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  • Search for $C\!P$ violation and observation of $P$ violation in $\Lambda_b^0 \to p \pi^- \pi^+ \pi^-$ decays
    Ajaltouni, Z; Aslanides, E; Barsuk, S; Beiter, A; Bellee, V; Bernstein, H. C; Betancourt, C; Bizzeti, A; Blake, T; Bocci, V; Bondar, N; Borisyak, M; Capriotti, L; Cenci, R; Cerasoli, J; Chitic, S. -G; Cobbledick, J. L; Collins, P; Crocombe, A; Dalseno, J; D'Ambrosio, C; De Miranda, J. M; Deschamps, O; Dovbnya, A; Dzhelyadin, R; Easo, S; Egede, U; Escher, S; Sole, S. Ferreres; Fontana, M; Forty, R; Fu, J; Tico, J. Garra; Gerick, D; Gershon, T; Giubega, L; Gorelov, I. V; Cardoso, L. A. Granado; Haefeli, G; Hancock, T. H; Hunter, R. J; Kandybei, S; Kazeev, N; Khanji, B; Kharisova, A; Klimaszewski, K; Krawczyk, R. D; Kress, F; Lazzeroni, C; Castro, J. Lomba; Lopes, J. H; Lyu, X; Malecki, B; Marchand, J. F; Martinazzoli, L; Mathe, Z; McNab, A; Mitzel, D. S; Monroy, I. A; Moron, J; Morris, A. B; Nanut, T; Nasteva, I; Nikitin, N; Ossowska, A; Papanestis, A; Penso, G; Pereima, D; Piucci, A; Polycarpo, E; Popov, D; Navarro, A. Puig; Pullen, H; Quagliani, R; Redi, F; Reichert, S; Gras, C. Sanchez; Sedes, B. Sanmartin; Savrina, D; Schael, S; Schindler, H; Schmidt, B; Sciubba, A; Shekhtman, L; Smeaton, J. G; Spaan, B; Norella, E. Spadaro; Stahl, M; Taneja, S; Tellarini, G; Traill, M; Regueiro, P. Vazquez; Sierra, C. Vázquez; Whitehead, M; Wilson, F. F; Wyllie, K; Yao, Y; Yushchenko, O; Zhang, S; Zhou, Y

    12/2019
    Journal Article

    Phys. Rev. D 102, 051101 (2020) A search for $C\!P$ 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$\,fb^{-1}$ collected in $pp$ collisions at centre-of-mass energies of 7, 8 and 13$\,Te\kern -0.1em V$. The analysis uses both triple product asymmetries and the unbinned energy test method. The highest significances of $C\!P$ 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 $C\!P$ 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.

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