15,393 research outputs found
Probing the Top-Higgs Yukawa CP Structure in dileptonic with -Assisted Reconstruction
Constraining the Higgs boson properties is a cornerstone of the LHC program.
We study the potential to directly probe the Higgs-top CP-structure via the
channel at the LHC with the Higgs boson decaying to a bottom pair
and top-quarks in the dileptonic mode. We show that a combination of laboratory
and rest frame observables display large CP-sensitivity, exploring
the spin correlations in the top decays. To efficiently reconstruct our final
state, we present a method based on simple mass minimization and prove its
robustness to shower, hadronization and detector effects. In addition, the mass
reconstruction works as an extra relevant handle for background suppression.
Based on our results, we demonstrate that the Higgs-top CP-phase can
be probed up to at the high luminosity LHC.Comment: 25 pages, 11 figures, 3 table
The motivation and status of two-body resonance decays after the LHC Run 2 and beyond
Searching for two-body resonance decays is a central component of the high
energy physics energy frontier research program. While many of the
possibilities are covered when the two bodies are Standard Model (SM)
particles, there are still significant gaps. If one or both of the bodies are
themselves non-SM particles, there is very little coverage from existing
searches. We review the status of two-body searches and motivate the need to
search for the missing combinations. It is likely that the search program of
the future will be able to cover all possibilities with a combination of
dedicated and model agnostic search approaches.Comment: 17 pages, 1 figure, 14 table
Probing TeV scale Top-Philic Resonances with Boosted Top-Tagging at the High Luminosity LHC
We investigate the discovery potential of singly produced top-philic
resonances at the high luminosity (HL) LHC in the four-top final state. Our
analysis spans over the fully-hadronic, semi-leptonic, and same-sign dilepton
channels where we present concrete search strategies adequate to a boosted
kinematic regime and high jet-multiplicity environments. We utilize the
Template Overlap Method (TOM) with newly developed template observables for
tagging boosted top quarks, a large-radius jet variable and customized
b-tagging tactics for background discrimination. Our results show that the
same-sign dilepton channel gives the best sensitivity among the considered
channels, with an improvement of significance up to 10%-20% when combined with
boosted-top tagging. Both the fully-hadronic and semi-leptonic channels yield
comparable discovery potential and contribute to further enhancements in the
sensitivity by combining all channels. Finally, we show the sensitivity of a
top-philic resonance at the LHC and HL-LHC by showing the exclusion
limit and discovery reach, including a combination of all three
channels.Comment: 19 pages, 14 figure
Shedding Light on Top Partner at the LHC
We investigate the sensitivity of the 14 TeV LHC to pair-produced top
partners () decaying into the Standard Model top quark () plus either a
gluon () or a photon (). The decays and
can be dominant when the mixing between the top partner
and top quark are negligible. In this case, the conventional decays
, , and are highly
suppressed and can be neglected. We take a model-independent approach using
effective operators for the -- and -- interactions,
considering both spin- and spin- top partners. We
perform a semi-realistic simulation with boosted top quark tagging and an
appropriate implementation of a jet-faking-photon rate. Despite a simple
dimensional analysis indicating that the branching ratios due to the
electric-magnetic coupling being much smaller than the strong force coupling,
our study shows that the LHC sensitivity to is more significant than the sensitivity to
. This is due to much smaller
backgrounds attributed to the isolated high- photon. We find that with
these decay channels and 3 ab of data, the LHC is sensitive to top
partner masses ~TeV for spin- and
spin- top partners, respectively.Comment: 33 pages, 10 figures, 7 table
Estimate black hole masses of AGNs using ultraviolet emission line properties
Based on the measured sizes of broad line region of the reverberation-mapping
AGN sample, two new empirical relations are introduced to estimate the central
black hole masses of radio-loud high-redshift () AGNs. First, using
the archival spectroscopy data at UV band for the
reverberation-mapping objects, we obtained two new empirical relations between
the BLR size and \Mg/\C emission line luminosity. Secondly, using the newly
determined black hole masses of the reverberation-mapping sample for
calibration, two new relationships for determination of black hole mass with
the full width of half maximum and the luminosity of \Mg/\C line are also
found. We then apply the relations to estimate the black hole masses of AGNs in
Large Bright Quasar Surveyq and a sample of radio-loud quasars. For the objects
with small radio-loudness, the black hole mass estimated using the R_{\rm BLR}
- L_{\eMg/\eC} relation is consistent with that from the relation. But for radio-loud AGNs, the mass estimated
from the R_{BLR} - L_{\eMg/\eC} relation is systematically lower than that
from the continuum luminosity . Because jets could have
significant contributions to the UV/optical continuum luminosity of radio-loud
AGNs, we emphasized again that for radio-loud AGNs, the emission line
luminosity may be a better tracer of the ionizing luminosity than the continuum
luminosity, so that the relations between the BLR size and UV emission line
luminosity should be used to estimate the black hole masses of high redshift
radio-loud AGNs.Comment: 19 pages, 10 figure
Domain-mediated interactions for protein subfamily identification
Within a protein family, proteins with the same domain often exhibit different cellular functions, despite the shared evolutionary history and molecular function of the domain. We hypothesized that domain-mediated interactions (DMIs) may categorize a protein family into subfamilies because the diversified functions of a single domain often depend on interacting partners of domains. Here we systematically identified DMI subfamilies, in which proteins share domains with DMI partners, as well as with various functional and physical interaction networks in individual species. In humans, DMI subfamily members are associated with similar diseases, including cancers, and are frequently co-associated with the same diseases. DMI information relates to the functional and evolutionary subdivisions of human kinases. In yeast, DMI subfamilies contain proteins with similar phenotypic outcomes from specific chemical treatments. Therefore, the systematic investigation here provides insights into the diverse functions of subfamilies derived from a protein family with a link-centric approach and suggests a useful resource for annotating the functions and phenotypic outcomes of proteins.11Ysciescopu
Resolving Combinatorial Ambiguities in Dilepton Event Topologies with Constrained Variables
We advocate the use of on-shell constrained variables in order to
mitigate the combinatorial problem in SUSY-like events with two invisible
particles at the LHC. We show that in comparison to other approaches in the
literature, the constrained variables provide superior ansatze for the
unmeasured invisible momenta and therefore can be usefully applied to
discriminate combinatorial ambiguities. We illustrate our procedure with the
example of dilepton events. We critically review the existing
methods based on the Cambridge variable and MAOS-reconstruction of
invisible momenta, and show that their algorithm can be simplified without loss
of sensitivity, due to a perfect correlation between events with complex
solutions for the invisible momenta and events exhibiting a kinematic endpoint
violation. Then we demonstrate that the efficiency for selecting the correct
partition is further improved by utilizing the variables instead.
Finally, we also consider the general case when the underlying mass spectrum is
unknown, and no kinematic endpoint information is available
Discovering Organizational Correlations from Twitter
Organizational relationships are usually very complex in real life. It is
difficult or impossible to directly measure such correlations among different
organizations, because important information is usually not publicly available
(e.g., the correlations of terrorist organizations). Nowadays, an increasing
amount of organizational information can be posted online by individuals and
spread instantly through Twitter. Such information can be crucial for detecting
organizational correlations. In this paper, we study the problem of discovering
correlations among organizations from Twitter. Mining organizational
correlations is a very challenging task due to the following reasons: a) Data
in Twitter occurs as large volumes of mixed information. The most relevant
information about organizations is often buried. Thus, the organizational
correlations can be scattered in multiple places, represented by different
forms; b) Making use of information from Twitter collectively and judiciously
is difficult because of the multiple representations of organizational
correlations that are extracted. In order to address these issues, we propose
multi-CG (multiple Correlation Graphs based model), an unsupervised framework
that can learn a consensus of correlations among organizations based on
multiple representations extracted from Twitter, which is more accurate and
robust than correlations based on a single representation. Empirical study
shows that the consensus graph extracted from Twitter can capture the
organizational correlations effectively.Comment: 11 pages, 4 figure
- …