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SUMMARY:Effective and holographic methods for matter at a critical point
DTSTART;VALUE=DATE-TIME:20170630T120000Z
DTEND;VALUE=DATE-TIME:20170630T130000Z
DTSTAMP;VALUE=DATE-TIME:20170722T103300Z
UID:indico-event-634322@cern.ch
DESCRIPTION:Speakers: Oriol Pujolas Boix (Universitat Autònoma de Barcelo
na (ES))\nThe best understood tool to deal with strong dynamics -- effecti
ve Lagrangian methods -- does not apply for scale-invariant systems such a
s the materials near a quantum critical point. AdS/CFT methods can be unde
rstood as a type of effective field theory method that adapts to these cas
es. I will illustrate how this operates in the simple example of the elast
ic response for a (holographic) critical material. I will also discuss the
predictive reach of this approach.\nhttps://indico.cern.ch/event/634322/
LOCATION:4-3-006 - TH Conference Room (CERN)
URL:https://indico.cern.ch/event/634322/
END:VEVENT
BEGIN:VEVENT
SUMMARY:No Seminar - LHC and the Standard Model
DTSTART;VALUE=DATE-TIME:20170707T120000Z
DTEND;VALUE=DATE-TIME:20170707T130000Z
DTSTAMP;VALUE=DATE-TIME:20170722T103300Z
UID:indico-event-634323@cern.ch
DESCRIPTION:https://indico.cern.ch/event/634323/
LOCATION:
URL:https://indico.cern.ch/event/634323/
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BEGIN:VEVENT
SUMMARY:Generalized fragmentation functions for fractal jet observables
DTSTART;VALUE=DATE-TIME:20170714T120000Z
DTEND;VALUE=DATE-TIME:20170714T130000Z
DTSTAMP;VALUE=DATE-TIME:20170722T103300Z
UID:indico-event-636078@cern.ch
DESCRIPTION:Speakers: Massimiliano Procura (CERN)\nWe generalize the forma
lism of fragmentation functions to a broad class of jet observables that r
ecursively probe the collective properties of hadrons produced in jet frag
mentation. We discuss the nonlinear evolution of the corresponding general
ized fragmentation functions and consider also observables sensitive to hi
erarchical clustering trees. Applications include quark/gluon discriminati
on and the calculation up to next-to-leading logarithmic order of the thru
st distribution measured using only charged particles. \nhttps://indico.c
ern.ch/event/636078/
LOCATION:4-3-006 - TH Conference Room (CERN)
URL:https://indico.cern.ch/event/636078/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Interference in Showering: The LPM effect\, what it is\, a
nd why its theoretical development is still interesting 70 years later.
DTSTART;VALUE=DATE-TIME:20170721T120000Z
DTEND;VALUE=DATE-TIME:20170721T130000Z
DTSTAMP;VALUE=DATE-TIME:20170722T103300Z
UID:indico-event-654113@cern.ch
DESCRIPTION:Speakers: Peter Arnold (University of Virginia)\nExtremely hig
h-energy particles traveling through matter (the atmosphere\, quark-gluon
plasmas\, whatever) lose energy by showering -- a sequence of splittings v
ia hard bremsstrahlung or pair production. At high enough energy\, the "du
ration" of each individual splitting becomes longer than the mean free tim
e for collisions with the medium\, giving rise to an interference effect k
nown as the Landau-Pomeranhcuk-Migdal (LPM) effect\, which drastically cha
nges the rate of shower development and so of energy loss. For QED\, thi
s effect was realized theoretically in the 1950s in the context of cosmic
ray showers. For QCD\, the formalism was first worked out in the 1990s\,
with applications to jet energy loss in quark-gluon plasmas. I will rev
iew the LPM effect\, more recent developments in the QCD case\, and why it
is still an extremely rich and interesting field theory problem.\nhttps:/
/indico.cern.ch/event/654113/
LOCATION:4-3-006 - TH Conference Room (CERN)
URL:https://indico.cern.ch/event/654113/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resonances and scattering processes from lattice QCD
DTSTART;VALUE=DATE-TIME:20170804T120000Z
DTEND;VALUE=DATE-TIME:20170804T130000Z
DTSTAMP;VALUE=DATE-TIME:20170722T103300Z
UID:indico-event-653475@cern.ch
DESCRIPTION:Speakers: David Wilson (Trinity College Dublin)\nhttps://indic
o.cern.ch/event/653475/
LOCATION:4-3-006 - TH Conference Room (CERN)
URL:https://indico.cern.ch/event/653475/
END:VEVENT
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SUMMARY:Iterated Elliptic and Hypergeometric Integrals for Feynman Diagram
s
DTSTART;VALUE=DATE-TIME:20171013T120000Z
DTEND;VALUE=DATE-TIME:20171013T130000Z
DTSTAMP;VALUE=DATE-TIME:20170722T103300Z
UID:indico-event-654175@cern.ch
DESCRIPTION:Speakers: Johannes Bluemlein (DESY)\nWe calculate 3-loop maste
r integrals for heavy quark correlators and the 3-loop QCD corrections to
the rho-parameter. They obey non-factorizing differential equations of sec
ond order with more than three singularities\, which cannot be factorized
in Mellin-N space either. The solution of the homogeneous equations is pos
sible in terms of convergent close integer power series as 2_F_1 Gauss hyp
ergeometric functions at rational argument. In some cases\, integrals of t
his type can be mapped to complete elliptic integrals at rational argument
. This class of functions appears to be the next one arising in the calcul
ation of more complicated Feynman integrals following the harmonic polylog
arithms\, generalized polylogarithms\, cyclotomic harmonic polylogarithms\
, square-root valued iterated integrals\, and combinations thereof\, which
appear in simpler cases. The inhomogeneous solution of the corresponding
differential equations can be given in terms of iterative integrals\, wher
e the new innermost letter itself is not an iterative integral. A new clas
s of iterative integrals is introduced containing letters in which (multip
le) definite integrals appear as factors. For the elliptic case\, we also
derive the solution in terms of integrals over modular functions and also
modular forms\, using q-product and series representations implied by Jaco
bi's theta_i functions and Dedekind's eta-function. The corresponding repr
esentations can be traced back to polynomials out of Lambert--Eisenstein s
eries\, having representations also as elliptic polylogarithms\, a q-facto
rial 1/eta^k(\\tau)\, logarithms and polylogarithms of q and their q-int
egrals. Due to the specific form of the physical variable x(q) for differe
nt processes\, different representations do usually appear. The present re
sults cover classes of elliptic solutions of a more general kind than thos
e of the well-known sunrise and kite diagrams. Numerical results for the s
olutions are also presented.\nhttps://indico.cern.ch/event/654175/
LOCATION:4-3-006 - TH Conference Room (CERN)
URL:https://indico.cern.ch/event/654175/
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