Model-independent evidence for J/ψp contributions to Λ0b→J/ψpK− decays

R. Aaij L. Beaucourt 1 M. Chefdeville 1 D. Decamp 1 N. Déléage 1 P. Ghez 1 J.-P. Lees 1 J.-F. Marchand 1 M.-N. Minard 1 B. Pietrzyk 1 S. t'Jampens 1 V. Tisserand 1 E. Tournefier 1 S. Akar 2 E. Aslanides 2 J. Cogan 2 K. De Bruyn 2 W. Kanso 2 R. Legac 2 O. Leroy 2 G. Mancinelli 2 M. Martin 2 A. Mordà 2 J. Serrano 2 A. Tayduganov 2 A. Tsaregorodtsev 2 Y. Amhis 3 S. Barsuk 3 F. Fleuret 3 O. Kochebina 3 J. Lefrançois 3 Y. Li 3 F. Machefert 3 G. Manca 3 L.M. Massacrier 3 R. Quagliani 3 V. Renaudin 3 P. Robbe 3 M.-H. Schune 3 A. Vallier 3 B. Viaud 3 G. Wormser 3 Z.J. Ajaltouni 4 M. Baalouch 4 E. Cogneras 4 O. Deschamps 4 I. El Rifai 4 G. Gazzoni 4 M. Grabalosa Gándara 4 P. Henrard 4 M. Hoballah 4 M. Kozeiha 4 R. Lefèvre 4 J. Maratas 4 S. Monteil 4 V. Niess 4 P. Perret 4
1 LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules - Laboratoire d'Annecy de Physique des Particules
2 CPPM - Centre de Physique des Particules de Marseille
3 LAL - Laboratoire de l'Accélérateur Linéaire
4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
Abstract : The data sample of Λ0b→J/ψpK− decays acquired with the LHCb detector from 7 and 8~TeV pp collisions, corresponding to an integrated luminosity of 3 fb−1, is inspected for the presence of J/ψp or J/ψK− contributions with minimal assumptions about K−p contributions. It is demonstrated at more than 9 standard deviations that Λ0b→J/ψpK− decays cannot be described with K−p contributions alone, and that J/ψp contributions play a dominant role in this incompatibility. These model-independent results support the previously obtained model-dependent evidence for P+c→J/ψp charmonium-pentaquark states in the same data sample.
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Journal articles
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Submitted on : Wednesday, April 20, 2016 - 9:31:44 AM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Model-independent evidence for J/ψp contributions to Λ0b→J/ψpK− decays. Physical Review Letters, American Physical Society, 2016, 117, pp.082002 ⟨10.1103/PhysRevLett.117.082002 ⟩. ⟨in2p3-01304639⟩

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