[Theory-seminars] Seminars next week

[Christopher Thomas]

Dear all,

Next week we have the following seminars:

* Monday Nov 9th, 1pm, L102/4: Sonia Bacca (TRIUMF, Canada):
"Electromagnetic Reactions and Structure of Light Nuclei"

* Wednesday Nov 11th, 3pm, L102/4: Informal Cake Seminar: Anatoly 
Radyushkin (JLab/ODU): "Lava flowing over pQCD: gamma* gamma -> pi^0"


Abstracts below:

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1pm, Monday Nov 9th
L102/4

*Electromagnetic Reactions and Structure of Light Nuclei*

Sonia Bacca (TRIUMF, Canada)

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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3pm, Wednesday Nov 11th
L102/4

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

Anatoly Radyushkin (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,
Christopher

-- 
Christopher Thomas

Jefferson Laboratory
12000 Jefferson Avenue
Suite #1
Newport News
VA 23606
USA

Tel: +1 (757) 269 7453
Email: thomasc at jlab.org