed Sameh Wagih Abdelmotteleb and Carlos Abellan Beteta and Fernando Jesus Abudinén and Thomas Ackernley and Ayomide Matthew Adefisoye and Bernardo Adeva and Marco Adinolfi and Patrik Harri Adlarson and Christina Agapopoulou and Christine Angela Aidala and Simon Akar and Kazuyoshi Akiba and Hussain Hassan A Al Saleh and Pietro Albicocco and Johannes Albrecht and Ramunas Aleksiejunas and Federico Alessio and Paula Alvarez Cartelle and Sandra Amato and Jake Lewis Amey and Yasmine Amhis and Zachariah Benjamin Amos and Liupan An and Lucio Anderlini and Pasquale Andreola and Mirco Andreotti and Sergio Andres Estrada and Alessia Anelli and Dong Ao and Carolina Arata and Flavio Archilli and Zaratsyan Areg and Matteo Argenton and Sergio Arguedas Cuendis and Lisa Arnone and Marina Artuso and Elie Aslanides and Rita Ataíde da Silva and Michele Atzeni and Benjamin Audurier and Juliette Authier and David Bacher and Irene Bachiller Perea and Sebastian Bachmann and Marie Bachmayer and John Back and Maoze Bai and Ziyu Bai and Vladislav Balagura and Anna Balboni and Wander Baldini and Zachary Baldwin and Luca Balzani and Haoran Bao and Juan Baptista de Souza Leite and Carlos Javier Barbero Pretel and Matteo Barbetti and Ivanildo Rui Barbosa},
howpublished = {HAL},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.30534},
eprint = {2608.30534},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05759117v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - First measurement of the ratio of ψ(2S)-to-J/ψ inclusive production in pAr and pp collisions at √(s_NN) =113 GeV with SMOG2
AU - Roel Aaij
AU - Mohammed Abdelfatah
AU - Ahmed Sameh Wagih Abdelmotteleb
AU - Carlos Abellan Beteta
AU - Fernando Jesus Abudinén
AU - Thomas Ackernley
AU - Ayomide Matthew Adefisoye
AU - Bernardo Adeva
AU - Marco Adinolfi
AU - Patrik Harri Adlarson
AU - Christina Agapopoulou
AU - Christine Angela Aidala
AU - Simon Akar
AU - Kazuyoshi Akiba
AU - Hussain Hassan A Al Saleh
AU - Pietro Albicocco
AU - Johannes Albrecht
AU - Ramunas Aleksiejunas
AU - Federico Alessio
AU - Paula Alvarez Cartelle
AU - Sandra Amato
AU - Jake Lewis Amey
AU - Yasmine Amhis
AU - Zachariah Benjamin Amos
AU - Liupan An
AU - Lucio Anderlini
AU - Pasquale Andreola
AU - Mirco Andreotti
AU - Sergio Andres Estrada
AU - Alessia Anelli
AU - Dong Ao
AU - Carolina Arata
AU - Flavio Archilli
AU - Zaratsyan Areg
AU - Matteo Argenton
AU - Sergio Arguedas Cuendis
AU - Lisa Arnone
AU - Marina Artuso
AU - Elie Aslanides
AU - Rita Ataíde da Silva
AU - Michele Atzeni
AU - Benjamin Audurier
AU - Juliette Authier
AU - David Bacher
AU - Irene Bachiller Perea
AU - Sebastian Bachmann
AU - Marie Bachmayer
AU - John Back
AU - Maoze Bai
AU - Ziyu Bai
AU - Vladislav Balagura
AU - Anna Balboni
AU - Wander Baldini
AU - Zachary Baldwin
AU - Luca Balzani
AU - Haoran Bao
AU - Juan Baptista de Souza Leite
AU - Carlos Javier Barbero Pretel
AU - Matteo Barbetti
AU - Ivanildo Rui Barbosa
PY - 2026
DA - 2026/08/31
PB - HAL
DO - 10.48550/arxiv.2608.30534
UR - https://hal.science/hal-05759117v1
AB - A measurement of the ψ(2S)-to-J/ψ production cross-section ratio is performed in proton-argon (pAr) and proton-proton (pp) collisions in fixed-target mode at √(s_NN)=113 GeV. Data samples were collected by the LHCb experiment during argon and hydrogen gas injections in the SMOG2 storage cell, resulting in pAr and pp collisions, respectively. The ψ(2S)-to-J/ψ production cross-section ratio is measured as a function of the charmonium transverse momentum, p_T, and rapidity in the centre-of-mass system, y^*. The ψ(2S)-to-J/ψ ratio in pAr collisions over that in pp collisions is measured to be 0.90 ± 0.04 ± 0.02 for −2.3<y^*<0.0 and 0<p_T<8GeV/c, indicating the emergence of nuclear effects in the pAr system. This study acts as a baseline for the interpretation of future measurements with larger systems accessible by the LHCb experiment.
ER -