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Measurement of the exclusive Υ production cross-section in pp collisions at √s=7 TeV and 8 TeV

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A study is presented of central exclusive production of Υ(nS) states, where the Υ(nS) resonances decay to the μ+μ− final state, using pp collision data recorded by the LHCb experiment. The cross-section is measured in the rapidity range 2 < y(Υ) < 4.5 where the muons are reconstructed in the p...

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Main Authors: Aaij, Roel (Author) , Aquines Gutiérrez, Osvaldo (Author) , D'Argent, Philippe (Author) , Bachmann, Sebastian (Author) , Bien, Alexander (Author) , Blouw, Johan (Author) , Braun, Svende (Author) , Britsch, Markward (Author) , Comerma-Montells, Albert (Author) , De Cian, Michel (Author) , Dordei, Francesca (Author) , Esen, Sevda (Author) , Färber, Christian (Author) , Fontana, Marianna (Author) , Gerick, David (Author) , Gersabeck, Evelina (Author) , Grillo, Lucia (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Jäger, Andreas (Author) , Kolpin, Michael (Author) , Kreplin, Katharina (Author) , Krocker, Georg Alexander (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Kecke, Matthieu (Author) , Meißner, Marco (Author) , Mitzel, Dominik (Author) , Neubert, Sebastian (Author) , Neuner, Max (Author) , Nikodem, Thomas (Author) , Schmelling, Michael (Author) , Seyfert, Paul (Author) , Stahl, Marian (Author) , Uwer, Ulrich (Author) , Vesterinen, Mika (Author) , Wandernoth, Sebastian (Author) , Wiedner, Dirk (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 14 September 2015
In: Journal of high energy physics
Year: 2015, Pages: 1-19
ISSN:1029-8479
DOI:10.1007/JHEP09(2015)084
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP09(2015)084
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Author Notes:the LHCb collaboration
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Summary:A study is presented of central exclusive production of Υ(nS) states, where the Υ(nS) resonances decay to the μ+μ− final state, using pp collision data recorded by the LHCb experiment. The cross-section is measured in the rapidity range 2 < y(Υ) < 4.5 where the muons are reconstructed in the pseudorapidity range 2 < η(μ±) < 4.5. The data sample corresponds to an integrated luminosity of 2.9 fb−1 and was collected at centre-of-mass energies of 7 TeV and 8 TeV. The measured Υ(1S) and Υ(2S) production cross-sections areσpp→pΥ1Sp=9.0±2.1±1.7pbandσpp→pΥ2Sp=1.3±0.8±0.3pb,$$ \sigma \left( pp\to pY(1S)p\right)=9.0\pm 2.1\pm 1.7\kern0.5em \mathrm{p}\mathrm{b}\kern0.5em \mathrm{and}\kern0.5em \sigma \left( pp\to pY(2S)p\right)=1.3\pm 0.8\pm 0.3\kern0.5em \mathrm{p}\mathrm{b}, $$where the first uncertainties are statistical and the second are systematic. The Υ(1S) crosssection is also measured as a function of rapidity and is found to be in good agreement with Standard Model predictions. An upper limit is set at 3.4 pb at the 95% confidence level for the exclusive Υ(3S) production cross-section, including possible contamination from χb(3P ) → Υ(3S)γ decays.
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The LHCb Collaboration: R. Aaij, O. Aquines Gutierrez, P. d'Argent, S. Bachmann, A. Bien, J. Blouw, M. Britsch, S. Braun, A. Comerma-Montells, M. De Cian, F. Dordei, S. Esen, C. Faerber, M. Fontana, E. Gersabeck, L. Grillo, X. Han, S. Hansmann-Menzemer, A. Jaeger, K. Matthieu, M. Kolpin, K. Kreplin, G. Krocker, B. Leverington, J. Marks, M. Meissner, J. Neubert, M. Neuner, T. Nikodem, M. Schmelling, P. Seyfert, M. Stahl, U. Uwer, M. Vesterinen, S. Wandernoth, D. Wiedner, A. Zhelezov [und 670 weitere]
Gesehen am 31.03.2021
Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP09(2015)084

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