Publication

First Observation of the Doubly Charmed Baryon Decay Xi(++)(cc) -> Xi(+)(c)pi(+)

Olivier Schneider, Tatsuya Nakada, Yasmine Sara Amhis, Michel De Cian, Federico Leo Redi, Vladimir Macko, Pietro Marino, Tara Nanut, Violaine Bellée, Pavol Stefko, Alessio Ferrari, Guillaume Max Pietrzyk, Luca Pescatore, Preema Rennee Pais, Guido Andreassi, François Fleuret, Maxime Schubiger, Chitsanu Khurewathanakul, Christoph Frei, Greig Alan Cowan, Vladislav Balagura, Ian William Marison, Jessica Prisciandaro, Mark Tobin, Mirco Dorigo, Sebastiana Gianì, Conor Thomas Fitzpatrick, Arnaud Merlin Gauthey, Matthieu Philippe Luther Marinangeli, Tommaso Colombo, Marco Calvi, Daniel Gallichan, Mai Tu Xuan, Marilisa Neri, Jared Heath Delcamp, Severin Stähly, Michael Thompson McCann, Simon Van Mulders, Vincenzo Battista, Giovanni Veneziano, Matteo Fontana, Benedikt Sebastian Braun, Alexandra Bondarenko, Brice Emile Maurin, Nathalie Sophie Adeline Serra, Léonard Yannick Maurice Eymann, Adriano Pastore, Valérie Jeanne Thérèse Renaudin-Schouler, Luc Henry, Xiao Yuan, Laia Castilla Amorós, Craig Matthew Smith, Basile Schäli, Nandita Aggarwal, Sattar Akbari Nakhjavani, Gang Yu, Kévin Müller, Jordy Daniel Müller
2018
Journal Articles

Abstract

The doubly charmed baryon decay Xi(++)(cc) -> Xi(+)(c)pi(+) is observed for the first time, with a statistical significance of 5.9 sigma, confirming a recent observation of the baryon in the Lambda K-+(c)-pi(+)pi(+) final state. The data sample used corresponds to an integrated luminosity of 1.7 fb(-1), collected by the LHCb experiment in pp collisions at a center-of-mass energy of 13 TeV. The Xi(++)(cc) mass is measured to be 3620.6 +/- 1.5(stat) +/- 0.4(syst) +/- 0.3(Xi(+)(c)) MeV/c(2) and is consistent with the previous result. The ratio of branching fractions between the decay modes is measured to be [B(Xi(++)(cc) -> Xi(+)(c)pi(+)) x B(Xi(+)(c) -> pK(-)pi(+))]/[B(Xi(++)(cc) -> Lambda K-+(c)-pi(+)pi(+)) x B(Lambda(+)(c) -> pK(-)pi(+))] = 0.035 +/- 0.009 (stat) +/- 0.003 (syst).

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First Observation of the Doubly Charmed Baryon Decay Xi(++)(cc) -> Xi(+)(c)pi(+)

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