22,077 research outputs found
On the consistency of tachyon warm inflation with viscous pressure
We obtain conditions for the existence of an attractor in the system of
equations describing a tachyon warm inflationary model with bulk viscosity
taken into account. When these conditions are met the evolution approaches
slow-roll regime. We present the primordial power spectrum for the tachyon
field by considering a dissipation coefficient depending on the scalar field
and temperature.Comment: 12 page
Multiplicity of the saturated special fiber ring of height two perfect ideals
Let be a polynomial ring and be a perfect ideal of height
two minimally generated by forms of the same degree. We provide a formula for
the multiplicity of the saturated special fiber ring of . Interestingly,
this formula is equal to an elementary symmetric polynomial in terms of the
degrees of the syzygies of . Applying ideas introduced in arXiv:1805.05180,
we obtain the value of the j-multiplicity of and an effective method for
determining the degree and birationality of rational maps defined by
homogeneous generators of .Comment: to appear in Proc. Amer. Math. So
Searches for Majorana Neutrinos and Direct Searches for Exotics at LHCb
These proceedings present the LHCb results on Majorana neutrino searches and
direct production of exotic particles using the data collected during Run I of
LHC. For the former, Majorana neutrinos are searched for both on-shell and
off-shell in and decays to final states with two same-sign muons. For
the latter, different types of new particles are studied profiting the unique
coverage of LHCb with respect to other detectors.Comment: 9 pages, 27 figures. To be published in the LISHEP 2015 proceeding
Muon Identification in the LHCb experiment
A short summary of the LHCb muon identification procedure is given in this
article. First, the muon system of LHCb is presented, together with some
examples of physics measurements of the experiment where the muon
identification is crucial. Then, the muon identification algorithm is
introduced in three single steps. With this, the efficiency vs.
misidentification rate is shown for MC simulated data. The way this method will
be calibrated with real data is also seen. Finally, some preliminary muon
identification results with proton-proton collisions at sqrt(s) = 900 GeV are
presented.Comment: Proceedings for the Moriond 2010 E
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