期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.111803
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资金
- CERN
- CAPES (Brazil)
- CNPq (Brazil)
- FAPERJ (Brazil)
- FINEP (Brazil)
- NSFC (China)
- CNRS/IN2P3 (France)
- BMBF (Germany)
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- NSF (USA)
- IN2P3 (France)
- KIT (Germany)
- SURF (The Netherlands)
- PIC (Spain)
- GridPP (United Kingdom)
- EPLANET
- Marie Sklodowska-Curie Actions
- ERC (European Union)
- Conseil general de Haute-Savoie
- Labex ENIGMASS
- OCEVU, Region Auvergne (France)
- RFBR (Russia)
- XuntaGal
- GENCAT (Spain)
- Royal Society
- Royal Commission for the Exhibition (United Kingdom)
- Science and Technology Facilities Council [ST/J50094X/1, ST/K001604/1, ST/K00137X/1, ST/N000250/1, ST/M004791/1 GRIDPP, ST/M001474/1, ST/K00140X/1, ST/M004791/1, 1096173, ST/N000447/1, 1511824, ST/K001256/1, ST/J004855/1, 1208164, ST/L006146/1, ST/H006737/1, ST/K001418/1, ST/J005495/1, LHCb, PP/E003095/1, ST/I003576/1, ST/K003534/1 GRIDPP, ST/L003392/1, ST/K003534/1, 1376072, ST/I000097/1, 1364044, 1369397] Funding Source: researchfish
- STFC [ST/N000447/1, ST/K00137X/1, ST/M004791/1, ST/K001604/1, ST/I000097/1, LHCb, ST/L006146/1, ST/K003534/1, PP/E003095/1, ST/J005495/1, ST/J50094X/1, ST/K00140X/1, ST/H006737/1, ST/J004855/1, ST/L003392/1, ST/I003576/1] Funding Source: UKRI
The branching fraction ratio R(D-*) = B((B) over bar (0) -> D-*(+)tau(-)(nu) over bar (tau))/B((B) over bar (0) -> D-*(+)mu(-)(nu) over bar (mu)) is measured using a sample of proton-proton collision data corresponding to 3.0 fb(-1) of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode tau(-) -> mu(-)(nu) over bar (mu)nu(tau). The semitauonic decay is sensitive to contributions from non-standard-model particles that preferentially couple to the third generation of fermions, in particular, Higgs-like charged scalars. A multidimensional fit to kinematic distributions of the candidate (B) over bar (0) decays gives R(D-*) = 0.336 +/- 0.027(stat) +/- 0.030(syst). This result, which is the first measurement of this quantity at a hadron collider, is 2.1 standard deviations larger than the value expected from lepton universality in the standard model.
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