Studies of the decays $B^+ \to p \bar p h^+$ and observation of $B^+ \to \kern 0.1em\bar{\kern -0.1em\Lambda}(1520)p$

Aaij, R; Adeva, B; Adinolfi, M; Adrover, C; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F; Alexander, M; Ali, S

doi:10.1103/PhysRevD.88.052015

Studies of the decays $B^+ \to p \bar p h^+$ and observation of $B^+ \to \kern 0.1em\bar{\kern -0.1em\Lambda}(1520)p$

LHCb

Collaboration

Jul 23, 2013

13 pages

Published in:

Phys.Rev.D 88 (2013) 5, 052015

Published: Sep 19, 2013

e-Print:

1307.6165 [hep-ex]

DOI:

10.1103/PhysRevD.88.052015

PDG:

{{\mathit B}^{+}}

\rightarrow

{{\mathit p}}{{\overline{\mathit \Lambda}}{(1520)}}

Report number:

CERN-PH-EP-2013-125,
LHCB-PAPER-2013-031

Experiments:

CERN-LHC-LHCb

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Abstract: (APS)

Dynamics and direct CP violation in three-body charmless decays of charged B mesons to a proton, an antiproton and a light meson (pion or kaon) are studied using data, corresponding to an integrated luminosity of 1.0 fb-1, collected by the LHCb experiment in pp collisions at a center-of-mass energy of 7 TeV. Production spectra are determined as a function of Dalitz-plot and helicity variables. The forward-backward asymmetry of the light meson in the pp¯ rest frame is measured. No significant CP asymmetry in B+→pp¯K+ decay is found in any region of the Dalitz plane. We present the first observation of the decay B+→Λ¯(1520)(→K+p¯)p near the K+p¯ threshold and measure B(B+→Λ¯(1520)p)=(3.9-0.9+1.0(stat)±0.1(syst)±0.3(BF))×10-7, where BF denotes the uncertainty on secondary branching fractions.

Note:

20 pages, 17 figures

13.25.Hw
angular distribution: asymmetry
p p: scattering
B+: hadronic decay
B+: branching ratio: measured
Dalitz plot
helicity
LHC-B
final state: (0charm)
p: pair production

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Figures(17)

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Studies of the decays B+→ppˉh+B^+ \to p \bar p h^+B+→ppˉ​h+ and observation of B+→Λˉ(1520)pB^+ \to \kern 0.1em\bar{\kern -0.1em\Lambda}(1520)pB+→Λˉ(1520)p

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Studies of the decays $B^+ \to p \bar p h^+$ and observation of $B^+ \to \kern 0.1em\bar{\kern -0.1em\Lambda}(1520)p$