TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Henry, L.
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
AU  - Sanchez Mayordomo, C.
PY  - 2021
DA  - 2021//
TI  - Observation of Multiplicity Dependent Prompt chi(c1) (3872) and psi (2S) Production in pp Collisions
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 092001
EP  - 11pp
VL  - 126
IS  - 9
PB  - Amer Physical Soc
AB  - The production of chi(c1)(3872) and psi(2S) hadrons is studied as a function of charged particle multiplicity in pp collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2 fb(-1). For both states, the fraction that is produced promptly at the collision vertex is found to decrease as charged particle multiplicity increases. The ratio of chi(c1) (3872) to psi(2S) cross sections for promptly produced particles is also found to decrease with multiplicity, while no significant dependence on multiplicity is observed for the equivalent ratio of particles produced away from the collision vertex in b-hadron decays. This behavior is consistent with a calculation that models the chi(c1) (3872) structure as a compact tetraquark. Comparisons with model calculations and implications for the binding energy of the chi(c1)(3872) state are discussed.
SN  - 0031-9007
UR  - https://arxiv.org/abs/2009.06619
UR  - https://doi.org/10.1103/PhysRevLett.126.092001
DO  - 10.1103/PhysRevLett.126.092001
LA  - English
N1  - WOS:000627618200008
ID  - LHCbCollaborationAaij_etal2021
ER  -