EPJ Web Conf.
Volume 126, 20164th International Conference on New Frontiers in Physics
|Number of page(s)||8|
|Published online||04 November 2016|
Observation of pentaquark resonances in Λb → J/ψK−p decays
University of Santiago de Compostela, Spain
a e-mail: Bernardo.Adeva@usc.es
Published online: 4 November 2016
LHCb has recently reported the observation of exotic structures in the J/ψp channel, in Λb → J/ψK−p decay, which we discuss here and refer to as charmoniumpentaquarkstates. The data sample corresponds to an integrated luminosity of 3.0 fb−1acquired with the LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysisof the three-body final state reproduces the two-body mass and angular distributions. Toobtain a satisfactory fit of the structures seen in the J/ψp mass spectrum, it is necessaryto include two Breit-Wigner amplitudes that each describe a resonant state. Details aregiven on the significance, and prefered quantum numbers, of these two resonances.
© The Authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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