329 research outputs found
Rise of Kp Total Cross Section and Universality
The increase of the measured hadronic total cross sections at the highest
energies is empirically described by squared log of center-of-mass energy sqrt
s as sigma(tot)= B (log s)2, consistent with the energy dependence of the
Froissart unitarity bound. The coefficient B is argued to have a universal
value, but this is not proved directly from QCD. In the previous tests of this
universality, the p(pbar)p, pi p, and K p forward scatterings were analyzed
independently and found to be consistent with B(pp) = B(pip) = B(Kp), although
the determined value of B(Kp) had large uncertainty. In the present work, we
have further analyzed forward Kp scattering to obtain a more exact value of
B(Kp). Making use of continuous moment sum rules(CMSR) we have fully exploited
the information of low-energy scattering data to predict the high-energy
behavior of the amplitude hrough duality. The estimation of B(Kp) is improved
remarkably, and our result strongly supports the universality of B.Comment: 12 pages, 3 figure
Four-Lepton Resonance at the Large Hadron Collider
A spin-1 weakly interacting vector boson, Z', is predicted by many new
physics theories. Searches at colliders for such a Z' resonance typically focus
on lepton-antilepton or top-antitop events. Here we present a novel channel
with a Z' resonance that decays to 4 leptons, but not to 2 leptons, and discuss
its possible discovery at the Large Hadron Collider. This baryonic gauge boson
is well motivated in a supersymmetry framework.Comment: Version to appear in PR
Superheavy Particle Origin of IceCube PeV Neutrino Events
We interpret the PeV shower events observed by the IceCube collaboration as
an s-channel enhancement of neutrino-quark scattering by a leptoquark that
couples to the tau-flavor and light quarks. With a leptoquark mass of ~ 0.6 TeV
and a steep 1/E^{2.3} neutrino flux, charged-current scattering gives shower
events at ~ 1 PeV and neutral-current scattering gives shower events at ~ 0.5
PeV. This mechanism is also consistent with the paucity of muon-track events
above 100 TeV.Comment: 10 pages, 4 figures. The version appears in Phys. Lett. B, October
201
Searching for Stoponium along with the Higgs boson
Stoponium, a bound state of top squark and its antiparticle in a
supersymmetric model, may be found in the ongoing Higgs searches at the LHC.
Its WW and ZZ detection ratios relative to the Standard Model Higgs boson can
be more than unity from WW* threshold to the two Higgs threshold. The gamma
gamma channel is equally promising. Some regions of the stoponium mass below
150 GeV are already being probed by the ATLAS and CMS experiments.Comment: 10 pages 5 figure
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