| Seminar Date: | Thursday, July 12, 2012 |
| Time: | 12:30 PM - 1:30 PM |
| Location: | KIPAC Auditorium |
| Abstract: | Based on the full BaBar data sample, we report improved measurements of the ratios R(D(*)) = B(B -> D(*) Tau Nu)/B(B -> D(*) l Nu), where l 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 B -> D Tau Nu, with a significance of 6.8 sigma. |
| Speaker: | Manuel Franco-Sevilla - SLAC
 Dr Franco-Sevilla grew up in Ponferrada, a small town in Northern Spain. He went to Madrid to study electro-mechanical engineering at the Universidad Pontificia Comillas, but soon discovered a preference for fundamental science and math, so he began simultaneous studies of physics at the Universidad Complutense de Madrid. This was quite intense, but he completed his engineering degree in 2004, with a National award for the third best academic record.
After one more year of physics, but without a degree, he came to Stanford to pursue a PhD in Applied Physics. After rotations in materials science and ATLAS, he chose to work on the BaBar experiment with Professor Vera Luth. He defended his thesis on July 9th.
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