Observation of the decay $\Lambda_b^0\rightarrow\chi_{c1}p\pi^-$

Aaij, Roel; Abellán Beteta, Carlos; Ackernley, Thomas; Adeva, Bernardo; Adinolfi, Marco; Afsharnia, Hossein; Aidala, Christine Angela; Aiola, Salvatore; Ajaltouni, Ziad; Akar, Simon

doi:10.1007/JHEP05(2021)095

Observation of the decay $\Lambda_b^0\rightarrow\chi_{c1}p\pi^-$

LHCb

Collaboration

Mar 8, 2021

21 pages

Published in:

JHEP 05 (2021) 095

Published: May 12, 2021

e-Print:

2103.04949 [hep-ex]

DOI:

10.1007/JHEP05(2021)095

PDG:

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

\rightarrow

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

Report number:

CERN-EP-2021-037,
LHCb-PAPER-2021-003

Experiments:

CERN-LHC-LHCb

View in:

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Abstract: (arXiv)

The Cabibbo-suppressed decay

\Lambda_b^0\rightarrow\chi_{c1}p\pi^-

is observed for the first time using data from proton-proton collisions corresponding to an integrated luminosity of 6fb

^{-1}

, collected with the LHCb detector at a centre-of-mass energy of 13TeV. Evidence for the

\Lambda_b^0\rightarrow\chi_{c2}p\pi^-

decay is also found. Using the

\Lambda_b^0\rightarrow\chi_{c1}pK^-

decay as normalisation channel, the ratios of branching fractions are measured to be

\begin{array}{rcl} \frac{ \mathcal{B} (\Lambda_b^0\rightarrow\chi_{c1}p\pi^-)}{\mathcal{B} (\Lambda_b^0\rightarrow\chi_{c1}pK^-)} & = & (6.59 \pm 1.01 \pm 0.22 ) \times 10^{-2} \,, \frac{\mathcal{B} (\Lambda_b^0\rightarrow\chi_{c2}p\pi^-)}{\mathcal{B} (\Lambda_b^0\rightarrow\chi_{c1}p\pi^-)} & = & 0.95 \pm 0.30 \pm 0.04 \pm 0.04 \,, \frac{\mathcal{B} (\Lambda_b^0\rightarrow\chi_{c2}pK^-)}{\mathcal{B} (\Lambda_b^0\rightarrow\chi_{c1}pK^-)} & = & 1.06 \pm 0.05 \pm 0.04 \pm 0.04 \,,\end{array}

where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainties in the branching fractions of

\chi_{c1,2}\rightarrow J/\psi\gamma

decays.

Note:

19 pages, 3 figures, All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-003.html (LHCb public pages)". arXiv admin note: text overlap with arXiv:1806.08084

B physics
Branching fraction
Hadron-Hadron scattering (experiments)
QCD
Quarkonium
p p: colliding beams
Lambda/b0: hadronic decay
Lambda/b0: rare decay
chi/c1(3510): radiative decay
chi/c2(3555): radiative decay

References(46)

Figures(8)

Observation of $J/\psi p$ Resonances Consistent with Pentaquark States in $\Lambda_b^0 \to J/\psi K^- p$ Decays

LHCb

Collaboration

•

Roel Aaij
(
- CERN
)

et al.

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•
e-Print:
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•
DOI:
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Model-independent evidence for $J/\psi p$ contributions to $\Lambda_b^0\to J/\psi p K^-$ decays

LHCb

Collaboration

•

Roel Aaij
(
- CERN
)

et al.

- Phys.Rev.Lett. 117 (2016) 8, 082002
•
e-Print:
- 1604.05708
•
DOI:
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Observation of a narrow pentaquark state, $P_c(4312)^+$ , and of two-peak structure of the $P_c(4450)^+$

LHCb

Collaboration

•

Roel Aaij
(
- NIKHEF, Amsterdam
)

et al.

- Phys.Rev.Lett. 122 (2019) 22, 222001
•
e-Print:
- 1904.03947
•
DOI:
- 10.1103/PhysRevLett.122.222001

Evidence for exotic hadron contributions to $\Lambda_b^0 \to J/\psi p \pi^-$ decays

LHCb

Collaboration

•

Roel Aaij
(
- CERN
)

et al.

- Phys.Rev.Lett. 117 (2016) 8, 082003,
- Phys.Rev.Lett. 117 (2016) 10, 109902 (addendum),
- Phys.Rev.Lett. 118 (2017) 119901 (addendum)
•
e-Print:
- 1606.06999
•
DOI:
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