Observation of the Λb0→Λc+K+K−π− decay
Aaij R., Abellán Beteta C., Ackernley T., Adeva B., Adinolfi M., Afsharnia H., Aidala CA., Aiola S., Ajaltouni Z., Akar S., Albrecht J., Alessio F., Alexander M., Alfonso Albero A., Aliouche Z., Alkhazov G., Alvarez Cartelle P., Amato S., Amhis Y., An L., Anderlini L., Andreianov A., Andreotti M., Archilli F., Artamonov A., Artuso M., Arzymatov K., Aslanides E., Atzeni M., Audurier B., Bachmann S., Bachmayer M., Back JJ., Baker S., Baladron Rodriguez P., Balagura V., Baldini W., Baptista Leite J., Barlow RJ., Barsuk S., Barter W., Bartolini M., Baryshnikov F., Basels JM., Bassi G., Batsukh B., Battig A., Bay A., Becker M., Bedeschi F., Bediaga I., Beiter A., Belavin V., Belin S., Bellee V., Belous K., Belov I., Belyaev I., Bencivenni G., Ben-Haim E., Berezhnoy A., Bernet R., Berninghoff D., Bernstein HC., Bertella C., Bertholet E., Bertolin A., Betancourt C., Betti F., Bettler MO., Bezshyiko I., Bhasin S., Bhom J., Bian L., Bieker MS., Bifani S., Billoir P., Birch M., Bishop FCR., Bizzeti A., Bjørn M., Blago MP., Blake T., Blanc F., Blusk S., Bobulska D., Boelhauve JA., Boente Garcia O., Boettcher T., Boldyrev A., Bondar A., Bondar N., Borghi S., Borisyak M., Borsato M., Borsuk JT., Bouchiba SA., Bowcock TJV., Boyer A., Bozzi C.
© 2021 The Author(s) The Λb0→Λc+K+K−π− decay is observed for the first time using a data sample of proton-proton collisions at centre-of-mass energies of s=7 and 8TeV collected by the LHCb detector, corresponding to an integrated luminosity of 3fb−1. The ratio of branching fractions between the Λb0→Λc+K+K−π− and the Λb0→Λc+Ds− decays is measured to be [Formula presented] where the first uncertainty is statistical, the second systematic and the third is due to the knowledge of the Ds−→K+K−π− branching fraction. No structure on the invariant mass distribution of the Λc+K+ system is found, consistent with no open-charm pentaquark signature.