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SUMMARY:Generalized TMDs in hadronic collisions
DTSTART;VALUE=DATE-TIME:20180517T203000Z
DTEND;VALUE=DATE-TIME:20180517T205000Z
DTSTAMP;VALUE=DATE-TIME:20211128T054839Z
UID:indico-contribution-629-3135@indico.jlab.org
DESCRIPTION:Speakers: Shohini Bhattacharya (Temple University)\nBeing the
"mother distributions" of all types of two-parton correlation functions\,
generalized TMDs (GTMDs) have garnered a lot of attention. We address the
important question of how to access GTMDs in physical processes. Recently\
, we have shown that quark GTMDs can in principle be probed through the ex
clusive pion-nucleon double Drell-Yan process\, where the focus was on two
particular GTMDs only. We now present new results concerning access to th
e remaining quark GTMDs in the same process. Extending our analysis\, we a
lso show that GTMDs for gluons can be explored via exclusive double $\\eta
_c$ production in hadronic collisions.\n\nhttps://indico.jlab.org/event/25
2/contributions/3135/
LOCATION:Jefferson Lab - CEBAF Center Auditorium
URL:https://indico.jlab.org/event/252/contributions/3135/
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SUMMARY:Power corrections to TMD factorization for particle production
DTSTART;VALUE=DATE-TIME:20180517T201000Z
DTEND;VALUE=DATE-TIME:20180517T203000Z
DTSTAMP;VALUE=DATE-TIME:20211128T054839Z
UID:indico-contribution-629-3140@indico.jlab.org
DESCRIPTION:Speakers: Ian Balitsky (JLab/ODU)\nA typical factorization for
mula for production of a particle with a small transverse momentum in had
ron-hadron collisions is given\nby a convolution of two TMD parton densiti
es with cross section of production of the final particle by the two parto
ns. \nFor practical applications at a given transverse momentum\, though\
, one should estimate at what momenta \nthe power corrections to the TMD
factorization formula become essential. In this talk I present the resul
ts of calculation of\n first power corrections to TMD factorization formul
a for Z-boson production and Drell-Yan process in high-energy hadron-hadro
n collisions. \nAt the leading order in $N_c$ power corrections are expres
sed in terms of leading power TMDs by QCD equations of motion.\n\nhttps://
indico.jlab.org/event/252/contributions/3140/
LOCATION:Jefferson Lab - CEBAF Center Auditorium
URL:https://indico.jlab.org/event/252/contributions/3140/
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BEGIN:VEVENT
SUMMARY:Trident pair production in lightfront quantization
DTSTART;VALUE=DATE-TIME:20180517T211000Z
DTEND;VALUE=DATE-TIME:20180517T213000Z
DTSTAMP;VALUE=DATE-TIME:20211128T054839Z
UID:indico-contribution-629-3142@indico.jlab.org
DESCRIPTION:Speakers: Greger Torgrimsson (Theoretisch-Physikalisches Insti
tut Friedrich-Schiller-Universität Jena\; Helmholtz Institute Jena)\nHigh
-intensity lasers currently attract a great deal of interest due to the pr
ospects of using them to study unexplored regimes of fundamental physics.
Trident pair production is a basic process in this field\, where an electr
on collides with a laser and produces an electron-positron pair. One part
of this is a two-step process where the initial electron emits a real\, on
-shell photon that subsequently decays into an electron-positron pair\, an
d the rest is referred to as a one-step process. We have [1] studied the s
plit between these one- and two-step processes using lightfront quantizati
on\, motivated by the facts that in this formalism all particles are on-sh
ell and the Hamiltonian has instantaneous terms. Apart from providing new
insights into trident\, this formalism has also allowed us to calculate im
portant terms that have previously been neglected. \n \nReferenc
e \n \n[1] V. Dinu and G. Torgrimsson\,\n``Trident pair prod
uction in plane waves: Coherence\, exchange\, and spacetime inhomogeneity'
'\,\nPhys. Rev. D 97 (2018) 036021\n\nhttps://indico.jlab.org/event/252/co
ntributions/3142/
LOCATION:Jefferson Lab - CEBAF Center Auditorium
URL:https://indico.jlab.org/event/252/contributions/3142/
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SUMMARY:-
DTSTART;VALUE=DATE-TIME:20180517T215000Z
DTEND;VALUE=DATE-TIME:20180517T221000Z
DTSTAMP;VALUE=DATE-TIME:20211128T054839Z
UID:indico-contribution-629-3155@indico.jlab.org
DESCRIPTION:https://indico.jlab.org/event/252/contributions/3155/
LOCATION:Jefferson Lab - CEBAF Center Auditorium
URL:https://indico.jlab.org/event/252/contributions/3155/
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SUMMARY:Light-Front Simulations of the True Muonium
DTSTART;VALUE=DATE-TIME:20180517T213000Z
DTEND;VALUE=DATE-TIME:20180517T215000Z
DTSTAMP;VALUE=DATE-TIME:20211128T054839Z
UID:indico-contribution-629-3228@indico.jlab.org
DESCRIPTION:Speakers: Henry Lamm (University of Maryland)\nA light-front q
uantization study of the nonperturbative\n spectrum of the bound state $(
\\mu^+\\mu^-)$\, true muonium\, has been\n performed. Using Pad\\'{e} ap
proximants\, it has been possible to\n extract continuum and infinite-cut
off limits for the singlet and\n triplet states for a range of coupling c
onstants $\\alpha$. This allows for an investigation of the $\\alpha$ dep
endence of the light-front spectra\, the results of which are compared to
standard calculations. Decay constants have also been\n obtained. Impro
ved calculations have been undertaken for the energy\n shifts due to the
presence of a second\, lighter flavor ($e$).\n Finally\, initial results
for three-flavor ($e$\, $\\mu$\, $\\tau$)\n calculations are presented.\n
\nhttps://indico.jlab.org/event/252/contributions/3228/
LOCATION:Jefferson Lab - CEBAF Center Auditorium
URL:https://indico.jlab.org/event/252/contributions/3228/
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SUMMARY:Non-perturbative study of the three-body system within the Bethe-S
alpeter approach
DTSTART;VALUE=DATE-TIME:20180517T205000Z
DTEND;VALUE=DATE-TIME:20180517T211000Z
DTSTAMP;VALUE=DATE-TIME:20211128T054839Z
UID:indico-contribution-629-3231@indico.jlab.org
DESCRIPTION:Speakers: Emanuel Ydrefors (Instituto Tecnologico de Aeronauti
ca)\nFrom a general point of view\, understanding the interaction in terms
of the fundamental degrees of freedom is very important for nuclear and p
article non-perturbative physics. Since that is a very difficult problem\,
simple models are of great value for understanding the crucial qualitativ
e features of the solution with more realistic kernels. Understanding the
properties of relativistic three-body systems is important\, in particular
\, for the perspective of hardron physics\, e.g. for the modeling of the n
ucleon. Furthermore\, it is well-known that in the non-relativistic approa
ch the binding energy of this system is not bounded from below\, what is k
nown as Thomas collapse. As it was discovered in the light-front dynamics
(LFD) [1\,2]\, the relativistic repulsion prevent the Thomas collapse in t
he non-relativistic sense.\n\nThe Bethe-Salpeter equation provides a conve
nient approach to perform non-perturbative studies of few-body systems in
Minkowski space. Calculations of that type is important in order to access
dynamical observables\, such as space-like and time-like form factors. In
this contribution we discuss some recent progress regarding the solution
of the bound-state Bethe-Salpeter equation (BSE) for a system of three bos
ons interacting through a zero-range interaction. We compare the results f
or the binding energy and transverse amplitude computed by two different m
ethods:\n\n 1. Solution in Minkowski space by direct integration of the BS
E\, by taken care of the singularities. The adopted is thus similar to the
one introduced by Carbonell and Karmanov for the two-body system in Ref.
[3].\n 2. Solution in Euclidean space by Wick rotation of the integration
contour.\n\nOur results show that\, at least for moderate three-body bindi
ng energies\, a fair agreement is found between the two methods\, both for
the binding energy and the modulus of the transverse amplitude. This is e
ncouraging since the calculations based on direct integration of the BSE
present many challenges\, due to the singularities of the kernel and the B
ethe-Salpeter amplitude.\n\nAs our calculations in Euclidean space show [4
]\, the contributions from higher Fock components\, which are not include
d in the LFD treatment are very significant\, both for the binding energie
s and the tranverse amplitudes. This can be explained in terms of an effe
ctive three-body force of relativistic origin.\n\n\n[1] T. Frederico\, Ph
ys. Lett. B 282 (1992) 409\n\n[2] J. Carbonell and V. A. Karmanov\, Phys.
Rev. C 67 (2003) 037001\n\n[3] J. Carbonell and V. A. Karmanov\, Phys. Rev
. D 90 (2014) 056002\n\n[4] E. Ydrefors et al\, Phys. Lett. B 770 (2017) 1
31.\n\nhttps://indico.jlab.org/event/252/contributions/3231/
LOCATION:Jefferson Lab - CEBAF Center Auditorium
URL:https://indico.jlab.org/event/252/contributions/3231/
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