Measurement of $χ_{c1}$(3872) production in proton-proton collisions at $\sqrt{s}$ = 8 and 13 TeV

• Published in: The journal of high energy physics Vol. 2022; no. 1
• Main Authors: Barsuk, S., Batsukh, B., Blanc, F., Boente Garcia, O., Carus, L., Carvalho Akiba, K., Chobanova, V., Congedo, L., Corredoira, I., Dalseno, J., D’Ambrosio, C., Dedu, V., Dembinski, H. -P., Deschamps, O., Di Cicco, A., Douglas, L., Dziurda, A., Fernez, A. D., Ferrari, F., Filippov, S., Franco Sevilla, M., Gan, Y., Gerick, D., Giemza, H. K., Gorelov, I. V., Greeven, L. M., Guz, Y., Halewood-leagas, T., Hollitt, S. E., Huang, X., Hushchyn, M., Idzik, M., Ilten, P., Ishteev, A., Jacobsson, R., Jevtic, V., Jurik, N., Kenzie, M., Kirsebom, V. S., Kitouni, O., Klaver, S., Koppenburg, P., Kravchenko, P., Krzemien, W., Kunde, G. J., Lane, R., Liang, X., Lobo Salvia, A., Lucchesi, D., Luppi, E., Lupton, O., Mackowiak, P., McNulty, R., Melnychuk, D., Millard, E., Morello, G., Naik, P., O’Hanlon, D. P., Oldeman, R., Palutan, M., Pappalardo, L. L., Patrignani, C., Petrolini, A., Pisani, F., Polci, F., Promberger, L., Pullen, H., Rama, M., Ramos Pernas, M., Rangel, M. S., Redi, F., Rinnert, K., Ruf, T., Santimaria, M., Santovetti, E., Saur, M., Scherl, S., Schindler, H., Schmidt, B., Schulte, S., Schwemmer, R., Shmanin, E., Skwarnicki, T., Snoch, A., Solovev, A., Souza De Almeida, F. L., Swallow, P. N., Szymanski, M., Trippl, C., Ustyuzhanin, A., Vagnoni, V., Van Dijk, M., Vazquez Regueiro, P., Veltri, M., Wang, M., Whitehead, M., Wilson, F. F., Xiao, D., Yang, Z., Yin, H.
• Format: Journal Article
• Language: English
• Published: United States Springer Nature 24.01.2022
• Subjects: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; hadron-hadron scattering
• ISSN: 1029-8479; 1029-8479

The production cross-section of the $χ_{c1}$(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 $\sqrt{s}$ = 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 $χ_{c1}$(3872) to $ψ(2S)$ production cross-sections are measured as a function of transverse momentum, $ρ_T$, and rapidity, y, of the $χ_{c1}$(3872) and $ψ(2S)$ states, in the kinematic range 4 < $ρ_T$ < 20 GeV/c and 2.0< y < 4.5. The prompt ratio is found to increase with $ρ_T$, independently of y. For the prompt component, the double ratio of the $χ_{c1}$(3872) and $ψ(2S)$ production cross-sections between 13 and 8 TeV is observed to be consistent with unity, independent of $ρ_T$ and centre-of-mass energy.