Differential branching fraction and angular analysis of Λ0b → Λμ+μ- decays

The differential branching fraction of the rare decay Λb0→ Λμ+μ− is measured as a function of q2, the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment. Evidence o...

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Hauptverfasser:	Aaij, Roel (VerfasserIn) , Adeva, B. (VerfasserIn) , Adinolfi, M. (VerfasserIn) , Aquines Gutiérrez, Osvaldo (VerfasserIn) , Bachmann, Sebastian (VerfasserIn) , Bien, Alexander (VerfasserIn) , Blouw, Johan (VerfasserIn) , Braun, Svende (VerfasserIn) , Britsch, Markward (VerfasserIn) , Comerma-Montells, Albert (VerfasserIn) , De Cian, Michel (VerfasserIn) , Dordei, Francesca (VerfasserIn) , Esen, Sevda (VerfasserIn) , Färber, Christian (VerfasserIn) , Fontana, Marianna (VerfasserIn) , Gerick, David (VerfasserIn) , Gersabeck, Evelina (VerfasserIn) , Grillo, Lucia (VerfasserIn) , Han, Xiaoxue (VerfasserIn) , Hansmann-Menzemer, Stephanie (VerfasserIn) , Jäger, Andreas (VerfasserIn) , Kolpin, Michael (VerfasserIn) , Kreplin, Katharina (VerfasserIn) , Krocker, Georg Alexander (VerfasserIn) , Leverington, Blake (VerfasserIn) , Marks, Jörg (VerfasserIn) , Meißner, Marco (VerfasserIn) , Mitzel, Dominik (VerfasserIn) , Neubert, Sebastian (VerfasserIn) , Neuner, Max (VerfasserIn) , Nikodem, Thomas (VerfasserIn) , Schmelling, Michael (VerfasserIn) , Seyfert, Paul (VerfasserIn) , Stahl, Marian (VerfasserIn) , Stahl, Sascha (VerfasserIn) , Uwer, Ulrich (VerfasserIn) , Vesterinen, Mika (VerfasserIn) , Waldi, Roland (VerfasserIn) , Wandernoth, Sebastian (VerfasserIn) , Wiedner, Dirk (VerfasserIn) , Zhelezov, Alexey (VerfasserIn)
Körperschaft:	LHCb Collaboration (VerfasserIn)
Dokumenttyp:	Article (Journal)
Sprache:	Englisch
Veröffentlicht:	June 17, 2015
In:	Journal of high energy physics Year: 2015, Heft: 6
ISSN:	1029-8479
DOI:	10.1007/JHEP06(2015)115
Online-Zugang:	Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP06(2015)115
Verfasserangaben:	the LHCb collaboration

MARC


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245	1	0	\|a Differential branching fraction and angular analysis of Λ0b → Λμ+μ- decays \|c the LHCb collaboration
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246	3	3	\|a Differential branching fraction and angular analysis of lambda 0 b → lambda mu + mu - decays
264		1	\|c June 17, 2015
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500			\|a Im Titel sind "0", "+" und "-" hochgestellt
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500			\|a The LHCb Collaboration: R. Aaij, O. Aquines Gutierrez, B. Adeva, M. Adinolfi, S. Bachmann, A. Bien, J. Blouw, S. Braun, M. Britsch, A. Comerma-Montells, M. De Cian, F. Dordei, S. Esen, C. Faerber, M. Fontana, D. Gerick, E. Gersabeck, L. Grillo, X. Han, S. Hansmann-Menzemer, A. Jaeger, M. Kolpin, K. Kreplin, G. Krocker, B. Leverington, J. Marks, M. Meissner, D.S. Mitzel, J. Neubert, M. Neuner, T. Nikodem, M. Schmelling, P. Seyfert, M. Stahl, S. Stahl, U. Uwer, M. Vesterinen, R. Waldi, S. Wandernoth, D. Wiedner, A. Zhelezov [und 662 weitere]
500			\|a Gesehen am 08.10.2020
520			\|a The differential branching fraction of the rare decay Λb0→ Λμ+μ− is measured as a function of q2, the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment. Evidence of signal is observed in the q2 region below the square of the J/ψ mass. Integrating over 15 < q2 < 20 GeV2/c4 the differential branching fraction is measured asdℬΛb0→Λμ+μ−/dq2=1.18−0.08+0.09±0.03±0.27×10−7GeV2/c4−1, where the uncertainties are statistical, systematic and due to the normalisation mode, Λb0→ J/ψΛ, respectively. In the q2 intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (AFBℓ) and hadron (AFBh) systems are measured for the first time. In the range 15 < q2 < 20 GeV2/c4 they are found to beAFBℓ=−0.05±0.09stat±0.03systandAFBh=−0.29±0.07stat±0.03syst.
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SRT			\|a LHCBCOLLABDIFFERENTI1720

Differential branching fraction and angular analysis of Λ0b → Λμ+μ- decays

MARC

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