Study of the $D^0 p$ amplitude in $Î_b^0\to D^0 p Ï^-$ decays
arXiv:1701.07873 · doi:10.1007/JHEP05(2017)030
Abstract
An amplitude analysis of the decay $Î_b^0\to D^0 p Ï^-$ is performed in the part of the phase space containing resonances in the $D^0 p$ channel. The study is based on a data sample corresponding to an integrated luminosity of 3.0 fb$^{-1}$ of $pp$ collisions recorded by the LHCb experiment. The spectrum of excited $Î_c^+$ states that decay into $D^0 p$ is studied. The masses, widths and quantum numbers of the $Î_c(2880)^+$ and $Î_c(2940)^+$ resonances are measured. The constraints on the spin and parity for the $Î_c(2940)^+$ state are obtained for the first time. A near-threshold enhancement in the $D^0 p$ amplitude is investigated and found to be consistent with a new resonance, denoted the $Î_c(2860)^+$, of spin $3/2$ and positive parity.
Replaced with version published in JHEP. All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-061.html