TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Garcia Martin, L. M.
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  - 2020
DA  - 2020//
TI  - Observation of a new baryon state in the Lambda(0)(b)pi(+)pi(-) mass spectrum
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 136
EP  - 26pp
VL  - 06
IS  - 6
PB  - Springer
KW  - B physics
KW  - Hadron-Hadron scattering (experiments)
KW  - Heavy quark production
KW  - Spectroscopy
AB  - A new baryon state is observed in the Lambda(0)(b)pi(+)pi(-) mass spectrum with high significance using a data sample of pp collisions, collected with the LHCb detector at centre-of-mass energies root s = 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb(-1). The mass and natural width of the new state are measured to be m = 6072.3 +/- 2.9 +/- 0.6 +/- 0.2 MeV, Gamma = 72 +/- 11 +/- 2 MeV, where the first uncertainty is statistical and the second systematic. The third uncertainty for the mass is due to imprecise knowledge of the Lambda(0)(b) baryon mass. The new state is consistent with the first radial excitation of the Lambda(0)(b) baryon, the Lambda(b)(2S)(0) resonance. Updated measurements of the masses and the upper limits on the natural widths of the previously observed Lambda(b)(5912)(0) and Lambda(b)(5920)(0) states are also reported.
SN  - 1029-8479
UR  - https://arxiv.org/abs/2002.05112
UR  - https://doi.org/10.1007/JHEP06(2020)136
DO  - 10.1007/JHEP06(2020)136
LA  - English
N1  - WOS:000545673000001
ID  - LHCbCollaborationAaij_etal2020
ER  -