TY - JOUR
T1 - Measurements of ψ(2S) and χc1(3872) production within fully reconstructed jets
AU - Zunica, G.
AU - Zuliani, D.
AU - Zou, Q.
AU - Zhuo, J.
AU - Zhukov, V.
AU - Zhu, X.
AU - Zhu, X.
AU - Zhu, L. Z.
AU - Zhovkovska, V.
AU - Zhou, Y.
AU - Zhou, X.
AU - Zhou, T.
AU - Zheng, Y.
AU - Zheng, X. Z.
AU - Zheng, S. Z.
AU - Zhelezov, A.
AU - Zharkova, A.
AU - Zhao, Y.
AU - Zhang, Y. Z.
AU - Zhang, Y.
AU - Zhang, S.
AU - Zhang, S.
AU - Zhang, L.
AU - Zhang, J.
AU - Zhang, D.
AU - Zhang, C.
AU - Zeng, M.
AU - Zeng, C.
AU - Zenesini, F.
AU - Zdybal, M.
AU - Zavertyaev, M.
AU - Zaffaroni, E.
AU - Yuan, Y.
AU - Yuan, X.
AU - Yu, J.
AU - Yu, C. Y.
AU - Yin, X.
AU - Yin, H.
AU - Yeung, H.
AU - Yeroshenko, V.
AU - Yang, Z.
AU - Yang, Z.
AU - Yang, Y.
AU - Yang, X.
AU - Yang, S.
AU - Yang, K.
AU - Yang, D.
AU - Xu, Z.
AU - Xu, Z.
AU - Xu, Z.
AU - LHCb collaboration
AU - Lucio Martinez, Miriam
AU - da silva Bolognani, Carolina
AU - Cámpora Pérez, Daniel Hugo
AU - Chiotopoulos, Xenofon
AU - de Vries, Jacco
AU - Merk, Marcel
AU - Nicotra, Davide
AU - Onderwater, Gerco
AU - Pawley, Chris
AU - Vos, Keri
N1 - Funding Information:
We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MCID/IFA (Romania); MICIU and AEI (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), and Polish WLCG (Poland). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from ARC and ARDC (Australia); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. & Tech. Program of Guangzhou (China); Minciencias (Colombia); EPLANET, Marie Sk\u0142odowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and R\u00E9gion Auvergne-Rh\u00F4ne-Alpes (France); AvH Foundation (Germany); ICSC (Italy); Severo Ochoa and Mar\u00EDa de Maeztu Units of Excellence, GVA, XuntaGal, GENCAT, InTalent-Inditex and Prog. Atracci\u00F3n Talento CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom).
Publisher Copyright:
© The Author(s) 2025.
PY - 2025/5/1
Y1 - 2025/5/1
N2 - This paper presents the first measurement of ψ(2S) and χc1(3872) meson production within fully reconstructed jets. Each quarkonium state (tag) is reconstructed via its decay to the J/ψ(→μ+μ-)π+π- final state in the forward region using proton-proton collision data collected by the LHCb experiment at the center-of-mass-energy of 13TeV in 2016, corresponding to an integrated luminosity of 1.64\,fb-1. The fragmentation function, presented as the ratio of the quarkonium-tag transverse momentum to the full jet transverse momentum (pT(tag)/pT(jet)), is measured differentially in pT(jet) and pT(tag) bins. The distributions are separated into promptly produced quarkonia from proton-proton collisions and quarkonia produced from displaced b-hadron decays. While the displaced quarkonia fragmentation functions are in general well described by parton-shower predictions, the prompt quarkonium distributions differ significantly from fixed-order non-relativistic QCD (NRQCD) predictions followed by a QCD parton shower.
AB - This paper presents the first measurement of ψ(2S) and χc1(3872) meson production within fully reconstructed jets. Each quarkonium state (tag) is reconstructed via its decay to the J/ψ(→μ+μ-)π+π- final state in the forward region using proton-proton collision data collected by the LHCb experiment at the center-of-mass-energy of 13TeV in 2016, corresponding to an integrated luminosity of 1.64\,fb-1. The fragmentation function, presented as the ratio of the quarkonium-tag transverse momentum to the full jet transverse momentum (pT(tag)/pT(jet)), is measured differentially in pT(jet) and pT(tag) bins. The distributions are separated into promptly produced quarkonia from proton-proton collisions and quarkonia produced from displaced b-hadron decays. While the displaced quarkonia fragmentation functions are in general well described by parton-shower predictions, the prompt quarkonium distributions differ significantly from fixed-order non-relativistic QCD (NRQCD) predictions followed by a QCD parton shower.
U2 - 10.1140/epjc/s10052-025-13852-4
DO - 10.1140/epjc/s10052-025-13852-4
M3 - Article
SN - 1434-6044
VL - 85
JO - European Physical Journal C
JF - European Physical Journal C
IS - 5
M1 - 562
ER -