Evidence for the two-body charmless baryonic decay B+→pΛ

• Published in: The journal of high energy physics 2017-04, Vol.2017 (4)
• Main Authors: Alkhazov, G., Romeu, J. Arnau, Baalouch, M., Barschel, C., Barsuk, S., Batozskaya, V., Belloli, N., Belyaev, I., Blake, T., Borsato, M., Buchanan, E., Akiba, K. Carvalho, Casse, G., Cojocariu, L., Collins, P., Coombs, G., Crocombe, A., D’Ambrosio, C., De Aguiar Francisco, O., De Paula, L., Deckenhoff, M., Derkach, D., Dungs, K., Durante, P., Ebert, M., Egorychev, V., Fazzini, D., Fiorini, M., Fohl, K., Frei, C., Gallorini, S., Pardiñas, J. García, Gascon, D., Gersabeck, E., Giubega, L., Hamilton, B., Harnew, N., Harrison, J., Henrard, P., Hill, D., Hulsbergen, W., Idzik, M., Jaeger, A., Jiang, F., Jost, B., Kvaratskheliya, T., Lai, A., Leroy, O., Lupton, O., Maev, O., Malinin, A., Mancinelli, G., Benito, C. Marin, Santos, D. Martinez, Mauri, A., Maurin, B., Merk, M., Monteil, S., Mountain, R., Müller, D., Owen, P., Panman, J., Pappalardo, L. L., Passaleva, G., Patrignani, C., Playfer, S., Navarro, A. Puig, Redi, F., dos Reis, A. C., Renaudin, V., Silva, J. J. Saborido, Sadykhov, E., Saitta, B., Santacesaria, R., Satta, A., Schmidt, B., Schubert, K., Schubiger, M., Schune, M.-H., Serra, N., Shears, T., Skwarnicki, T., Smith, E., Smith, I. T., Stahl, S., Stefko, P., Stemmle, S., Stenyakin, O., Straticiuc, M., Tolk, S., Trisovic, A., Valat, S., Volkov, V., Weiden, A., Wicht, J., Yao, Y., Yushchenko, O., Zhang, L., Zhang, Y., Zheng, Y.
• Format: Article
• Language: English
• Subjects: Baryons; Classical and Quantum Gravitation; Decay; Elementary Particles; High energy physics; Large Hadron Collider; Luminosity; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Experimental Physics; Relativity Theory; String Theory
• ISSN: 1029-8479
• DOI: 10.1007/JHEP04(2017)162

A bstract A search for the rare two-body charmless baryonic decay B + → p Λ ¯ is performed with pp collision data, corresponding to an integrated luminosity of 3 fb −1 , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. An excess of B + → p Λ ¯ candidates with respect to background expectations is seen with a statistical significance of 4.1 standard deviations, and constitutes the first evidence for this decay. The branching fraction, measured using the B +  →  K S 0 π + decay for normalisation, is ℬ B + → p Λ ¯ = 2 . 4 − 0.8 + 1.0 ± 0.3 × 1 0 − 7 , where the first uncertainty is statistical and the second systematic.