ep - p h / 98 08 42 9 v 3 2 2 Ja n 19 99 RAL - TR - 1998 - 037 DTP / 98 / 32 Cavendish - HEP - 97
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چکیده
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RAL - TR - 1998 - 037 DTP / 98 / 32 Cavendish - HEP - 97 / 12 August 1998 Revised December 1998 Spin correlations in e + e − → 4 jets 1
Existence of discrepancies between experimental data and Monte Carlo predictions for angular distributions in four-jet production via ee annihilation has been known for some time at LEP1. As such QCD processes constitute significant backgrounds to ee → WW → 4-jet production at LEP2, we consider the possibility that an erroneous modelling of the helicity structure of the finalstate partons could...
متن کاملar X iv : h ep - p h / 98 08 47 2 v 1 2 9 A ug 1 99 8 UH - 511 - 913 - 98 August 1998 CP VIOLATION IN HYPERON DECAYS
The theory and phenomenology of CP violation in hyperon decays is summarized.
متن کاملar X iv : h ep - p h / 98 01 34 9 v 3 1 2 Ju n 19 98 hep - ph / 9801349 Alberta Thy - 02 - 98 January , 1998 revised
CP-violating signals in weak Ξ → πΛ decay require the knowledge of πΛ Sand P-wave scattering phases at m Ξ center-of-mass energy. We have calculated these phases in baryon chiral perturbation theory with the ground-state Σ in s and u channels and 3 2 + Σ(1385) in the u channel. We do not treat the baryons as heavy. We find δ S = 1.2 • and δ P = −1.7 • with the central value of the strong coupli...
متن کاملar X iv : h ep - p h / 97 08 47 8 v 1 2 7 A ug 1 99 7 RAL - 97 - 042 hep - ph / 9708478 Two photon physics at LEP 2
The working group on two photon physics concentrated on three main subtopics: modelling the hadronic final state of deep inelastic scattering on a photon; unfolding the deep inelastic scattering data to obtain the photon structure function; and resonant production of exclusive final states, particularly of glueball candidates. In all three areas, new results were presented.
متن کاملar X iv : h ep - p h / 98 08 48 8 v 1 3 1 A ug 1 99 8 UFIFT - HEP - 98 - 19 The case for a Standard Model with Anomalous
A gauged phase symmetry with its anomalies cancelled by a Green-Schwarz mechanism, broken at a large scale by an induced Fayet-Iliopoulos term, is a generic feature of a large class of superstring theories. It induces many desirable phenomenological features: Yukawa coupling hierarchy, the emergence of a small Cabibbo-like expansion parameter, relating the Weinberg angle to b − τ unification, a...
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تاریخ انتشار 1998