18,374 research outputs found
Novel Creep-resistant Ferritic Alloy Designed by the Concept of Precipitation Hardening with Two Types of Precipitates
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Search for the signal of monotop production at the early LHC
We investigate the potential of the early LHC to discover the signal of
monotops, which can be decay products of some resonances in models such as
R-parity violating SUSY or SU(5), etc. We show how to constrain the parameter
space of the models by the present data of boson hadronic decay branching
ratio, mixing and dijet productions at the LHC. Then, we study
the various cuts imposed on the events, reconstructed from the hadronic final
states, to suppress backgrounds and increase the significance in detail. And we
find that in the hadronic mode the information from the missing transverse
energy and reconstructed resonance mass distributions can be used to specify
the masses of the resonance and the missing particle. Finally, we study the
sensitivities to the parameters at the LHC with =7 TeV and an
integrated luminosity of in detail. Our results show that the
early LHC may detect this signal at 5 level for some regions of the
parameter space allowed by the current data.Comment: 25 pages, 18 figures, 3 tables, version published in Phys.Rev.
Searching for double-peak and doubly broken gravitational-wave spectra from Advanced LIGO-Virgo's first three observing runs
The current LIGO-Virgo observing run has been pushing the sensitivity limit
to touch the stochastic gravitational-wave backgrounds (SGWBs). However, no
significant detection has been reported to date for any single dominated source
of SGWBs with a single broken-power-law (BPL) spectrum. Nevertheless, it could
equally well escape from existing Bayesian searches from, for example, two
comparable dominated sources with two separate BPL spectra (double-peak case)
or a single source with its power-law behavior in the spectrum broken twice
(doubly broken case). In this paper, we put constraints on these two cases but
specifically for the model with cosmological first-order phase transitions from
Advanced LIGO-Virgo's first three observing runs. We found strong negative
evidence for the double-peak case and hence place 95\% C.L. upper limits
and
on the two BPL spectra amplitudes with
respect to the unresolved compact binary coalescence (CBC) amplitude
. We further found weak negative evidence
for the doubly broken case and hence place 95\% C.L. upper limit
on the overall amplitude of the doubly
broken spectrum with respect to . In
particular, the results from the double-peak case have marginally ruled out the
strong super-cooling first-order phase transitions at LIGO-Virgo band.Comment: v1, 5 pages + references, 5 figures, 1 table; v2, 11 pages, 6
figures, 1 table, version accepted for publication in Physical Review D; v3,
to match the published versio
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