[Jlab-seminars] Theory Center Seminars

[Mary Fox]

*JSA/HUGS Fellowships Seminars*
Wed., June 22, 2016
2:00 p.m. (coffee at 1:45 p.m.)
CEBAF Center, Room 102


*Rajesh Sangem*
Indian Institute of Technology
Bombay, India

*Linearly Polarized Gluons in J/\psi and \Upsilon Production*

In this talk, I would discuss the effect of linearly polarized gluons on 
transverse momentum and rapidity
spectrum of J/psi and Upsilon in unpolarized proton-proton collision. I 
will start with a brief introduction
to gluon TMDs and quarkonium models. I will show that quarkonium 
production spectra can be modulated
due to the presence of linearly polarized gluons inside an unpolarized 
proton.

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*S. Bineta L. Amar*
Cheikh Anta Diop University
Dakar, Senegal

*Meson Photo-production in GEANT4 for E_gamma = 0.15 - 3 GeV*
Theoretical models implemented in the version 9.6.p02 of the Geant4 
Monte Carlo simulation toolkit for the
total and differential cross sections for pion photo-production were 
validated against experimental data.
This presentation reports on the gamma p -> pi0 p reaction. Two models 
were studied: the Chiral Invariant
Phase Space (CHIPS) and Bertini (BERT). The experimental data are from 
the CEBAF Large Acceptance
Spectrometer (CLAS detector) of Jefferson Lab,the Scattering Analysis 
Interactive Dial-in (SAID) and the
world data (only for sigma_tot). The CHIPS model is the only one that 
can adequately reproduce the main
resonances for the reaction channel with a corrective coefficient needed 
to perform the result.


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