Search for $CP$ violation and observation of $P$ violation in ${\Lambda }_b^0\to p{\pi }^{-}{\pi }^{+}{\pi }^{-}$ decays

Abstract

A search for $CP$ violation in the ${\Lambda }_b^0\to p{\pi }^{-}{\pi }^{+}{\pi }^{-}$ decay is performed using LHCb data corresponding to an integrated luminosity of 6.6$f{b}^{-1}$ collected in $pp$ collisions at centre-of-mass energies of 7, 8 and 13$TeV$. The analysis uses both triple product asymmetries and the unbinned energy test method. The highest significances of $CP$ asymmetry are 2.9 standard deviations from triple product asymmetries and 3.0 standard deviations for the energy test method. Once the global $p$-value is considered, all results are consistent with no $CP$ violation. Parity violation is observed at a significance of $5.5$ standard deviations for the triple product asymmetry method and $5.3$ standard deviations for the energy test method.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-028.html (LHCb public pages)

References in corpus (19)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• LHCb Detector Performance
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• Observation of Large CP Violation in the Neutral B Meson System
• Observation of $CP$ violation in charm decays
• Measurement of CP-violating asymmetries in B0 decays to CP eigenstates
• Measurement of matter-antimatter differences in beauty baryon decays
• Measurements of the Lambda_b0 -> J/psi Lambda decay amplitudes and the Lambda_b0 polarisation in pp collisions at sqrt(s) = 7 TeV
• Probing CP violation systematically in differential distributions
• How good are your fits? Unbinned multivariate goodness-of-fit tests in high energy physics
• Observing CP Violation in Many-Body Decays
• Search for CP violation using $T$-odd correlations in $D^0\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$ decays
• Search for $CP$ violation using $T$-odd correlations in $D^0\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$ decays
• On model-independent searches for direct CP violation in multi-body decays
• CP violation in multibody decays of beauty baryons
• Calculating $p$-values and their significances with the Energy Test for large datasets
• Biased bootstrap sampling for efficient two-sample testing

Cited by in corpus (15)

• Study of $\itΛ_{\it{b}}^\rm{0}$ and $\itΞ_{\it{b}}^\rm{0}$ decays to $\Lambda h^{+}{h}^{{}^{\prime }-}$ and evidence for $CP$ violation in $\itΛ_{\it{b}}^\rm{0}\to\itΛ K^+K^-$ decays
• Search for $CP$ violation in ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$ decays
• A novel observable for $CP$ violation in multi-body decays and its application potential to charm and beauty meson decays
• Measurement of $CP$ asymmetries in ${\Lambda }_b^0\to p{h}^{-}$ decays
• Analysis of angular distribution asymmetries and the associated $CP$ asymmetries in three-body decays of bottom baryons
• Searching for $CP$ violation through two-dimensional angular distributions in four-body decays of bottom and charmed baryons
• Measuring $\mathbf{CP}$ violating phase in beauty baryon decays
• CP Violation In Baryon Decays At LHCb
• Topological amplitudes of bottom baryon decays in the $SU(3{)}_F$ limit
• First evidence of $CP$ violation in beauty baryon to charmonium decays
• Amplitude analysis of the ${\Xi }_c^{+}\to p{K}^{-}{\pi }^{+}$ decay and ${\Xi }_c^{+}$ baryon polarization measurement in semileptonic beauty-hadron decays
• Prospects for $P$ and $CP$ violation in ${\Lambda }_c^{+}$ decays with polarized beam at Super Tau-Charm Facility
• Search for $\text{CP}$ violation in the phase space of $D^0\to K_S^0{K}^{\pm }{\pi }^{\mp }$ decays with the energy test
• $CP$-violation and $U$-spin symmetry in four-body bottom baryon decays
• Search for $CP$ violation using $\hat{T}$-odd correlations in $B^0\to p\bar{p}{K}^{+}{\pi }^{-}$ decays