31086876
Stringent low-energy mass constraints in no-scale supergravity.
Spectacular mass constraints are shown to exist at low energies in minimal no-scale supergravity theories. The top quark cannot be too light, the lowest-lying Higgs particle cannot be too heavy, and the pseudoscalar Higgs boson must weigh nearly a quarter as much as the gluino.
29048760
Supercollider signatures and correlations of heavy neutrinos.
Forthcoming proton supercolliders can discover a heavy neutrino lying hidden in the 10{sup 2}--10{sup 3} GeV mass range, one that may harbinger a new set of heavy particles. For an unstable neutrino, the optimal search strategy will be to study a final state of charged dileptons and jets without missing {ital p}{sub {ital T}}. Dilepton charge signs {ital or} angular correlations can discriminate between Dirac and Majorana heavy neutrinos.
22137804
Inclusive forward-backward asymmetry for light quarks.
The energy-differential forward-backward asymmetry in the reaction {ital e}{sup +}{ital e}{sup {minus}}{r arrow}M+ anything, {ital M} being a leading, light-quark-constituted meson in a jet, is considered. The measurement of this quantity yields rank-1 and higher-rank fragmentation functions for light quarks hadronizing into light mesons, separately. It is also possible, in the case of a large event sample and good particle identification capabilities at high energies, to obtain information on {ital Z} couplings to light quarks.
35841915
Constraints on baryon-nonconserving Yukawa couplings in a supersymmetric theory.
The 1-loop evolution of couplings in the minimal supersymmetric standard model, extended to include baryon nonconserving $(B\!\!\!/)$ operators through explicit $R$-parity violation, is considered keeping only $B\!\!\!/$ superpotential terms involving the maximum possible number of third generation superfields. If all retained Yukawa couplings $Y_i$ are required to remain in the perturbative domain $(Y_i<1)$ upto the scale of gauge group unification, upper bounds ensue on the magnitudes of the $B\!\!\!/$ coupling strengths at the supersymmetry breaking scale, independent of the model of unification. They turn out to be similar to the corresponding fixed point values reached from a wide range of $Y_i$ (including all $Y_i$ greater than unity) at the unification scale. The coupled evolution of the top and $B\!\!\!/$ Yukawa couplings results in a reduction of the fixed point value of the former.
27592689
Role of chiral scalar and pseudoscalar in two-photon production of a superlight gravitino.
The interesting possibility of observing a superlight gravitino in photon-photon collisions has been pointed out recently. A complete analysis is done of that problem taking into full account the contributions from superlight chiral scalar and pseudoscalar hidden-sector particles which couple gravitationally. The order of magnitude of the cross section is the same as that in the earlier work.
35680472
Identifying tau as a nonleptonic superparticle.
Given a lepton number L=1 for e, ν e , μ, and ν μ , all available data at present are compatible with L=0 for τ and ν τ . A model with such an assignment is shown to be as natural as the conventional one in a supersymmetric extension of the standard model. Processes such as pp (orpp)→τ ± τ ± + two quark jets as well as ep→ττ − + one quark jet+missing energy (p τ ) provide unique signatures of this possibility.
42855125
High-density behavior in supersymmetry.
We investigate the effect of a large fermion density on a supersymmetric interacting field theory.