140 research outputs found
Signatures of an invisibly decaying Higgs particles at LHC
The Higgs particle can decay dominantly into an invisible channel in the
Majoron models. We have explored the prospect of detecting such a Higgs
particle at LHC via its associated production with a gluon, Z or W boson. While
the signal/background ratio is too small for the first process, the latter two
provide viable signatures for detecting such a Higgs particle.Comment: (e-mail: [email protected]) LaTex; No. of pages 12, no. of
figures 3 (available on request
Resolving Octant Degeneracy at LBL experiment by combining Daya Bay Reactor Setup
Long baseline Experiment (LBL) have promised to be a very powerful
experimental set up to study various issues related to Neutrinos. Some ongoing
and planned LBL and medium baseline experiments are - T2K, MINOS, NOvA, LBNE,
LBNO etc. But the long baseline experiments are crippled due to presence of
some parameter degeneracies, like the Octant degeneracy. In this work, we first
show the presence of Octant degeneracy in LBL experiments, and then combine it
with Daya Bay Reactor experiment, at different values of CP violation phase. We
show that the Octant degeneracy in LBNE can be resolved completely with this
proposal.Comment: 4 pages, 8 figure
Bayesian Model of Behaviour in Economic Games
Classical game theoretic approaches that make strong rationality assumptions have difficulty modeling human behaviour in economic games. We investigate the role
of finite levels of iterated reasoning and non-selfish utility functions in a Partially Observable Markov Decision Process model that incorporates game theoretic notions
of interactivity. Our generative model captures a broad class of characteristic behaviours in a multi-round Investor-Trustee game. We invert the generative process
for a recognition model that is used to classify 200 subjects playing this game against randomly matched opponents
Effect of heating rates on the synthesis of Al2O3–SiC composites by the self-propagating high-temperature synthesis (SHS) technique
Various aspects of insitu formation of Al2O3–SiC composites by the self-propagating high-temperature synthesis (SHS) technique have been investigated using thermal analyses (TG/DTA) of a powder mixture (4Al, 3SiO2, 3C) and pellets in an argon atmosphere at different heating rates. Both the reaction initiation and peak temperatures are found to increase with the heating rates. At lower heating rates, the powder samples do not reveal any exothermic peak possibly because of poor reactivity and sluggish exothermic reaction. The appearance of exothermic peaks in the DTA plots after melting of aluminum indicates reduction of silica by liquid aluminum. Conversion of aluminum is found to decrease marginally with an increase in heating rates. The apparent activation energy of the process compares well with the interdiffusion activation energy of silicon and oxygen, indicating that oxygen diffusion in Si formed at the reaction front may be the rate-controlling factor for this SHS process. From SEM studies it appears that the formation of SiC whiskers is through liquid-phase mass transfer
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ROMOP: a light-weight R package for interfacing with OMOP-formatted electronic health record data.
Objectives:Electronic health record (EHR) data are increasingly used for biomedical discoveries. The nature of the data, however, requires expertise in both data science and EHR structure. The Observational Medical Out-comes Partnership (OMOP) common data model (CDM) standardizes the language and structure of EHR data to promote interoperability of EHR data for research. While the OMOP CDM is valuable and more attuned to research purposes, it still requires extensive domain knowledge to utilize effectively, potentially limiting more widespread adoption of EHR data for research and quality improvement. Materials and methods:We have created ROMOP: an R package for direct interfacing with EHR data in the OMOP CDM format. Results:ROMOP streamlines typical EHR-related data processes. Its functions include exploration of data types, extraction and summarization of patient clinical and demographic data, and patient searches using any CDM vocabulary concept. Conclusion:ROMOP is freely available under the Massachusetts Institute of Technology (MIT) license and can be obtained from GitHub (http://github.com/BenGlicksberg/ROMOP). We detail instructions for setup and use in the Supplementary Materials. Additionally, we provide a public sandbox server containing synthesized clinical data for users to explore OMOP data and ROMOP (http://romop.ucsf.edu)
NLO Corrections to lepton pair production beyond the Standard Model at hadron colliders
We consider lepton pair production at a hadron collider in a class of
effective theories with the relevant operators being four-fermion contact
interaction. Despite the nonrenormalizable nature of the interaction, we
explicitly demonstrate that calculating QCD corrections is both possible and
meaningful. Calculating the corrections for various differential distributions,
we show that these can be substantial and significantly different from those
within the SM. Furthermore, the corrections have a very distinctive flavour
dependence. And finally, the scale dependence of the cross sections are greatly
reduced once the NLO corrections are taken into account.Comment: 23 pages, 14 figures, few typos corrected, written in JHEP styl
Large evolution of the bilinear Higgs coupling parameter in SUSY models and reduction of phase sensitivity
The phases in a generic low-energy supersymmetric model are severely
constrained by the experimental upper bounds on the electric dipole moments of
the electron and the neutron. Coupled with the requirement of radiative
electroweak symmetry breaking, this results in a large degree of fine tuning of
the phase parameters at the unification scale. In supergravity type models,
this corresponds to very highly tuned values for the phases of the bilinear
Higgs coupling parameter and the universal trilinear coupling . We
identify a cancellation/enhancement mechanism associated with the
renormalization group evolution of , which, in turn, reduces such
fine-tuning quite appreciably without taking recourse to very large masses for
the supersymmetric partners. We find a significant amount of reduction of this
fine-tuning in nonuniversal gaugino mass models that do not introduce any new
phases.Comment: Version to appear in Phys.Rev.D. Insignificant changes like a few
typos corrected. 26 pages, 7 figures, LaTe
Brane Dynamics in the Randall-Sundrum model, Inflation and Graceful Exit
We study the averaged action of the Randall-Sundrum model with a time
dependent metric ansatz. It can be reformulated in terms of a Brans-Dicke
action with time dependent Newton's constant. We show that the physics of early
universe, particularly inflation, is governed by the Brans-Dicke theory. The
Brans-Dicke scalar, however, quickly settles to its equilibrium value and
decouples from the post-inflationary cosmology. The deceleration parameter is
negative to start with but changes sign before the Brans-Dicke scalar settles
to its equilibrium value. Consequently, the brane metric smoothly exits
inflation. We have also studied the slow-roll inflation in our model and
investigated the spectra of the density perturbation generated by the radion
field and find them consistent with the current observations.Comment: Revised version, Accepted in Class. Quant. Gravit
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