@Article{LHCbCollaborationAaij_etal2017,
author="LHCb Collaboration (Aaij, R. et al
and Garcia Martin, L. M.
and Henry, L.
and Martinez-Vidal, F.
and Oyanguren, A.
and Remon Alepuz, C.
and Ruiz Valls, P.
and Sanchez Mayordomo, C.",
title="Measurement of the B-s(0)-> mu(+) mu(-) Branching Fraction and Effective Lifetime and Search for B-0 ->mu(+) mu(-) Decays",
journal="Physical Review Letters",
year="2017",
publisher="Amer Physical Soc",
volume="118",
number="19",
pages="191801 - 11pp",
abstract="A search for the rare decays B-s(0)->mu(+)mu(-) and B-0 -> mu(+)mu(-) is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb(-1). An excess of B-s(0) -> mu(+)mu- decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(B-s(0) -> mu(+)mu(-)) = (3.0 +/- 0.6(-0.2)(+)(0.3)) x 10(-9), where the first uncertainty is statistical and the second systematic. The first measurement of the B-s(0) -> mu(+)mu(-) effective lifetime, tau(B-s(0)-> mu(+) mu(-)) = 2.04 +/- 0.44 +/- 0.05 ps, is reported. No significant excess of B-0 -> mu(+)mu(-) decays is found, and a 95{\%} confidence level upper limit, B(B-0 -> mu(+)mu(-) ) < 3.4 x 10(-10), is determined. All results are in agreement with the standard model expectations.",
optnote="WOS:000401240300003",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3128), last updated on Fri, 02 Jun 2017 14:39:00 +0000",
issn="0031-9007",
doi="10.1103/PhysRevLett.118.191801",
opturl="http://arxiv.org/abs/1703.05747",
opturl="https://doi.org/10.1103/PhysRevLett.118.191801",
archivePrefix="arXiv",
eprint="1703.05747",
language="English"
}