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Observation of the decay Λ0b → pK- μ+ μ- and a search for CP violation

MPS-Authors
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Blouw,  J.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Popov,  D.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Schmelling,  M.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Zavertiaev,  M.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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1703.00256.pdf
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Citation

LHCb collaboration, Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., et al. (2018). Observation of the decay Λ0b → pK- μ+ μ- and a search for CP violation. Journal of high energy physics: JHEP, 2017: 108. doi:10.1007/JHEP06(2017)108.


Cite as: https://hdl.handle.net/21.11116/0000-0005-886A-B
Abstract
A search for $C\!P$ violation in the decay $\Lambda^0_b \to p K^- \mu^+
\mu^-$ is presented. This decay is mediated by flavour-changing neutral-current
transitions in the Standard Model and is potentially sensitive to new sources
of $C\!P$ violation. The study is based on a data sample of proton-proton
collisions recorded with the LHCb experiment, corresponding to an integrated
luminosity of $3$ $\mathrm{fb}^{-1}$. The $\Lambda^0_b \to p K^- \mu^+ \mu^-$
decay is observed for the first time, and two observables that are sensitive to
different manifestations of $C\!P$ violation are measured,
$\Delta\mathcal{A}_{C\!P} \equiv \mathcal{A}_{C\!P}(\Lambda^0_b \to p K^- \mu^+
\mu^-)-\mathcal{A}_{C\!P}(\Lambda^0_b\to pK^- J/\psi)$ and
$a_{C\!P}^{\widehat{T}-odd}$, where the latter is based on asymmetries in the
angle between the $\mu^+\mu^-$ and $p K^-$ decay planes. These are measured to
be $\Delta\mathcal{A}_{C\!P} = (-3.5 \pm 5.0(stat) \pm 0.2(syst))\times
10^{-2}$, $a_{C\!P}^{\widehat{T}-odd} = (1.2 \pm 5.0(stat) \pm 0.7(syst))\times
10^{-2}$, and no evidence for $C\!P$ violation is found.