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Title: Evidence for an excess of B to D(*) Tau Nu decays

Abstract

Based on the full BABAR data sample, we report improved measurements of the ratios R(D{sup (*)}) = {Beta}({bar B} {yields} D{sup (*)} {tau}{sup -}{bar {nu}}{sub {tau}})/{Beta}({bar B} {yields} D{sup (*)} {ell}{sup -}{bar {nu}}{sub {ell}}), where {ell} is either e or {mu}. These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. We measure R(D) = 0.440 {+-} 0.058 {+-} 0.042 and R(D*) = 0.332 {+-} 0.024 {+-} 0.018, which exceed the Standard Model expectations by 2.0{sigma} and 2.7{sigma}, respectively. Taken together, our results disagree with these expectations at the 3.4{sigma} level. This excess cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model. We also report the observation of the decay {bar B} {yields} D{tau}{sup -} {bar {nu}}{sub {tau}}, with a significance of 6.8{sigma}.

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); High Energy Physics (HEP)
OSTI Identifier:
1043203
Report Number(s):
SLAC-PUB-15028
Journal ID: ISSN 0031--9007; arXiv:1205.5442; TRN: US1203024
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Journal Name:
Phys.Rev.Lett.109:101802,2012
Additional Journal Information:
Journal Volume: 109; Journal Issue: 10; Journal ID: ISSN 0031--9007
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DECAY; HIGGS BOSONS; PHYSICS; STANDARD MODEL; Experiment-HEP,HEPEX

Citation Formats

Lees, J P, Poireau, V, Tisserand, V, /Annecy, LAPP, Garra Tico, J, Grauges, E, /Barcelona U., ECM, Palano, A, /Bari U. /INFN, Bari, Eigen, G, Stugu, B, /Bergen U., Brown, David Nathan, Kerth, L T, Kolomensky, Yu G, Lynch, G, /LBL, Berkeley /UC, Berkeley, Koch, H, Schroeder, T, /Ruhr U., Bochum, Asgeirsson, D J, Hearty, C, Mattison, T S, McKenna, J A, So, R Y, /British Columbia U., Khan, A, /Brunel U., Blinov, V E, /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Genoa U. /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Harvey Mudd Coll. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U., Comp. Sci. Dept. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Milan U. /INFN, Milan /Mississippi U. /Montreal U. /Naples U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U., and /more authors. Evidence for an excess of B to D(*) Tau Nu decays. United States: N. p., 2012. Web. doi:10.1103/PhysRevLett.109.101802.
Lees, J P, Poireau, V, Tisserand, V, /Annecy, LAPP, Garra Tico, J, Grauges, E, /Barcelona U., ECM, Palano, A, /Bari U. /INFN, Bari, Eigen, G, Stugu, B, /Bergen U., Brown, David Nathan, Kerth, L T, Kolomensky, Yu G, Lynch, G, /LBL, Berkeley /UC, Berkeley, Koch, H, Schroeder, T, /Ruhr U., Bochum, Asgeirsson, D J, Hearty, C, Mattison, T S, McKenna, J A, So, R Y, /British Columbia U., Khan, A, /Brunel U., Blinov, V E, /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Genoa U. /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Harvey Mudd Coll. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U., Comp. Sci. Dept. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Milan U. /INFN, Milan /Mississippi U. /Montreal U. /Naples U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U., & /more authors. Evidence for an excess of B to D(*) Tau Nu decays. United States. https://doi.org/10.1103/PhysRevLett.109.101802
Lees, J P, Poireau, V, Tisserand, V, /Annecy, LAPP, Garra Tico, J, Grauges, E, /Barcelona U., ECM, Palano, A, /Bari U. /INFN, Bari, Eigen, G, Stugu, B, /Bergen U., Brown, David Nathan, Kerth, L T, Kolomensky, Yu G, Lynch, G, /LBL, Berkeley /UC, Berkeley, Koch, H, Schroeder, T, /Ruhr U., Bochum, Asgeirsson, D J, Hearty, C, Mattison, T S, McKenna, J A, So, R Y, /British Columbia U., Khan, A, /Brunel U., Blinov, V E, /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Genoa U. /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Harvey Mudd Coll. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U., Comp. Sci. Dept. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Milan U. /INFN, Milan /Mississippi U. /Montreal U. /Naples U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U., and /more authors. 2012. "Evidence for an excess of B to D(*) Tau Nu decays". United States. https://doi.org/10.1103/PhysRevLett.109.101802. https://www.osti.gov/servlets/purl/1043203.
@article{osti_1043203,
title = {Evidence for an excess of B to D(*) Tau Nu decays},
author = {Lees, J P and Poireau, V and Tisserand, V and /Annecy, LAPP and Garra Tico, J and Grauges, E and /Barcelona U., ECM and Palano, A and /Bari U. /INFN, Bari and Eigen, G and Stugu, B and /Bergen U. and Brown, David Nathan and Kerth, L T and Kolomensky, Yu G and Lynch, G and /LBL, Berkeley /UC, Berkeley and Koch, H and Schroeder, T and /Ruhr U., Bochum and Asgeirsson, D J and Hearty, C and Mattison, T S and McKenna, J A and So, R Y and /British Columbia U. and Khan, A and /Brunel U. and Blinov, V E and /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Genoa U. /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Harvey Mudd Coll. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U., Comp. Sci. Dept. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Milan U. /INFN, Milan /Mississippi U. /Montreal U. /Naples U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. and /more authors.},
abstractNote = {Based on the full BABAR data sample, we report improved measurements of the ratios R(D{sup (*)}) = {Beta}({bar B} {yields} D{sup (*)} {tau}{sup -}{bar {nu}}{sub {tau}})/{Beta}({bar B} {yields} D{sup (*)} {ell}{sup -}{bar {nu}}{sub {ell}}), where {ell} is either e or {mu}. These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. We measure R(D) = 0.440 {+-} 0.058 {+-} 0.042 and R(D*) = 0.332 {+-} 0.024 {+-} 0.018, which exceed the Standard Model expectations by 2.0{sigma} and 2.7{sigma}, respectively. Taken together, our results disagree with these expectations at the 3.4{sigma} level. This excess cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model. We also report the observation of the decay {bar B} {yields} D{tau}{sup -} {bar {nu}}{sub {tau}}, with a significance of 6.8{sigma}.},
doi = {10.1103/PhysRevLett.109.101802},
url = {https://www.osti.gov/biblio/1043203}, journal = {Phys.Rev.Lett.109:101802,2012},
issn = {0031--9007},
number = 10,
volume = 109,
place = {United States},
year = {Tue Oct 09 00:00:00 EDT 2012},
month = {Tue Oct 09 00:00:00 EDT 2012}
}