Measurement of χc1(3872) production in proton-proton collisions at s√ = 8 and 13 TeV

• Main Authors: Aaij, R. (Author), Abdelmotteleb, A. S. W. (Author), Abellán Beteta, C. (Author), Abudinen Gallego, F. J. (Author), Ackernley, T. (Author), Adeva, B. (Author), Adinolfi, M. (Author), Afsharnia, H. (Author), Agapopoulou, C. (Author), Aidala, C. A. (Author), Aiola, S. (Author), Ajaltouni, Z. (Author), Akar, S. (Author), Albrecht, J. (Author), Alessio, F. (Author), Alexander, M. (Author), Alfonso Albero, A. (Author), Aliouche, Z. (Author), Alkhazov, G. (Author)
• Format: Article
• Language: English
• Published: Springer Berlin Heidelberg, 2022-01-31T17:50:35Z.
• Subjects: Article
• Online Access: Get fulltext

Abstract The production cross-section of the χc1(3872) state relative to the ψ(2S) meson is measured using proton-proton collision data collected with the LHCb experiment at centre-of-mass energies of s $$ \sqrt{s} $$ = 8 and 13 TeV, corresponding to integrated luminosities of 2.0 and 5.4 fb−1, respectively. The two mesons are reconstructed in the J/ψπ+π− final state. The ratios of the prompt and nonprompt χc1(3872) to ψ(2S) production cross-sections are measured as a function of transverse momentum, pT, and rapidity, y, of the χc1(3872) and ψ(2S) states, in the kinematic range 4 < pT < 20 GeV/c and 2.0 < y < 4.5. The prompt ratio is found to increase with pT, independently of y. For the prompt component, the double ratio of the χc1(3872) and ψ(2S) production cross-sections between 13 and 8 TeV is observed to be consistent with unity, independent of pT and centre-of-mass energy.