Observation of the decay $\Lambda_b^0 \to \Lambda_c^+ p \overline{p} \pi^-$ - INSPIRE

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Observation of the decay $\Lambda_b^0 \to \Lambda_c^+ p \overline{p} \pi^-$

LHCb

Collaboration

Apr 25, 2018

11 pages

Published in:

Phys.Lett.B 784 (2018) 101-111

Published: Sep 10, 2018

e-Print:

1804.09617 [hep-ex]

DOI:

10.1016/j.physletb.2018.07.033

PDG:

{{\mathit \Lambda}_{{{b}}}^{0}}

\rightarrow

{{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit \pi}^{-}}

Report number:

LHCB-PAPER-2018-005,
LHCb-PAPER-2018-005,
CERN-EP-2018-051

Experiments:

CERN-LHC-LHCb

View in:

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Abstract: (Elsevier)

The decay Λb0→Λc+pp‾π− is observed using pp collision data collected with the LHCb detector at centre-of-mass energies of s=7 and 8 Tev, corresponding to an integrated luminosity of 3 fb−1 . The ratio of branching fractions between Λb0→Λc+pp‾π− and Λb0→Λc+π− decays is measured to be B(Λb0→Λc+pp‾π−)B(Λb0→Λc+π−)=0.0540±0.0023±0.0032. Two resonant structures are observed in the Λc+π− mass spectrum of the Λb0→Λc+pp‾π− decays, corresponding to the Σc(2455)0 and Σc⁎(2520)0 states. The ratios of branching fractions with respect to the decay Λb0→Λc+pp‾π− are B(Λb0→Σc0pp‾)×B(Σc0→Λc+π−)B(Λb0→Λc+pp‾π−)=0.089±0.015±0.006,B(Λb0→Σc⁎0pp‾)×B(Σc⁎0→Λc+π−)B(Λb0→Λc+pp‾π−)=0.119±0.020±0.014. In all of the above results, the first uncertainty is statistical and the second is systematic. The phase space is also examined for the presence of dibaryon resonances. No evidence for such resonances is found.

Note:

All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-005.html

p p: colliding beams
Lambda/b0: hadronic decay
branching ratio: ratio: measured
p p: scattering
mass spectrum: (Lambda/c+ pi-)
mass spectrum: (Lambda/c+ p anti-p pi-)
intermediate state: mass
Breit-Wigner
mass: width
pentaquark

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