11 research outputs found
Probing the Weak Boson Sector in
We study possible deviations from the standard model in the reaction at a 500 GeV collider. As a photon source we use a
laser backscattered photon beam. We investigate the most general and vertices including operators up to
energy-dimension-six which are Lorentz invariant. These vertices require four
extra parameters; two are CP-conserving, and , and two are
CP-violating, and . We present analytical expressions of
the helicity amplitudes for the process for arbitrary
values of anomalous couplings. Assuming Standard Model values are actually
measured we present the allowed region in the () plane at the
90\% confidence level. We then show how the angular correlation of the
decay products can be used to extract detailed information on the anomalous
(especially CP-violating) and couplings.Comment: Latex, 25 pages, 12 figures (not included). One compressed postscript
file including all the figures available at
ftp://ftp.kek.jp/kek/preprints/TH/TH-420/kekth420.ps.g
Hadronic Production with QCD Corrections and Leptonic Decays
The process , where
denotes a lepton, is calculated to order . Total and differential
cross sections, with acceptance cuts imposed on the leptons and photon, are
given for the Tevatron and LHC center of mass energies. In general, invariant
mass and angular distributions are simply scaled up in magnitude by the QCD
radiative corrections, whereas in transverse momentum distributions, the QCD
radiative corrections increase with the transverse momentum.Comment: 16 pages + 9 figures, UCD-94-29. A postscript version and 9
postscript figures are available via anonymous ftp to UCDHEP.UCDAVIS.EDU in
the directory [.ohnemus.ucd-94-29
Resolving Ordering Ambiguities in the Collective Quantization by Particle Conjugation Constraints
We formulate the particle conjugation operation and its convenient
realization as --parity in the framework of several chiral soliton models.
The Skyrme model, the Skyrme model with vector mesons and the chiral quark
model are specifically treated. The vector and axial vector currents are
classified according to their behavior under --parity. In the soliton sector
particle conjugation constrains {\it a priori} ambiguous orderings of operators
in the space of the collective coordinates. In the Skyrme model with vector
mesons and in a local chiral model with an explicit valence quark this
classification scheme provides consistency conditions for the ordering of the
collective operators appearing in the corrections to the nucleon axial
charge and the isovector magnetic moment. These consistency conditions cause
the corrections obtained from an ordinary perturbation expansion to vanish in
the context of the collective quantization of the static soliton configuration.
This conclusion presumably applies to all local effective chiral models.Comment: 20 pages LaTeX, Conclusions made more precise, some recent references
adde
Recommended from our members
Heavy quark symmetries and the decays baryon antibaryon
We enumerate the form factors necessary to describe the two-body baryonic decays of B mesons.We use the symmetries of the heavy quark effective theory to arrive at some relations among these form factors, when at least one of the daughter baryons is heavy
Baryons in the heavy quark effective theory
SIGLETIB: RA 2999(90-101) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman
Polarization effects in heavy #LAMBDA# decays
SIGLETIB: RA 2999(90-162) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman