Study of the D0p amplitude in Λ0b→D0pπ− decays

• Published in: The journal of high energy physics no. 2017
• Main Authors: Aaij, R., Beaucourt, L., Chefdeville, M., Decamp, D., Déléage, N., Ghez, P., Marchand, J.-F., Minard, M.-N., Pietrzyk, B., t'Jampens, S., Tisserand, V., Tournefier, E., Xu, Z., Arnau Romeu, J., Aslanides, E., Cogan, J., Bruyn, K. De, Legac, R., Leroy, O., Mancinelli, G., Martin, M., Mordà, A., Serrano, J., Tayduganov, A., Tsaregorodtsev, A., Ajaltouni, Z.J., Baalouch, M., Cogneras, E., Deschamps, O., Gazzoni, G., Hadjivasiliou, C., Henrard, P., Kozeiha, M., Lefèvre, R., Maratas, J., Monteil, S., Perret, P., Vernet, M.
• Format: Journal Article
• Language: English
• Published: Springer Verlag (Germany) 05.05.2017
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 1029-8479
• DOI: 10.1007/JHEP05(2017)030

An amplitude analysis of the decay Λ0b→D0pπ− is performed in the part of the phase space containing resonances in the D0p 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 Λ+c states that decay into D0p is studied. The masses, widths and quantum numbers of the Λc(2880)+ and Λc(2940)+ resonances are measured. The constraints on the spin and parity for the Λc(2940)+ state are obtained for the first time. A near-threshold enhancement in the D0p amplitude is investigated and found to be consistent with a new resonance, denoted the Λc(2860)+, of spin 3/2 and positive parity.