Differential branching fraction and angular analysis of the decay B^0 -> K^*0 μ+μ−.

The LHCb Collaboration, Matthew Needham, Franz Muheim, Peter Clarke, Yuehong Xie, Stephan Eisenhardt

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The angular distributions and the partial branching fraction of the decay B0→K∗0μ+μ− are studied using an integrated luminosity of 0.37fb−1 of data collected with the LHCb detector. The forward-backward asymmetry of the muons, AFB, the fraction of longitudinal polarisation, FL, and the partial branching fraction, dB/dq2, are determined as a function of the dimuon invariant mass. The measurements are in good agreement with the Standard Model predictions and are the most precise to date. In the dimuon invariant mass squared range 1.00−6.00GeV2/c4, the results are AFB=−0.06+0.13−0.14±0.04, FL=0.55±0.10±0.03 and dB/dq2=(0.42±0.06±0.03)×10−7c4/GeV2. In each case, the first error is statistical and the second systematic.
Original languageEnglish
Pages (from-to)181806
Number of pages1
JournalPhysical Review Letters
Early online date15 Dec 2011
Publication statusPublished - 3 May 2012


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