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SUMMARY:Magnetic Wilson loops in the classical field of high-energy heavy-
ion collisions
DTSTART;VALUE=DATE-TIME:20150115T112900Z
DTEND;VALUE=DATE-TIME:20150115T114300Z
DTSTAMP;VALUE=DATE-TIME:20190318T233141Z
UID:indico-contribution-530-2939@indico.in2p3.fr
DESCRIPTION:Speakers: Elena Petreska (CPHT - Ecole Polytechnique)\nThe fie
ld configuration in the first moments of high-energy heavy-ion collisions
is represented by strong longitudinal chromo-electric and chromo-magnetic
fields. The form of these fields is obtained by solving the classical Yang
-Mills equations of motion for two color charge sheets passing through eac
h other with appropriate boundary conditions on the light cone. We calcula
te perturbatively the expectation value of the magnetic Wilson loop operat
or in the first moment of the collision. For the magnetic flux we obtain a
first non-trivial term that is proportional to the square of the area of
the loop. The result agrees with numerical calculations for small area loo
ps. Screening effects are not present in the analytical calculation. A num
erical result for larger loops gives an area law behavior of the flux\, wh
ich indicates existence of independent magnetic vortices over distance sca
les up to few times the inverse saturation scale.\n\nhttps://indico.in2p3.
fr/event/10699/contributions/2939/
LOCATION:Institut Henri Poincaré Chair: Jean-Philippe Lansberg\, Amphi He
rmite
URL:https://indico.in2p3.fr/event/10699/contributions/2939/
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BEGIN:VEVENT
SUMMARY:Ab-initio calculation of the neutron-proton mass difference
DTSTART;VALUE=DATE-TIME:20150115T103300Z
DTEND;VALUE=DATE-TIME:20150115T104700Z
DTSTAMP;VALUE=DATE-TIME:20190318T233141Z
UID:indico-contribution-530-2933@indico.in2p3.fr
DESCRIPTION:Speakers: Laurent Lellouch (CPT Marseille)\nThe difference bet
ween the masses of the neutron and the proton is only 0.14% of their avera
ge. Yet this difference has important implications for the existence and s
tability of ordinary matter. After explaining how electromagnetic and mass
isospin breaking effects can be included in lattice QCD computations\, I
will show how this mass difference arises from a subtle cancellation of th
ese two effects. I will also report on results for splittings in the $\\Si
gma$\, $\\Xi$\, $D$ and $\\Xi_{cc}$ isospin multiplets\, some of which are
predictions. As will be explained\, the results are obtained from an ab-i
nitio calculation in full lattice QCD plus QED\, that includes the effects
of non-degenerate up\, down\, strange and charm quarks in the sea.\n\nhtt
ps://indico.in2p3.fr/event/10699/contributions/2933/
LOCATION:Institut Henri Poincaré Chair: Jean-Philippe Lansberg\, Amphi He
rmite
URL:https://indico.in2p3.fr/event/10699/contributions/2933/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pion couplings to the scalar B meson
DTSTART;VALUE=DATE-TIME:20150115T104700Z
DTEND;VALUE=DATE-TIME:20150115T110100Z
DTSTAMP;VALUE=DATE-TIME:20190318T233141Z
UID:indico-contribution-530-2928@indico.in2p3.fr
DESCRIPTION:Speakers: Antoine Gérardin (Laboratoire de Physique Corpuscul
aire (LPC))\nComputing the quark propagator on the lattice gets more and m
ore difficult as the light quark becomes small and approach its physical v
alue. Therefore\, most simulations are performed at unphysical light quark
masses and the results are extrapolated to the physical mass using fit fo
rmulae inspired by chiral perturbation theory. In the case of heavy-light
mesons\, one can use the Heavy Meson Chiral Perturbation Theory parametriz
ed\, at leading order\, by three couplings $g$\, $\\tilde{g}$ and $h$. \nI
n this talk\, I will present a lattice computation of the couplings $\\til
de{g}$ and $h$ which appear when positive parity states are taken into acc
ount. In particular\, I will show that the coupling $h$ is large and canno
t be neglected in chiral loops.\nThe lattice simulations are performed on
a set of $N_f = 2$ dynamical quarks configurations made available by the L
attice Coordinated Simulations effort.\n\nhttps://indico.in2p3.fr/event/10
699/contributions/2928/
LOCATION:Institut Henri Poincaré Chair: Jean-Philippe Lansberg\, Amphi He
rmite
URL:https://indico.in2p3.fr/event/10699/contributions/2928/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Random Matrix Theory for Wilson-Dirac Operator
DTSTART;VALUE=DATE-TIME:20150115T110100Z
DTEND;VALUE=DATE-TIME:20150115T111500Z
DTSTAMP;VALUE=DATE-TIME:20190318T233141Z
UID:indico-contribution-530-2922@indico.in2p3.fr
DESCRIPTION:Speakers: Savvas Zafeiropoulos (Goethe Universitaet Frankfurt)
\nWe summarize recent analytical results obtained for the discretization e
ffects of the non-Hermitian Wilson Dirac operator. We include the effect o
f all three leading low energy constants in our analysis. In particular we
discuss the results for the eigenvalue densities close to the continuum l
imit but we also consider the case of large lattice spacing which is close
ly related to the mean field limit. Finally\, we extract simple relations
between measurable spectral quantities and the low energy constants. These
relations serve as a new way to measure the additional low energy constan
ts of Wilson chiral perturbation theory.\n\nhttps://indico.in2p3.fr/event/
10699/contributions/2922/
LOCATION:Institut Henri Poincaré Chair: Jean-Philippe Lansberg\, Amphi He
rmite
URL:https://indico.in2p3.fr/event/10699/contributions/2922/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Characterizing New physics with Polarized Beams at High-Energy Had
ron Colliders
DTSTART;VALUE=DATE-TIME:20150115T111500Z
DTEND;VALUE=DATE-TIME:20150115T112900Z
DTSTAMP;VALUE=DATE-TIME:20190318T233141Z
UID:indico-contribution-530-2912@indico.in2p3.fr
DESCRIPTION:Speakers: Josselin Proudom (LPSC)\n## Motivations ##\n - Statu
s of New Physics searches at the LHC\n - Why using polarized beams for New
Physics searches?\n - Future Accelerators & Polarized beams\n\n## Physics
at polarized hadron colliders ##\n - Polarized Parton Distribution Functi
ons\n - Parton luminosities & cross sections\n - Longitudinal spin asymmet
ries\n\n## Physics case: Monotop signature ##\n - Monotop production in th
e Standard model\n - Monotop production in the RPV-MSSM\n - Monotop produc
tion in the Hylogenesis model\n - Monotop production in the X-model\n\n##
Conclusions ##\n\nhttps://indico.in2p3.fr/event/10699/contributions/2912/
LOCATION:Institut Henri Poincaré Chair: Jean-Philippe Lansberg\, Amphi He
rmite
URL:https://indico.in2p3.fr/event/10699/contributions/2912/
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SUMMARY:Describing hadron structure using Dyson-Schwinger equations
DTSTART;VALUE=DATE-TIME:20150115T100500Z
DTEND;VALUE=DATE-TIME:20150115T101900Z
DTSTAMP;VALUE=DATE-TIME:20190318T233141Z
UID:indico-contribution-530-2907@indico.in2p3.fr
DESCRIPTION:Speakers: Cédric Mezrag (IRFU/SPhN)\nIf at high energy QCD ca
n be described using perturbation theory due to asymptotic freedom\, when
going at low energy the fundamental degrees of freedom of the theory\, qua
rks are gluons\, are bounded inside hadrons. The hadron structure in terms
of partons has been studied since the 1960s. Today several objects have b
een both theoretically and experimentally studied\, like for instance Gen
eralized Parton Distributions (GPDs) which contains a three dimensional in
formation about the parton structure of hadrons. However\, it is still not
possible to compute such objects directly from QCD first principles. As a
first step toward this ideal goal\, we have developed here a model for th
e pion GPD based on the Dyson-Schwynger equations\, which are a way to com
pute QCD non pertubative Green functions. We have successfully compared ou
r model with available experimental data of pion form factor and pion Part
on Distribution Function (PDF)\, and managed to sketch the partonic 3D str
ucture of the pion.\n\nhttps://indico.in2p3.fr/event/10699/contributions/2
907/
LOCATION:Institut Henri Poincaré Chair: Jean-Philippe Lansberg\, Amphi He
rmite
URL:https://indico.in2p3.fr/event/10699/contributions/2907/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Octet baryon masses in covariant baryon chiral perturbation theory
DTSTART;VALUE=DATE-TIME:20150115T101900Z
DTEND;VALUE=DATE-TIME:20150115T103300Z
DTSTAMP;VALUE=DATE-TIME:20190318T233141Z
UID:indico-contribution-530-2885@indico.in2p3.fr
DESCRIPTION:Speakers: Xiu-Lei REN (IPN Orsay)\nWe study the ground-state o
ctet baryon masses and sigma terms using the covariant baryon chiral pertu
rbation theory (ChPT) with the extended-on-mass-shell (EOMS) renormalizati
on scheme up to next-to-next-to-next-to-leading order (N$^3$LO). In order
to systematically study the lattice QCD data and to fix the low-energy con
stants (LECs)\, the finite-volume corrections (FVCs) and finite lattice sp
acing discretization effects of LQCD simulations are included self-consist
ently.\n\nThrough a simultaneous fit of all the publicly available $n_f =
2+1$ lattice QCD data from the PACS-CS\, LHPC\, HSC\, QCDSF-UKQCD and NPLQ
CD collaborations\, it shows that the N$^3$LO EOMS BChPT can give a reason
able fit with $\\chi^2/\\mathrm{d.o.f.} = 1.0$ and the various lattice sim
ulations seem to be consistent with each other. We also conclude that the
finite lattice spacing discretization effects up to $\\mathcal{O}(a^2)$ ca
n be safely ignored. Finally\, the octet baryon sigma terms are predicted
via the Feynman-Hellmann theorem. In particular\, the pion- and strangenes
s-nucleon sigma terms are $\\sigma_{\\pi N} = 55(1)(4)$ MeV and $\\sigma_{
sN} = 27(27)(4)$ MeV\, respectively.\n\nhttps://indico.in2p3.fr/event/1069
9/contributions/2885/
LOCATION:Institut Henri Poincaré Chair: Jean-Philippe Lansberg\, Amphi He
rmite
URL:https://indico.in2p3.fr/event/10699/contributions/2885/
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