Study of the $D^{0}p$ amplitude in ${\Lambda }_b^0\to D^{0}p{\pi }^{-}$ decays

Abstract

An amplitude analysis of the decay ${\Lambda }_b^0\to D^{0}p{\pi }^{-}$ 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 ${\Lambda }_c^{+}$ states that decay into $D^{0}p$ is studied. The masses, widths and quantum numbers of the ${\Lambda }_c(2880{)}^{+}$ and ${\Lambda }_c(2940{)}^{+}$ resonances are measured. The constraints on the spin and parity for the ${\Lambda }_c(2940{)}^{+}$ 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 ${\Lambda }_c(2860{)}^{+}$, 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

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