Measurements of the Absolute Branching Fractions of $B^\pm \to K^\pm X_{c\bar c}$

Lees, J.P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Brown, David Nathan; Kolomensky, Yu.G.; Fritsch, M.; Koch, H.

doi:10.1103/PhysRevLett.124.152001

Measurements of the Absolute Branching Fractions of $B^\pm \to K^\pm X_{c\bar c}$

BaBar

Collaboration

Nov 26, 2019

8 pages

Published in:

Phys.Rev.Lett. 124 (2020) 15, 152001

Published: Apr 17, 2020

e-Print:

1911.11740 [hep-ex]

DOI:

10.1103/PhysRevLett.124.152001

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\mathit \chi}_{{{c1}}}{(1P)}}{{\mathit K}^{+}}

Report number:

BABAR-PUB-18/04,
SLAC_PUB-17489,
BABAR-PUB-18-004

Experiments:

SLAC-PEP2-BABAR

View in:

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Abstract: (APS)

A study of the two-body decays B±→Xcc¯K±, where Xcc¯ refers to one charmonium state, is reported by the BABAR Collaboration using a data sample of 424 fb-1. The absolute determination of branching fractions for these decays are significantly improved compared to previous BABAR measurements. Evidence is found for the decay B+→X(3872)K+ at the 3σ level. The absolute branching fraction B[B+→X(3872)K+]=[2.1±0.6(stat)±0.3(syst)]×10-4 is measured for the first time. It follows that B[X(3872)→J/ψπ+π-]=(4.1±1.3)%, supporting the hypothesis of a molecular component for this resonance.

Note:

8 pages 6 figures

Elementary Particles and Fields
electron positron: annihilation
electron positron: colliding beams
B+: hadronic decay
B-: hadronic decay
B+: branching ratio: measured
B-: branching ratio: measured
charmonium: electroproduction
X(3872): branching ratio
BaBar

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Figures(6)

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