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Phys Rev Lett. 2014 Oct 10;113(15):152003. Epub 2014 Oct 10.

First observation of a baryonic Bc+ decay.

Aaij R, Adeva B, Adinolfi M, Affolder A, Ajaltouni Z, Akar S, Albrecht J, Alessio F, Alexander M, Ali S, Alkhazov G, Alvarez Cartelle P, Alves AA Jr, Amato S, Amerio S, Amhis Y, An L, Anderlini L, Anderson J, Andreassen R, Andreotti M, Andrews JE, Appleby RB, Aquines Gutierrez O, Archilli F, Artamonov A, Artuso M, Aslanides E, Auriemma G, Baalouch M, Bachmann S, Back JJ, Badalov A, Baldini W, Barlow RJ, Barschel C, Barsuk S, Barter W, Batozskaya V, Battista V, Bay A, Beaucourt L, Beddow J, Bedeschi F, Bediaga I, Belogurov S, Belous K, Belyaev I, Ben-Haim E, Bencivenni G, Benson S, Benton J, Berezhnoy A, Bernet R, Bettler MO, van Beuzekom M, Bien A, Bifani S, Bird T, Bizzeti A, Bjørnstad PM, Blake T, Blanc F, Blouw J, Blusk S, Bocci V, Bondar A, Bondar N, Bonivento W, Borghi S, Borgia A, Borsato M, Bowcock TJ, Bowen E, Bozzi C, Brambach T, van den Brand J, Bressieux J, Brett D, Britsch M, Britton T, Brodzicka J, Brook NH, Brown H, Bursche A, Busetto G, Buytaert J, Cadeddu S, Calabrese 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K, Xie Y, Xing Z, Xu Z, Yang Z, Yuan X, Yushchenko O, Zangoli M, Zavertyaev M, Zhang L, Zhang WC, Zhang Y, Zhelezov A, Zhokhov A, Zhong L, Zvyagin A; LHCb Collaboration.

Abstract

A baryonic decay of the B(c)(+) meson, B(c)(+) → J/ψppπ(+), is observed for the first time, with a significance of 7.3 standard deviations, in pp collision data collected with the LHCb detector and corresponding to an integrated luminosity of 3.0 fb(-1) taken at center-of-mass energies of 7 and 8 TeV. With the B(c)(+) → J/ψπ(+) decay as the normalization channel, the ratio of branching fractions is measured to be B(B(c)(+) → J/ψppπ(+))/B(B(c)(+) → J/ψπ(+)) = 0.143(-0.034)(+0.039)(stat) ± 0.013(syst). The mass of the B(c)(+) meson is determined as M(B(c)(+) = 6274.0 ± 1.8(stat) ± 0.4(syst) MeV/c(2), using the B(c)(+) → J/ψppπ(+) channel.

PMID:
25375705
DOI:
10.1103/PhysRevLett.113.152003
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