The production of J/psi is measured as a function of charged-particle multiplicity at forward rapidity in proton-proton (pp) collisions at center-of-mass energies root s = 5.02 and 13 TeV. The J/psi mesons are reconstructed via their decay into dimuons in the rapidity interval (2.5 < y < 4.0), whereas the charged-particle multiplicity density (dN(ch)/d eta) is measured at midrapidity (vertical bar eta vertical bar < 1). The production rate as a function of multiplicity is reported as the ratio of the yield in a given multiplicity interval to the multiplicity-integrated one. This observable shows a linear increase with charged-particle multiplicity normalized to the corresponding average value for inelastic events (dN(ch)/d eta/< dN(ch)/d eta >), at both the colliding energies. Measurements are compared with available ALICE results at midrapidity and theoretical model calculations. First measurement of the mean transverse momentum (< p(T)>) of J/psi in pp collisions exhibits an increasing trend as a function of dN(ch)/d eta/< dN(ch)/d eta > showing a saturation towards high charged-particle multiplicities.
Forward rapidity J/psi production as a function of charged-particle multiplicity in pp collisions at root s=5.02 and 13 TeV
Alessandro, B.;Alici, A.;Aziz, S.;Banerjee, D.;Baruffaldi, F.;Basu, S.;Bearden, I. G.;Bellini, F.;Biswas, S.;Bruno, G. E.;Colella, D.;Contin, G.;Das, P.;Das, P.;Dash, S.;De Caro, A.;De Falco, A.;Deb, S.;Evans, D.;Faggin, M.;Faivre, J.;Giacalone, M.;Giubilato, P.;Harris, J. W.;Janik, M. A.;Jung, J.;Kim, J. S.;Kundu, S.;Lunardon, M.Membro del Collaboration Group
;Martinez M.;Micheletti, L.;Negru, A.;Pagano, D.;Petrov, V;Rehman, A.;Richter, M.;Riggi, F.;Roy, A.;Rui, R.;Sharma, A.;Sinha, T.;Soramel, F.;Stocco, D.;Swain, S.;Szarka, I;Terrevoli, C.;Thomas, D.;Trogolo, S.;Turrisi, R.;Uras, A.;Vercellin, E.;Wagner, B.;Wang, C.;Wright, J. R.;Wu, W.;Zhou, Y.;Zhu, J.;
2022
Abstract
The production of J/psi is measured as a function of charged-particle multiplicity at forward rapidity in proton-proton (pp) collisions at center-of-mass energies root s = 5.02 and 13 TeV. The J/psi mesons are reconstructed via their decay into dimuons in the rapidity interval (2.5 < y < 4.0), whereas the charged-particle multiplicity density (dN(ch)/d eta) is measured at midrapidity (vertical bar eta vertical bar < 1). The production rate as a function of multiplicity is reported as the ratio of the yield in a given multiplicity interval to the multiplicity-integrated one. This observable shows a linear increase with charged-particle multiplicity normalized to the corresponding average value for inelastic events (dN(ch)/d eta/< dN(ch)/d eta >), at both the colliding energies. Measurements are compared with available ALICE results at midrapidity and theoretical model calculations. First measurement of the mean transverse momentum (< p(T)>) of J/psi in pp collisions exhibits an increasing trend as a function of dN(ch)/d eta/< dN(ch)/d eta > showing a saturation towards high charged-particle multiplicities.Pubblicazioni consigliate
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