Publications by Neville Harnew

Measurement of the B0s→μ+μ− branching fraction and effective lifetime and search for B0→μ+μ−decays.

Physical Review Letters American Physical Society 118 (2017) 191801-

R Aaij, B Adeva, M Adinolfi, T Evans, P Gandini, BR Gruberg Cazon, T Hadavizadeh, N Harnew, DR Hill, PG Jalocha, MJJ John, NP Jurik, S Malde, AK Nandi, A Rollings, S Topp-Joergensen, G Veneziano, GR Wilkinson

<p>A search for the rare decays B0s→μ+μ− and B0→μ+μ− 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 B0s→μ+μ− 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(B0s→μ+μ−)=(3.0±0.6+0.3−0.2)×10^−9, where the first uncertainty is statistical and the second systematic. The first measurement of the B0s→μ+μ− effective lifetime, τ(B0s→μ+μ−)=2.04±0.44±0.05  ps, is reported. No significant excess of B0→μ+μ− decays is found, and a 95% confidence level upper limit, B(B0→μ+μ−)&lt;3.4×10^−10, is determined. All results are in agreement with the standard model expectations.</p>

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