Evidence for an excess of B→Dτ(-)ν(τ) decays

Based on the full BABAR data sample, we report improved measurements of the ratios R(D(*))=B(B[over ¯]→D(*)τ(-)ν[over ¯](τ))/B(B[over ¯]→D(*)ℓ(ℓ)(-)ν[over ¯](ℓ)), where ℓ is either e or μ. These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. We measure R(D)=0...

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Veröffentlicht in:	Physical review letters 2012-09, Vol.109 (10), p.101802-101802
Hauptverfasser:	Lees, J P, Poireau, V, Tisserand, V, Garra Tico, J, Grauges, E, Palano, A, Eigen, G, Stugu, B, Brown, D N, Kerth, L T, Kolomensky, Yu G, Lynch, G, Koch, H, Schroeder, T, Asgeirsson, D J, Hearty, C, Mattison, T S, McKenna, J A, So, R Y, Khan, A, Blinov, V E, Buzykaev, A R, Druzhinin, V P, Golubev, V B, Kravchenko, E A, Onuchin, A P, Serednyakov, S I, Skovpen, Yu I, Solodov, E P, Todyshev, K Yu, Yushkov, A N, Bondioli, M, Kirkby, D, Lankford, A J, Mandelkern, M, Atmacan, H, Gary, J W, Liu, F, Long, O, Vitug, G M, Campagnari, C, Hong, T M, Kovalskyi, D, Richman, J D, West, C A, Eisner, A M, Kroseberg, J, Lockman, W S, Martinez, A J, Schumm, B A, Seiden, A, Chao, D S, Cheng, C H, Echenard, B, Flood, K T, Hitlin, D G, Ongmongkolkul, P, Porter, F C, Rakitin, A Y, Andreassen, R, Huard, Z, Meadows, B T, Sokoloff, M D, Sun, L, Bloom, P C, Ford, W T, Gaz, A, Nauenberg, U, Smith, J G, Wagner, S R, Ayad, R, Toki, W H, Spaan, B, Schubert, K R, Schwierz, R, Bernard, D, Verderi, M, Clark, P J, Playfer, S, Bettoni, D, Bozzi, C, Calabrese, R, Cibinetto, G, Fioravanti, E, Garzia, I, Luppi, E, Munerato, M, Piemontese, L, Santoro, V, Baldini-Ferroli, R, Calcaterra, A, de Sangro, R, Finocchiaro, G, Patteri, P, Peruzzi, I M, Piccolo, M, Rama, M, Zallo, A, Contri, R, Guido, E
Format:	Artikel
Sprache:	eng
Schlagworte:	DECAY Experiment-HEP,HEPEX HIGGS BOSONS High Energy Physics - Experiment PHYSICS PHYSICS OF ELEMENTARY PARTICLES AND FIELDS STANDARD MODEL
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Zusammenfassung:	Based on the full BABAR data sample, we report improved measurements of the ratios R(D())=B(B[over ¯]→D()τ(-)ν[over ¯](τ))/B(B[over ¯]→D()ℓ(ℓ)(-)ν[over ¯](ℓ)), where ℓ is either e or μ. 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 2.0σ and 2.7σ, respectively. Taken together, our results disagree with these expectations at the 3.4σ level. This excess cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.109.101802