Global Power Counting Analysis On Probing Electroweak Symmetry Breaking Mechanism At High Energy Colliders

We develop a precise power counting rule (a generalization of Weinberg's counting method for the nonlinear sigma model) for the electroweak theories formulated by chiral Lagrangians. Then we estimate the contributions of ``all'' next-to-leading order (NLO) bosonic operators to the amplitudes of the relevant scattering processes which can be measured at high energy colliders, such as the LHC and future Linear Colliders. Based upon these results, we globally classify the sensitivities of testing all NLO bosonic operators for probing the electroweak symmetry breaking mechanism at high energy colliders.Comment: Version Published in Physics Letters B. Latex, 12 pages, minor typos correcte

Rigorous bounds on survival times in circular accelerators and efficient computation of fringe-field transfer maps

Analyzing stability of particle motion in storage rings contributes to the general field of stability analysis in weakly nonlinear motion. A method which we call pseudo invariant estimation (PIE) is used to compute lower bounds on the survival time in circular accelerators. The pseudeo invariants needed for this approach are computed via nonlinear perturbative normal form theory and the required global maxima of the highly complicated multivariate functions could only be rigorously bound with an extension of interval arithmetic. The bounds on the survival times are large enough to the relevant; the same is true for the lower bounds on dynamical aperatures, which can be computed. The PIE method can lead to novel design criteria with the objective of maximizing the survival time. A major effort in the direction of rigourous predictions only makes sense if accurate models of accelerators are available. Fringe fields often have a significant influence on optical properties, but the computation of fringe-field maps by DA based integration is slower by several orders of magnitude than DA evaluation of the propagator for main-field maps. A novel computation of fringe-field effects called symplectic scaling (SYSCA) is introduced. It exploits the advantages of Lie transformations, generating functions, and scaling properties and is extremely accurate. The computation of fringe-field maps is typically made nearly two orders of magnitude faster. (orig.)Available from TIB Hannover: RA 2999(94-242) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Quartic gauge boson couplings at linear colliders Interplay of WWZ/ZZZ production and WW-fusion

We study new physics effects to the quartic gauge boson couplings formulated by the electroweak chiral Lagrangian. Five next-to-leading order operators characterize the anomalous quartic gauge interactions which involve pure Goldstone boson dynamics for the electroweak symmetry breaking. We estimate the typical size of these couplings in different strongly-interacting models and examine the sensitivity to directly probing them via the WWZ/ZZZ triple gauge boson production at the high energy linear colliders. The important roles of polarized e"- and e"+ beams are stressed. We then compare the results with those from the W-pair production of the WW-fusion processes, and analyze the interplay of these two production mechanisms for an improved probe of the quartic gauge boson interactions. (orig.)Available from TIB Hannover: RA 2999(97-140) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Quartic gauge interactions at NLC - interplay of WWZ/ZZZ production and WW-fusion -

The new physics effects of the strong electroweak symmetry breaking (EWSB) can be parametrized by a complete set of the chiral Lagrangian parameters. Five of them characterize the anomalous quartic gauge interactions which involve pure Goldstone dynamics for the EWSB but are least constrained from the current data. After analyzing the different patterns of these parameters in connection with typical underlying resonance/non-resonance models, we perform model-independent systematic study on bounding them via WWZ/ZZZ-production and WW-fusion at the next generation high energy e"#+-#e"- linear colliders (NLC). The main focus is put onto the interplay of these two production mechanisms for achieving a complete probe of the quartic gauge interactions in a multi-parameter analysis. The important roles of both polarized e"- and e"+ beams are revealed. (orig.)Available from TIB Hannover: RA 2999(97-140) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Quark/gluon jet discrimination at HERA

SIGLEAvailable from TIB Hannover: RA 2999(92-103) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Analysis of elastic scattering at low momentum transfer

SIGLEAvailable from TIB Hannover: RA 2999(91-143) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Tests of goodness of fit to multiple data sets

We propose a new and rather stringent criterion for testing the goodness of fit between a theory and experiment. It is motivated by the paradox that the criterion on #chi#"2 for testing a theory is much weaker than the criterion for finding the best fit value of a parameter in the theory. We present a method by which the stronger parameter-fitting criterion can be applied to subsets of data in a global fit. (orig.)Available from TIB Hannover: RA 2999(01-014) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Collective motion in Ar+Pb collisions at beam energies between 400 and 1800 MeV/nucleon

SIGLEAvailable from TIB Hannover: RO 801(91-26) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Probing electroweak symmetry braking mechanism at the LHC: A guideline from power counting analysis

We formulate the equivalence theorem as a criterion for sensitively probing the electroweak symmetry breaking mechanism, and develop a precise power counting rule for chiral Lagrangian formulated electroweak theories (CLEWT). With these we give a systematic analysis on the sensitivities of the scattering processes W"#+-#W"#+-##->#W"#+-#W"#+-# and q anti q'#->#W"#+-#Z to probing all possible effective bosonic operators in the CLEWT at the CERN Large Hadron Collider (LHC). (orig.)16 refs.SIGLEAvailable from TIB Hannover: RN 437(96-029) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

Estimating the sensitivity of LHC to electroweak symmetry breaking: Longitudinal/Goldstone boson equivalence as a criterion

Based upon our recent study (Phys. Rev. D, vol.51, p.6463, 1995), we reveal the profound physical content of the longitudinal/Goldstone boson equivalence theorem as being able to discriminate physical processes which are sensitive/insensitive to probing the electroweak symmetry breaking (EWSB) sector. We then develop a precise electroweak power counting rule (a generalization from Weinberg's counting method) to separately count the power dependences on the energy E and all relevant mass scales. With these, we analyze the complete set of the bosonic operators in the electroweak chiral Lagrangian and systematically estimate and classify the sensitivities for testing all these effective operators at the CERN LHC via the weak-boson fusions and quark-anti-quark annihilations. These two kinds of processes are shown to be complementary in probing the EWSB mechanism. (orig.)SIGLEAvailable from TIB Hannover: RA 2999(96-148) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman