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B.van Tilburg, J.van Veghel, M.Vazquez Gomez, R.Vazquez Regueiro, P.Vecchi, S.Velthuis, J. J.Veltri, M.Venkateswaran, A.Veronesi, M.Vesterinen, M.Vieira, D.Diaz, M. VieitesViemann, H.Vilasis-Cardona, X.Figueras, E. VilellaVilla, A.Vincent, P.Volle, F. C.Vom Bruch, D.Vorobyev, A.Vorobyev, V.Voropaev, N.Vos, K.Waldi, R.Walsh, J.Wang, C.Wang, J.Wang, M.Wang, R.Wang, Y.Wang, Z.Ward, J. A.Wark, H. M.Watson, N. K.Weber, S. G.Websdale, D.Weisser, C.Westhenry, B. D. C.White, D. J.Whitehead, M.Wiederhold, A. R.Wiedner, D.Wilkinson, G.Wilkinson, M.Williams, IWilliams, M.Williams, M. R. J.Wilson, F. F.Wislicki, W.Witek, M.Witola, L.Wormser, G.Wotton, S. A.Wu, H.Wyllie, K.Xiang, Z.Xiao, D.Xie, Y.Xu, A.Xu, J.Xu, L.Xu, M.Xu, Q.Xu, Z.Yang, D.Yang, S.Yang, Y.Yang, Z.Yao, Y.Yeomans, L. E.Yin, H.Yu, J.Yuan, X.Yushchenko, O.Zaffaroni, E.Zavertyaev, M.Zdybal, M.Zenaiev, O.Zeng, M.Zhang, D.Zhang, L.Zhang, S.Zhang, Y.Zharkova, A.Zhelezov, A.Zheng, Y.Zhou, X.Zhou, Y.Zhovkovska, VZhu, X.Zhu, Z.Zhukov, VZonneveld, J. B.Zou, Q.Zucchelli, S.Zuliani, D.Zunica, G.2021-11-062021-11-062021-11-062021-10-0710.1007/JHEP10(2021)060https://infoscience.epfl.ch/handle/20.500.14299/182929WOS:000705235400002This article presents differential measurements of the asymmetry between Lambda(0)(b) and (Lambda) over bar (0)(b) baryon production rates in proton-proton collisions at centre-of-mass energies of root s = 7 and 8 TeV collected with the LHCb experiment, corresponding to an integrated luminosity of 3 fb(-1). The Lambda(0)(b) baryons are reconstructed through the inclusive semileptonic decay Lambda(0)(b) -> Lambda(+)(c) mu(-)(nu) over bar X-mu. 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 root 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 Pythia and heavy-quark recombination are provided. This result constitutes the first observation of a particle-antiparticle asymmetry in b-hadron production at LHC energies.Physics, Particles & FieldsPhysicshadron-hadron scattering (experiments)heavy quark productionproton-proton scatteringhard scatteringb physicstext::journal::journal article::research article