1,374 research outputs found
Recent results from the search for the critical point of strongly interacting matter at the CERN SPS
Recent searches at the CERN SPS for evidence of the critical point of
strongly interacting matter are discussed. Experimental results on
theoretically expected signatures, such as event-to-event fluctuations of the
particle multiplicity and the average transverse momentum as well as
intermittency in particle production are presented.Comment: XXXIV Physics in Collision Symposiu
Anisotropic Flow of Strange Particles at SPS
The elliptic flow for Lambda hyperons and K0s mesons was measured by the NA49
experiment in semicentral Pb+Pb collisions at 158A GeV. The standard method of
correlating particles with an event plane has been used. Measurements of v2
near mid-rapidity are reported as a function of centrality, rapidity and
transverse momentum. Elliptic flow of Lambda and K0s particles increases both
with the impact parameter and with the transverse momentum. It is compared with
v2 for pions and protons as well as with various model predictions. The NA49
results are compared with data from NA45/CERES and STAR experiments
Third Family Quark-Lepton Unification at the TeV Scale
We construct a model of quark-lepton unification at the TeV scale based on an
gauge symmetry, while still having acceptable neutrino masses and
enough suppression in flavor changing neutral currents. An approximate
flavor symmetry is an artifact of family-dependent gauge charges leading to a
natural realization of the CKM mixing matrix. The model predicts sizeable
violation of PMNS unitarity as well as a gauge vector leptoquark which can be produced at the LHC -- both effects
within the reach of future measurements. In addition, recently reported
experimental anomalies in semi-leptonic -meson decays, both in charged and neutral currents, can be accommodated.Comment: 9 pages, 5 tables. Version accepted for publication in PL
Ricci Reheating
We present a model for viable gravitational reheating involving a scalar
field directly coupled to the Ricci curvature scalar. Crucial to the model is a
period of kination after inflation, which causes the Ricci scalar to change
sign thus inducing a tachyonic effective mass for the
scalar field. The resulting tachyonic growth of the scalar field provides the
energy for reheating, allowing for temperatures high enough for thermal
leptogenesis. Additionally, the required period of kination necessarily leads
to a blue-tilted primordial gravitational wave spectrum with the potential to
be detected by future experiments. We find that for reheating temperatures
GeV, the possibility exists for the Higgs field to play
the role of the scalar field.Comment: 9 pages, 6 figure
- …