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SUMMARY:Exotic Atoms in Flight
DTSTART;VALUE=DATE-TIME:20110908T100500Z
DTEND;VALUE=DATE-TIME:20110908T103500Z
DTSTAMP;VALUE=DATE-TIME:20230207T153749Z
UID:indico-contribution-2251@indico.gsi.de
DESCRIPTION:Speakers: Stanley J. Brodsky (SLAC and Stanford University)\nT
he precision spectroscopy and decay properties of exotic atoms\, such as a
ntihydrogen and true muonium provide important tests of quantum electrodyn
amics as well as fundamental symmetries of the Standard Model. The produ
ction mechanisms for such exotic atoms are also of great interest\, since
they have important implications for analogous phenomena in hadron physic
s. For example\, the production of relativistic antihydrogen has led to a
new method for computing hadronization at the amplitude level in color-c
onfining quantum chromodynamics using the off-shell T-matrix for quarks an
d gluons and the boost-invariant light-front wavefunctions of hadrons. Con
versely\, the application of Dirac's front form\; i.e.\, light-front quan
tization\, provides a Lorentz-frame-independent description of atoms in f
light and unexpected insights into the Lorentz-boost properties of atomic
wavefunctions. The front-form also provides frame-independent relativistic
Hamiltonian methods for solving perturbative and non-perturbative problem
s in QED. I will also discuss other QED/QCD analogs such as nuclear-boun
d quarkonium -- heavy quark-antiquark states bound to hadrons and nuclei
through the QCD van der Waals interaction -- and "atomic alchemy" -- th
e conversion of muonic atoms to electronic atoms -- the atomic analog of e
xclusive flavor-changing B-meson weak decay. The unambiguous renormaliza
tion scale-setting procedure of QED provides the key for setting the renor
malization scales for processes in QCD\, independent of the choice of reno
rmalization scheme: the "principal of maximal conformality". The analysis
of QED scattering amplitudes which are sensitive to the Coulomb phase has
led to the discovery of analogous quark rescattering effects in QCD\, in
cluding nonzero factorization-breaking phenomena such as the pseudo-T-od
d Sivers effect in polarized-proton semi-inclusive deep inelastic lepto
n scattering reactions. Finally\, I will discuss how the use of light-fro
nt quantization resolves the apparent 10^{120} discrepancy between propert
ies of the QED vacuum and the measured cosmological constant.\n\nhttps://i
ndico.gsi.de/event/1221/contributions/2251/
LOCATION:Austrian Academy of Sciences\, Vienna Theatersaal
URL:https://indico.gsi.de/event/1221/contributions/2251/
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