European Organization for Nuclear Research (cern)

Marianna Adinolfi,Ziad Ajaltouni, Simon Akar,Johannes Albrecht, Georgy Alkhazov, Paula Alvarez Cartelle,Sandra Amato, Silvia Amerio,Yasmine Amhis,Lucio Anderlini,Elie Aslanides, Colin Barschel, S. Barsuk, John Beddow, Julien Cogan, Eric Cogneras, Fernando Rodrigues,C. Fitzpatrick, Tomasz Fiutowski, Frederic Fleuret, Clara Gaspar, Laura Gavardi, Giulio Gazzoni, David Gerick, Samuele Giani, Álvaro Gomes,Eugeni Grauges, Elena Graverini, Alexandru Grecu

semanticscholar（2016）

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摘要

The Λb → Λφ decay is observed using data corresponding to an integrated luminosity of 3.0 fb−1 recorded by the LHCb experiment. The decay proceeds at leading order via a b → sss loop transition and is therefore sensitive to the possible presence of particles beyond the Standard Model. A first observation is reported with a significance of 5.9 standard deviations. The value of the branching fraction is measured to be (5.18 ± 1.04 ± 0.35 +0.67 −0.62) × 10−6, where the first uncertainty is statistical, the second is systematic, and the third is related to external inputs. Triple-product asymmetries are measured to be consistent with zero. Published in Phys. Lett. B759 (2016) 282 c © CERN on behalf of the LHCb collaboration, licence CC-BY-4.0. †Authors are listed at the end of this letter. ar X iv :1 60 3. 02 87 0v 2 [ he pex ] 7 J un 2 01 6

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