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  • Ackernley, T.; Alexander, M.; Anderlini, L.; Barlow, R. J.; Bedeschi, F.; Belin, S.; Belyaev, I.; Bitadze, A.; Borisyak, M.; Calvo Gomez, M.; Campoverde Quezada, A. F.; Carli, I.; Carus, L.; Chadwick, A. J.; Chen, C.; Chulikov, V.; Cid Vidal, X.; Coombs, G.; Corredoira, I.; Couturier, B.; Crkovská, J.; De Aguiar Francisco, O.; Dijkstra, H.; Durham, J. M.; Dutta, D.; Dziurda, A.; Escher, S.; Evans, T.; Fang, B.; Farry, S.; Ferro-Luzzi, M.; Fkiaras, A.; Fu, J.; Garau, M.; Geertsema, R. E.; Gerick, D.; Gioventù, A.; Gomez Fernandez, S.; Gotti, C.; Granado Cardoso, L. A.; Greeven, L. M.; Hecker, M.; Heinicke, K.; Hu, J.; Jiang, F.; Lanfranchi, G.; Lin, T.; Lusiani, A.; Maccolini, S.; Madejczyk, O.; Martinez Santos, D.; Materok, M.; Mauri, A.; Mcgrath, T. H.; McNulty, R.; Meier, G.; Meinert, N.; Merk, M.; Merli, A.; Mitchell, S. E.; Moise, R. D.; Neri, N.; Normand, C.; Owen, P.; Passalacqua, B.; Pinci, D.; Pisani, F.; Placinta, V.; Raven, G.; Roloff, P.; Rudolph, M. S.; Santacesaria, R.; Scarabotto, A.; Schneider, O.; Shmanin, E.; Shupperd, J. D.; Slater, M. W.; Soler, F. J. P.; Solovyev, I.; Stenyakin, O.; Stevens, H.; Sun, J.; Thomas, E.; Trippl, C.; Ukleja, A.; van Beuzekom, M.; Vazquez Gomez, R.; Vázquez Sierra, C.; Veronesi, M.; Vom Bruch, D.; Voropaev, N.; Waldi, R.; Walsh, J.; Wang, C.; White, D. J.; Xie, Y.; Xu, Z.; Yang, Y.; Yu, J.; Yuan, X.

    The journal of high energy physics, 10/2021, Letnik: 2021, Številka: 10
    Journal Article

    A bstract This article presents differential measurements of the asymmetry between Λ b 0 and Λ ¯ b 0 baryon production rates in proton-proton collisions at centre-of-mass energies of s = 7 and 8 TeV collected with the LHCb experiment, corresponding to an integrated luminosity of 3 fb − 1 . The Λ b 0 baryons are reconstructed through the inclusive semileptonic decay Λ b 0 → Λ c + μ − ν ¯ μ X . The production asymmetry is measured both in intervals of rapidity in the range 2 . 15 < y < 4 . 10 and transverse momentum in 2 < p T < 27 GeV/ c . The results are found to be incompatible with symmetric production with a significance of 5.8 standard deviations for both s = 7 and 8 TeV data, assuming no CP violation in the decay. There is evidence for a trend as a function of rapidity with a significance of 4 standard deviations. Comparisons to predictions from hadronisation models in P ythia and heavy-quark recombination are provided. This result constitutes the first observation of a particle-antiparticle asymmetry in b -hadron production at LHC energies.