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SUMMARY:The Evaluation of the Leading Hadronic Contribution to the Muon g-
2: Toward the MUonE Experiment
DTSTART;VALUE=DATE-TIME:20200330T060000Z
DTEND;VALUE=DATE-TIME:20200403T160000Z
DTSTAMP;VALUE=DATE-TIME:20200219T210600Z
UID:indico-event-195@indico.mitp.Uni-Mainz.DE
DESCRIPTION:The aim of the topical workshop is to assess the state of the
art of the theoretical determination of the muon anomalous magnetic moment
\, aμ \, in view of the anticipated new measurement of the E989 Muon g-2
experiment in Fermilab\, which is expected to improve the present precisio
n by a factor of four\, and the new approach to measure aμ under developm
ent by the E34 collaboration at J-PARC. The workshop will focus on aμHLO
\, the leading hadronic contribution to the muon g-2\, both analyzing the
most recent experimental and theoretical results for its determination\, a
s well as taking into consideration the most recent dedicated lattice calc
ulations. Particular attention will be devoted to MUonE\, a recently propo
sed experiment at CERN which aims at measuring the running of the electrom
agnetic coupling constant in the spacelike region by scattering high-energ
y muons on atomic electrons of a low-Z target through the process μe →
μe. The differential cross section of this process provides the direct me
asurement of aμHLO and\, therefore\, an independent determination of the
theoretical prediction for aμ competitive with the timelike dispersive ap
proach. \nhttps://indico.mitp.uni-mainz.de/event/195/
LOCATION:02.430 (Mainz Institute for Theoretical Physics\, Johannes Gutenb
erg University)
URL:https://indico.mitp.uni-mainz.de/event/195/
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SUMMARY:Precision Tests with Neutral-Current Coherent Interactions with Nu
clei
DTSTART;VALUE=DATE-TIME:20200615T060000Z
DTEND;VALUE=DATE-TIME:20200619T160000Z
DTSTAMP;VALUE=DATE-TIME:20200219T210600Z
UID:indico-event-196@indico.mitp.Uni-Mainz.DE
DESCRIPTION:The MESA facility at Mainz will test the Standard Model (SM) a
nd beyond with low-energy polarized electron scattering. One of the corner
stones of the experimental program at MESA\, the P2 experiment\, is a ~1.8
% measurement of the proton’s weak charge via elastic parity-violating e
lectron scattering (PVES)\, resulting in a ~0.15% determination of the wea
k mixing angle. PVES on C-12 is under discussion as an additional avenue f
or several reasons. First of all\, such a measurement will serve as a cali
bration measurement to study the performance of the P2 experimental appara
tus. Moreover\, a measurement on C-12 is expected to enhance the physics o
utput of PVES@MESA as it will probe a different isospin combination of eff
ective 4-fermion operators. \n\nThe workshop is dedicated to presenting re
sults of presently ongoing studies and to identify those open problems whi
ch will have to be solved to ensure a successful C-12 physics program at M
ESA. \n\nThe physics case of PVES on C-12 will be discussed in a more gene
ral context: the coherent scattering of charged leptons and neutrinos with
nuclei\, that is scattering without exciting the nuclei or producing new
particles. Such coherent interactions involving conserved currents provide
a framework for setting up precision tests of the Standard Model at low e
nergies\, e.g. by measuring weak charges of hadrons. Strong interaction ef
fects cannot renormalize charges associated with conserved currents. Howev
er\, precision requirements of modern experiments are such that generally
small effects due to non-conserved currents appearing at higher order in t
he fine structure constant 𝛼\, and symmetry breaking effects have to be
taken into account when extracting those conserved charges from actual ex
perimental measurements. The challenges arising in precision calculations
of the observables\, experimental techniques\, exposure to possible effect
s due to non-standard particles and interactions allow us to cluster the m
ain focus of the workshop\, the physics case of PVES on C-12.\nhttps://ind
ico.mitp.uni-mainz.de/event/196/
LOCATION:02.430 (Mainz Institute for Theoretical Physics\, Johannes Gutenb
erg University)
URL:https://indico.mitp.uni-mainz.de/event/196/
END:VEVENT
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SUMMARY:Elliptic Integrals in Fundamental Physics
DTSTART;VALUE=DATE-TIME:20200907T060000Z
DTEND;VALUE=DATE-TIME:20200911T160000Z
DTSTAMP;VALUE=DATE-TIME:20200219T210600Z
UID:indico-event-212@indico.mitp.Uni-Mainz.DE
DESCRIPTION:Scattering amplitudes are the building blocks that allow us to
compute predictions for high-energy experiments like the Large Hadron Col
lider (LHC) at CERN. Despite their importance\, the computation of scatter
ing amplitudes is a very complex task. As the number of particles and/or t
he precision of the prediction increases\, one faces an exponential growth
in complexity and computations quickly become intractable. At the same ti
me\, the mathematical theory of the functions describing generic scatterin
g amplitudes needed for high precision is insufficiently developed. Novel
and powerful techniques are required in order to make precise predictions
for collider experiments.\n\nWhile there was a lot of progress over the la
st couple of years in understanding the mathematics of the functions that
appear in scattering amplitude computations\, it is known that new classes
of functions show up that are poorly understood even from the mathematica
l side. Therefore\, these so-called ”elliptic functions” are currently
an active area of research not only in collider physics\, but also in see
mingly disconnected areas like string theory and pure mathematics.\n\nThe
aim of the topical workshop is to bring together particle physicists\, str
ing theorists and mathematicians working on elliptic functions\, with the
grand goal of advancing our understanding of elliptic functions required t
o make precise predictions for future particle physics experiments.\nhttps
://indico.mitp.uni-mainz.de/event/212/
LOCATION:
URL:https://indico.mitp.uni-mainz.de/event/212/
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