Observation of a Λ0b − ̄ Λ0b production asymmetry in proton-proton collisions at √s=7 and 8 TeV
Abstract: This article presents differential measurements of the asymmetry between Λ0b and Λ0b 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 Λ0b baryons ar...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
October 7, 2021
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| In: |
Journal of high energy physics
Year: 2021, Heft: 10, Pages: 1-36 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP10(2021)060 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP10(2021)060
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| Verfasserangaben: | The LHCb collaboration |
MARC
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| 245 | 1 | 0 | |a Observation of a Λ0b − ̄ Λ0b production asymmetry in proton-proton collisions at √s=7 and 8 TeV |c The LHCb collaboration |
| 246 | 3 | 0 | |a λ̄ |
| 246 | 3 | 3 | |a Observation of a lambda zero b − lambda bar zero b production asymmetry in proton-proton collisions at square root s = 7 and 8 TeV |
| 264 | 1 | |c October 7, 2021 | |
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| 500 | |a Im Titel ist "0" hoch- und "b" in Λ0b − ̄ Λ0b tiefgestellt, dabei steht jeweils "0" über "b" | ||
| 500 | |a Im Titel steht der Buchstabe s unter dem Wurzelsymbol | ||
| 500 | |a Im Titel steht das zweite lambda mit einem Oberstrich | ||
| 500 | |a The LHCb collaboration: R. Aaij, F. Archilli, S. Bachmann, D. Berninghoff, M. Borsato, G. Frau, D. Gerick, J.P. Grabowski, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Kopecna, B. Leverington, P. Li, H. Malygina, J. Marks, N. Meinert, A.B. Morris, S. Neubert, M. Sarpis, M. Schmelling, D.J. Unverzagt, U. Uwer, H. Viemann, R. Waldi, C. Wang, L. Witola, M. Zavertyaev, A. Zhelezov, und weitere 955 | ||
| 500 | |a Gesehen am 12.11.2021 | ||
| 520 | |a Abstract: This article presents differential measurements of the asymmetry between Λ0b and Λ0b 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 Λ0b baryons are reconstructed through the inclusive semileptonic decay Λ0b → Λ+c μ−νμX. The production asymmetry is measured both in intervals of rapidity in the range 2.15 < y < 4.10 and transverse momentum in 2 < pT < 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 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. | ||
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