18733530
Effects of a new heavy neutral vector boson at SLC and LEP
Models with an extra neutral gauge boson (Z') are discussed. We constrain the Z' mass as a function of its mixing angle with the known Z/sup 0/ by requiring that the Z/sup 0/ mass not be shifted excessively by this mixing, and from the Higgs vacuum expectation value structure of the mass matrix. We compare these limits with those previously found from neutral current experiments. We discuss possible effects of non-excluded models on e/sup +/e/sup -/ physics at SLC and LEP. 8 refs., 3 figs.
125325652
Fine structure of the P states in quarkonium and the spin dependent potential
122032304
epsilon-prime / epsilon: Review and recent progress
The evolution of the theoretical perspective on {epsilon}{prime}/{epsilon} is reviewed. The introduction of the Z{sup O} penguin and the effects of high M{sub t} are discussed, in particular the possibility for {epsilon}{prime}/{epsilon} to be identically zero. Recent calculations of {epsilon}{prime}/{epsilon} based on current estimates and bounds on the input parameters are presented. 41 refs., 13 figs.
118912831
Physics at DAPHNE
Proceedings of invited lecture at the Zuoz summer school on hadronic aspects of collider physics, August 23-31, 1994, Zuoz, Switzerland. Describes the PHI factory DAPHNE being built at Frascati, Italy, and the physics that can be done there, with emphasis on its potential for studying CP violation.
117191069
Higgs Search at LEP
120474408
Fine structure of the P states in heavy quarkonium and the nature of the spin-dependent potential
Abstract We discuss the failure of existing theories to agree with the experimental measurements of the fine structure of the χ states of the b b and c c systems. We rule out various possible explanations, such as mixing of the 2P triplet with the 1F triplet. We use thefact that the spin-independent potential is well-determined in the relevant range to extract accurate determinations of expectation values of the spin-dependent potentials providing tests for future theories. We find that the usual ansatz that the q q interaction has effective vector and scalar contributions only is very unlikely to be sufficient to explain the fine structure of the 3 P levels and to accomodate the recent measurement of the mass of the 1 P state in charmounium.
119472393
Physics at DAFNE2
The original plan of a vigorous program of frontier physics at LNF, based on the phi-factory DAFNE with the KLOE detector, has not yet reached its major aim in the study of discrete symmetries in the neutral kaon system. It has however led to the education of a new generation of particle and accelerator physicists. With such invaluable human resources it seems appropriate to consider a renewed effort in achieving much improved collider performance. It will be argued in the following that it is still possible to envision a program of superior quality physics, requiring several years and broad enough to justify a new collider operating at the phi-meson mass. It remains of paramount importance that the program covers topics of fundamental interest, with many collateral avenues well connected to the ultimate goal, a most sensitive test of CPT invariance. The appropriate time frame for these ventures to be successful is quite well defined, in view of the large LHC effort to begin towards the end of the present decade.
120932430
EXPERIMENTAL EVIDENCE CONCERNING CHARGE-CONJUGATION NONINVARIANCE IN THE DECAY OF THE /eta/ MESON
124883810
Strange B mesons
We have studied production of B* mesons at the ?(5S), detecting the quasimonochromatic photon from decay to the ground state. The observed signal is expected to be doppler broadened because of the motion of the B* d,u mesons from ?(5S) decays. The observed broadening is however considerably smaller than expected, and consistent with copious production of strange B mesons, B* s . Analysis of the data, for a large class of assumptions on the decay of ?(5S) to B*’s, leads to a lower limit of 30% for the fraction of strange mesons production.
118015691
Proposal to study inelastic high energy proton-proton collisions in the diffractive region
120709377
Measurement of B-meson semileptonic decay
Using the Columbia University-Stony Brook detector we have measured the production of energetic electrons (E>1 GeV) in e/sup +/e/sup -/ annihilations in the center-of-mass energy range 10.4 to 11.4 GeV. We observe an enhanced electron signal at the UPSILON'''(4S) resonance, which we interpret as evidence for the ..beta.. decay of a new flavor of quark, b, bound within a new flavor meson, B. We derive a branching ratio for B..-->..Xe..nu.. of (13.6 +- 2.5 +- 3)%. The observed energy spectrum of the electrons favors the decay b..-->..ce..nu.. over b..-->..uev.