Study of excited $\Lambda_\mathrmb^0$ states decaying to $\Lambda_\mathrmb^0\pi^+\pi^-$ in proton-proton collisions at $\sqrts=$ 13 TeV
Journal
Phys. Lett. B
Journal Volume
803
Pages
135345
Date Issued
2020
Author(s)
Abstract
A study of excited 0 b baryons is reported, based on a data sample collected in 2016-2018 with the CMS detector at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of up to 140 fb -1 . The existence of four excited 0 b states: 0 b (5912) 0 , 0 b (5920) 0 , 0 b (6146) 0 , and 0 b (6152) 0 in the 0 b + -mass spectrum is confirmed, and their masses are measured. The 0 b + -mass distribution exhibits a broad excess of events in the region of 6040-6100 MeV, whose origin cannot be discerned with the present data.
Type
journal article