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SUMMARY:First observation of two-neutrino double electron capture in 124Xe
with XENON1T
DTSTART;VALUE=DATE-TIME:20190429T114500Z
DTEND;VALUE=DATE-TIME:20190429T115500Z
DTSTAMP;VALUE=DATE-TIME:20210918T043657Z
UID:indico-contribution-19034-71643@indico.in2p3.fr
DESCRIPTION:Speakers: Chloé Therreau (Subatech)\nTwo-neutrino double elec
tron capture (2vECEC) is a rare nuclear process in which two protons are c
onverted into two neutrons by the absorption of two atomic electrons\, wit
h the emission of two neutrinos. The half-life of such decays surpasses th
e age of the Universe by many order of magnitude and a ultra-low backgroun
d experiment is required to detect them. In this talk\, the detection of 2
vECEC of Xe-124 with the ultra-low background experiment XENON1T\, built f
or dark matter search\, is presented.\n\nThe corresponding half-life T =(1
.8 ±0.5(stat) ± 0.1 (syst))x10^22 y is longest ever measured directly.\n
\nhttps://indico.in2p3.fr/event/19034/contributions/71643/
LOCATION:Subatech - IMT Atlantique Amphi G.BESSE
URL:https://indico.in2p3.fr/event/19034/contributions/71643/
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SUMMARY:Determination of QGP Parameters from a global Bayesian analysis
DTSTART;VALUE=DATE-TIME:20190429T120000Z
DTEND;VALUE=DATE-TIME:20190429T130000Z
DTSTAMP;VALUE=DATE-TIME:20210918T043657Z
UID:indico-contribution-19034-70999@indico.in2p3.fr
DESCRIPTION:Speakers: Steffen Bass (DUKE Trinity College of Arts and Scien
ce)\nCollisions of heavy nuclei at ultrarelativistic velocities are curren
tly utilized at the Relativistic Heavy-Ion Collider (RHIC) and the Large H
adron Collider (LHC) to recreate matter at temperatures and densities as h
ave only existed in the early Universe\, a couple of microseconds after th
e Big Bang. This state of matter\, consisting of deconfined quarks and glu
ons is often termed the Quark-Gluon- Plasma.\nA primary goal of heavy-ion
physics is the measurement of the fundamental properties of the quark-gluo
n plasma (QGP)\, notably its transport coefficients and initial state prop
erties. Since these properties are not directly measurable\, one relies o
n a comparison of experimental data to computational models of the time-ev
olution of the collision to connect measured observables to the properties
of the transient QGP state. These model-to-data comparisons are non-triv
ial due to the large number of model parameters and the non-factorizing se
nsitivity of measured observables to multiple parameters.\n\nOver the last
few years the Duke QCD group has developed techniques based on Bayesian s
tatistics that allow for the simultaneous calibration of a large number of
model parameters and the precision extraction of QGP properties including
their quantified uncertainties. The computational model used is based on
the Trento initial condition model\, viscous relativistic hydrodynamics an
d a microscopic hadronic transport to describe the off-equilibrium late st
age hadronic evolution. The analysis starts by selecting a set of salient
model parameters -- including physical properties such as temperature and/
or momentum dependent transport coefficients -- then evaluates the event-b
y-event heavy-ion collision model at a small set of points in the multidim
ensional parameter space\, varying all parameters simultaneously. Gaussia
n process emulators are used to non-parametrically interpolate the paramet
er space\, providing fast predictions at any point in parameter space with
quantitative uncertainty. Finally\, the parameter space is systematicall
y explored using a Markov chain Monte Carlo (MCMC) to obtain rigorous cons
traints on all parameters simultaneously\, including all correlations amon
g the parameters.\n\nIn this talk I will review the basic components of th
e Bayesian analysis and discuss recent progress in the determination of QG
P initial conditions and transport coefficients.\n\nhttps://indico.in2p3.f
r/event/19034/contributions/70999/
LOCATION:Subatech - IMT Atlantique Amphi G.BESSE
URL:https://indico.in2p3.fr/event/19034/contributions/70999/
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