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https://hdl.handle.net/11147/10658
Title: | Measurement of the B-S(0) ->mu(+)mu( Branching Fraction and Search for B-0 -> Mu(+)mu(-) With the Cms Experiment | Authors: | Karapınar, Güler | Publisher: | American Physical Society | Abstract: | Results are presented from a search for the rare decays B-s(0) -> mu(+) mu(-) and B-0 -> mu(+) mu(-) in pp collisions at root s = 7 and 8 TeV, with data samples corresponding to integrated luminosities of 5 and 20 fb(-1), respectively, collected by the CMS experiment at the LHC. An unbinned maximum-likelihood fit to the dimuon invariant mass distribution gives a branching fraction 'B(B-s(0) -> mu(+)mu(-)) = (3.0(-0.9)(+1.0)) x 10(-9), where the uncertainty includes both statistical and systematic contributions. An excess of B-s(0) -> mu(+)mu(-) events with respect to background is observed with a significance of 4.3 standard deviations. For the decay B-0 -> mu(+)mu(-) an upper limit of 'B(B-0 -> mu(+) mu(-)) < 1.1 x 10(-9) at the 95% confidence level is determined. Both results are in agreement with the expectations from the standard model. | URI: | https://doi.org/10.1103/PhysRevLett.111.101804 https://hdl.handle.net/11147/10658 |
ISSN: | 0031-9007 1079-7114 |
Appears in Collections: | Rectorate / Rektörlük WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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