[Jlab-seminars] Fwd: Physics Seminar Thursday, 3 April 12:45 pm Small 122

[Mary Fox]

-------- Original Message --------
Subject: 	Physics Seminar Thursday, 3 April 12:45 pm Small 122
Date: 	Mon, 31 Mar 2014 14:17:19 +0000
From: 	Wilkinson, Eleonor V <evwilk at wm.edu>
To: 	'physics0607 at physics.wm.edu' <physics0607 at physics.wm.edu>
CC: 	'mfox at jlab.org' <mfox at jlab.org>



*PHYSICS SEMINAR*

Thursday, April 3, 2014

12:40 PM

Small Hall, Room 122

*Peter Stoffer *[Host: André Walker-Loud]

Bern University, Switzerland

Title of Talk:

*/"Dispersive Approach to Hadronic Light-by-Light Scattering and the 
Muon g-2"/*

*Abstract:*

The anomalous magnetic moment of the muon has been measured and computed 
to very high precision of about 0.5 ppm. For more than a decade, a 
discrepancy has persisted between the experiment and the Standard Model 
prediction, now of about 3.5 sigma. Forthcoming experiments at FNAL and 
J-PARC aim at reducing the experimental error by a factor of 4.

The main uncertainty of the theory prediction is due to strong 
interaction effects. At present, the largest uncertainty comes from 
hadronic vacuum polarisation, which, however, is expected to be reduced 
significantly with help of new data from e+e- experiments. In a few 
years, the subleading hadronic light-by-light (HLbL) contribution will 
become the dominating error.

So far, only model calculations of the HLbL contribution exist. 
Recently, we have published a first model-independent, dispersive 
approach to HLbL scattering (see arXiv:1402.7081). I will explain the 
ideas of our approach and highlight the advantages of a data-driven 
determination of the hadronic light-by-light contribution.

Everyone is invited to attend.

******

Eleonor V. Wilkinson

Administrative Coordinator

The College of William & Mary-Physics

Small Hall, Room 123

300 Ukrop Way

Williamsburg, VA 23185

Telephone: 757-221-3503

Fax: 757-221-3540



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