[Theory-seminars] Reminder: Theory Seminar TODAY

[Marc Schlegel]

Dear all,

A reminder that there's a theory seminar at 1pm this afternoon (Monday) 
in L102/4:

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1pm, Monday Nov 9th
L102/4

**Electromagnetic Reactions and Structure of Light Nuclei**

Sonia Bacca (TRIUMF)

The investigation of light nuclei with ab-initio methods 
provides an optimal setting to probe our present knowledge 
of nuclear forces, since the few-nucleon problem can be
accurately solved. We believe, supported by recent advances in effective 
field theory, that nucleons interact not only in pairs but also via many-body forces. 
Theoretical efforts need to be taken towards the identification of bound and continuum 
nuclear observables sensitive to the less known many-nucleon forces. Electromagnetic 
reactions and structure properties of light nuclei close to the drip line can potentially 
provide us with useful informations on that. 
I will present new results on electron scattering off He4, with emphasis on the role
of three-body forces and on the comparison with experiment. I will also 
report about our investigation of light halo nuclei in the helium isotope chain.

 

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Also this week we have a cake seminar on Wednesday:

3pm, Wednesday Nov 11th
L102/104

*Lava flowing over pQCD: gamma* gamma -> pi^0*

Anatoly Radyshkin (JLab/ODU)

A scenario is investigated in which the leading-twist pion distribution 
amplitude phi_pi (x) is approximated by the pion decay constant f_pi 
for all essential values of the light-cone fraction x.

A model for the light-front wave function Psi(x,k_perp) is proposed that 
produces such a distribution amplitude and has a rapidly decreasing 
(exponential for definiteness) dependence on the light-front energy 
combination k_perp^2/x(1-x).

It is shown that this model easily reproduces the fit of recent 
large-Q^2 BaBar data on the photon-pion transition form factor. Some 
aspects of scenario with flat pion distribution amplitude are discussed. 


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A complete list of upcoming theory seminars and talks from previous
seminars are available from:
http://www.jlab.org/~thomasc/seminars/index.html


Thanks,
Marc