Searches for Physics beyond the Standard Model using charm mesons at B factories

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Date/Time:Wednesday, 18 Apr 2012 from 4:10 pm to 5:10 pm
Location:A401, Zaffarano Hall
Contact:Chunhui Chen
Channel:High Energy Physics
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Dr. Riccardo Cenci, University of Maryland

At the end of 2011 one of the most relevant hint of new physics discovered by LHC experiments is a 3.5 sigma evidence of CP violation in the time integrated D0->h+h- decay rates (PRL 108,111602(2012)). If confirmed, the size of the CP violation here does not agree with the Standard Model prediction but, following this measurement, many theoretical studies were released about how this evidence can still be explained within the Standard Model (e.g. arXiv:1111.5000 [hep-ph]). While experiments as LHCb are going to have soon the largest sample of charm mesons, B-factories can still be competitive in searching for CPV in the charm sector, specially for the decay modes that involves neutral particles.

In this seminar we are going to present an overview of the most recent charm physics results that have been performed by BaBar and Belle collaborations (PRL 104,181602(2010), PRD 83,071103(2011) and PRL 106, 211801 (2011)). Given the small size of expected CP violation (0.3% or less), these analyses are quite challenging from the experimental point of view. We will describe in detail the analysis technique and the systematic error estimation method adopted to obtain very small uncertainties that can reach a value of ~0.1% for the high-statistics decay modes.