[Jlab-seminars] Fwd: [Theory-seminars] For your information: Seminar at William and Mary. Thursday, April 3.

[Mary Fox]

-------- Original Message --------
Subject: 	[Theory-seminars] For your information: Seminar at William and 
Mary. Thursday, April 3.
Date: 	Wed, 2 Apr 2014 16:44:01 -0400 (EDT)
From: 	Cesar Fernandez-Ramirez <cesar at jlab.org>
To: 	theory-seminars at jlab.org



Date and Place:
Thursday April 3
12:40-1:40
Small Hall Room 122
Physis Department
College of William and Mary

Speaker: Peter Stoffer, University of Bern and Los Alamos National Laboratory

Title: 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.



-- 
César Fernández-Ramírez

Theory Center -- Jefferson Lab
12000 Jefferson Ave., Newport News, VA 23606, USA

Phone: (+1) 757-269-7844
Fax: (+1) 757-269-7002
E-mail: cesar at jlab.org

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