The differential branching fraction of the decay Λb0→Λμ+μ- is measured as a function of the square of the dimuon invariant mass, q2. A yield of 78±12 Λb0→Λμ+μ- decays is observed using data, corresponding to an integrated luminosity of 1.0 fb-1, collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. A significant signal is found in the q2region above the square of the J/ψ mass, while at lower-q2values upper limits are set on the differential branching fraction. Integrating the differential branching fraction over q2, while excluding the J/ψ and ψ(2S) regions, gives a branching fraction of B(Λb0→Λμ+μ-)=(0.96±0.16(stat)±0.13(syst)±0.21(norm))×10-6, where the uncertainties are statistical, systematic and due to the normalisation mode, Λb0→J/ψΛ, respectively. © 2013 CERN.

Measurement of the differential branching fraction of the decay Λb0→Λμ+μ- / Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarezcartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., Anderlini, L., Anderson, J., Andreassen, R., Andrews, J.E., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 725:1-3(2013), pp. 25-35. [10.1016/j.physletb.2013.06.060]

Measurement of the differential branching fraction of the decay Λb0→Λμ+μ-

Bizzeti A.;
2013

Abstract

The differential branching fraction of the decay Λb0→Λμ+μ- is measured as a function of the square of the dimuon invariant mass, q2. A yield of 78±12 Λb0→Λμ+μ- decays is observed using data, corresponding to an integrated luminosity of 1.0 fb-1, collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. A significant signal is found in the q2region above the square of the J/ψ mass, while at lower-q2values upper limits are set on the differential branching fraction. Integrating the differential branching fraction over q2, while excluding the J/ψ and ψ(2S) regions, gives a branching fraction of B(Λb0→Λμ+μ-)=(0.96±0.16(stat)±0.13(syst)±0.21(norm))×10-6, where the uncertainties are statistical, systematic and due to the normalisation mode, Λb0→J/ψΛ, respectively. © 2013 CERN.
2013
725
1-3
25
35
Measurement of the differential branching fraction of the decay Λb0→Λμ+μ- / Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarezcartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., Anderlini, L., Anderson, J., Andreassen, R., Andrews, J.E., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 725:1-3(2013), pp. 25-35. [10.1016/j.physletb.2013.06.060]
Aaij, R.; Adeva, B.; Adinolfi, M.; Adrover, C.; Affolder, A.; Ajaltouni, Z.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvarezc...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1209460
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