757 research outputs found
The Higgs as a Supersymmetric Partner, with a New Interpretation of Yukawa Couplings
An unconventional version of supersymmetry leads to the following highly
testable predictions: (1) The Higgs boson has an R-parity of -1, so it can only
be produced as one member of a pair of superpartners. (2) The only
superpartners are scalar bosons, so neutralinos etc. do not exist. (3) The most
likely candidate for cold dark matter is therefore a sneutrino. (4) The Higgs
and other bosonic superpartners have an unconventional equation of motion.
These predictions are associated with new interpretations of Yukawa couplings,
supersymmetry, gauge fields, and Lorentz invariance.Comment: 4 pages, proceedings of DPF2000 Meeting of APS Division of Particles
and Fields (August, 2000, Ohio State University
Looking into particle production at the Large Hadron Collider
Lightly triggered events may yield surprises about the nature of “soft” particle production at LHC energies. I suggest that event displays in coordinates matched to the dynamics of particle production (rapidity and transverse
momentum) may help sharpen intuition, identify interesting classes of events, and test expectations about the underlying event that accompanies hard-scattering phenomena
The coupling constants for an electroweak model with a unification symmetry
We introduce the sequence of spontaneous symmetry breaking of a coupling
between Pati-Salam and electroweak symmetries
in order to establish a mathematically consistent relation among the coupling
constants at grand unification energy scale. With the values of baryon minus
lepton quantum numbers of known quarks and leptons, by including right-handed
neutrinos, we can find the mixing angle relations at different energy levels up
to the electromagnetic scale.Comment: 8 page
Gauge invariance and non-constant gauge couplings
It is shown that space-time dependent gauge couplings do not completely break
gauge invariance. We demonstrate this in various gauge theories.Comment: 18 page
Unusual High-Energy Phenomenology of Lorentz-Invariant Noncommutative Field Theories
It has been suggested that one may construct a Lorentz-invariant
noncommutative field theory by extending the coordinate algebra to additional,
fictitious coordinates that transform nontrivially under the Lorentz group.
Integration over these coordinates in the action produces a four-dimensional
effective theory with Lorentz invariance intact. Previous applications of this
approach, in particular to a specific construction of noncommutative QED, have
been studied only in a low-momentum approximation. Here we discuss
Lorentz-invariant field theories in which the relevant physics can be studied
without requiring an expansion in the inverse scale of noncommutativity.
Qualitatively, we find that tree-level scattering cross sections are
dramatically suppressed as the center-of-mass energy exceeds the scale of
noncommutativity, that cross sections that are isotropic in the commutative
limit can develop a pronounced angular dependence, and that nonrelativistic
potentials (for example, the Coloumb potential) become nonsingular at the
origin. We consider a number of processes in noncommutative QED that may be
studied at a future linear collider. We also give an example of scattering via
a four-fermion operator in which the noncommutative modifications of the
interaction can unitarize the tree-level amplitude, without requiring any other
new physics in the ultraviolet.Comment: 24 pages LaTeX, 4 eps figures (v2: reference added, v3: minor
clarifications
The Good Night Out Campaign: evaluation of a nightlife worker training programme to prevent sexual violence in Liverpool
In 2019, Good Night Out Campaign (GNOC) facilitators (from Liverpool Local Authority and RASA Merseyside) worked with 11 nightlife venues to engage them in the GNOC, providing guidance on preventing and responding to sexual violence, training for over 150 nightlife workers, and materials to display in venues to raise awareness of the GNOC and encourage nightlife patrons to report incidents. This report provides a summary of findings from an evaluation of the GNOC training. Findings suggest that the GNOC training programme is associated with: improvements in knowledge; improved attitudes towards sexual violence; and, greater readiness and confidence to intervene in sexual violence, amongst nightlife workers
Prospects for the Bc Studies at LHCb
We discuss the motivations and perspectives for the studies of the mesons of
the (bc) family at LHCb. The description of production and decays at LHC
energies is given in details. The event yields, detection efficiencies, and
background conditions for several Bc decay modes at LHCb are estimated.Comment: 20 pages, 5 eps-figure
Quarkonium Wave Functions at the Origin
We tabulate values of the radial Schr\"{o}dinger wave function or its first
nonvanishing derivative at zero quark-antiquark separation, for ,
, and levels that lie below, or just above, flavor
threshold. These quantities are essential inputs for evaluating production
cross sections for quarkonium states.Comment: 9 pages, RevTeX, no figure
Recommended from our members
What lies ahead
Open questions pertaining to the weak interactions are summarized, and the case for exploration of the 1 TeV scale is reviewed. The physics prospects for a multi-TeV hadron collider are briefly surveyed. 24 references
Scalar radius of the pion in the Kroll-Lee-Zumino renormalizable theory
The Kroll-Lee-Zumino renormalizable Abelian quantum field theory of pions and
a massive rho-meson is used to calculate the scalar radius of the pion at next
to leading (one loop) order in perturbation theory. Due to renormalizability,
this determination involves no free parameters. The result is . This value gives for , the low energy constant of
chiral perturbation theory, , and , where F
is the pion decay constant in the chiral limit. Given the level of accuracy in
the masses and the coupling, the only sizable uncertainty in this
result is due to the (uncalculated) NNLO contribution
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