[Theory-seminars] Postdoc interviews. January 14. Room L102. Starting at 9am

[Cesar Fernandez-Ramirez]

Dear all,

find enclosed times, speakers, titles and abstract for tomorrow interviews. 

Cheers,

Cesar


- Speaker: En Wang
- Time: 9.00am
- Place: CC L102
- Title: Photon emission in neutron current interactions with nucleons and nuclei
- Abstract: I will report on the study of photon emission induced by E_nu ∼ 1 GeV (anti)neutrino neutral current interactions with nucleons and nuclei. This process is an important background for nu_e appearance oscillation experiments. At the relevant energies, the reaction is dominated by the excitation of the ∆(1232) resonance, but there are also non-resonant contribution, that, close to threshold, are fully determined by the effective chiral Lagrangian of strong interactions. In addition, we also consider the heavier resonances contributions in high energy region. With our model, we predict the events number of photon emission of the NC interactions in the MiniBooNE experiments and T2K experiment.

- Speaker: Osvaldo Gonzalez
- Time: 9.50am
- Place: CC L102
- Title: Phenomenology of the 3D structure of the nucleon
- Abstract: The outstanding developments in recent years in studies of the the 3D structure of the nucleon have uncovered a picture where the quarks and gluons longitudinal and transverse motion is correlated with both their spin and with the nucleon's spin. The 3D structure of the nucleon is encoded in transverse momentum distribution (TMD) functions and Generalized Parton Distributions (GPDs) which allow us to access transverse spatial distributions.
Accessing information on the 3D structure of the nucleon poses many challenges that cannot be resolved without bridging the gap between theory and experiment. I will briefly discuss about the importance of model building in learning about fundamental properties of the proton. A hybrid model for GPDs will be discussed, as well as new phenomenological studies of TMDs, motivated by recent semi-inclusive deep inelastic scattering data

- Speaker: Diego Lonardoni
- Time: 10.40am
- Place: CC L102
- Title: Strangeness in nuclei and neutron stars: a challenging puzzle
- Abstract: The onset of strange baryons in the core of neutron stars and the consequent softening of the equation of state have been questioned for a long time. Controversial theoretical predictions about the maximum mass of neutron stars and the recent astrophysical observations are the grounds for the so-called hyperon puzzle. We attempt to give our contribution to the discussion by studying the general problem of the hyperon-nucleon interaction by means of Auxiliary Field Diffusion Monte Carlo calculations. We employ a phenomenological approach showing that a three-body hyperon-nucleon force provides the strong repulsive contribution needed to correctly describe the systematics of medium-light Λ-hypernuclei [1,2]. The same potential has been used to determine the equation of state and the mass-radius relation of an infinite systems of neutrons and Λ particles. We find that the three-body hyperon-nucleon force has a dramatic effect on the equation of state and the predicted maximum mass [3]. Our results suggest that more constraints on the nature of hyperon-neutron forces are needed before drawing any conclusion on the role played by hyperons in neutron stars.
[1] D. Lonardoni, S. Gandolfi, F. Pederiva, Phys. Rev. C 87, 041303(R) (2013)
[2] D. Lonardoni, F. Pederiva, S. Gandolfi, Phys. Rev. C 89, 014314 (2014)
[3] D. Lonardoni, A. Lovato, S. Gandolfi, F. Pederiva, arXiv:1407.4448 [nucl-th] (2014), submitted to Phys. Rev. Lett.



-- 
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