[Theory-seminars] Seminars tomorrow

[Miguel Albaladejo]

Dear all,

below you can find the information about tomorrow's seminars.

Best regards,
Carlota,  Raza,  Miguel

Wednesday, July 31st, 1:00PM, Room F113

Nina Cao, "Constraining the glue in the pion through Drell-Yan lepton-pair production"

Abstract: Recently, a new global Monte Carlo analysis of parton distribution functions (PDFs) of the pion determined its valence quark distribution using Drell-Yan data from Fermilab and its sea quark and gluon PDFs from leading neutron electroproduction data from HERA. While that analysis provided greater constraints at small parton momentum fractions x, the pion's gluon PDF remains poorly known at large values of x. In the present study, we explore the extent to which transverse momentum (pT)-dependent Drell-Yan cross-section data can provide for greater sensitivity to the pion’s gluon PDF at large x. We present preliminary results of a combined QCD analysis of all available pT-integrated and pT-dependent pion data, which will provide the most complete imaging of the PDFs in the pioneer to date across all momentum fractions.



Alexandru Sturzu, "Scattering on a Finite, Minkowski 1+1D Lattice"

Abstract:  There has been recent developments to allow lattice calculations in Minkowski space-time in order to determine real-time observables. These still require the use of finite volumes, where scattering observables may not be accessed directly. Furthermore, it is not obvious how one can recover infinite-volume scattering amplitudes from finite-volume Minkowski observables. To address this issue,  we introduce a physical quantity that can be accessed from finite-volume Minkowski correlates and smoothly recovers the two-particle amplitude in the infinite volume limit. We test the convergence of this idea by considering a strongly interacting 1+1D toy  model.



Ben Slimmer,  "Examining the Finite Volume Spectra of Coupled Channel Scattering Interactions"

Abstract:  At Jefferson Lab and other nuclear research facilities around the world, experimental groups are exploring the spectrum of composite states of fundamental particles, hadrons. These experimental efforts require robust theoretical calculations to interpret results in the scope of quantum chromodynamics (QCD), the theory governing the strong nuclear force. The only known rigorous ab-initio method to study QCD is its lattice regularization, which places it on a space-time grid of points in a finite volume. This results in discrete energy spectra of the finite volume correlation functions. In his seminal work, Lüscher derived a mapping between the finite volume spectra of a two-hadron system to  the corresponding infinite volume elastic scattering amplitude, and further generalizations of the formalism now allow us to also study coupled channel scattering as well as other processes. In this study, we investigate the effect of different scattering amplitudes on the spectra; in particular, we are interested in the properties of coupled-channel scattering, like those where the a0(980) and f0(980) lie, and the associated spectra. This study presents our initial steps into understanding the photoproduction of hadronic resonances which couple to multiple strongly-coupled hadron-hadron systems.





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