758 research outputs found
750 GeV Composite Axion as the LHC Diphoton Resonance
We propose that the 750 GeV resonance, presumably observed in the early LHC
Run 2 data, could be a heavy composite axion that results from condensation of
a hypothetical quark in a high-colour representation of conventional QCD. The
model, motivated by a recently proposed solution to the strong CP problem, is
very economical and is essentially defined by the properties of the additional
quark - its colour charge, hypercharge and mass. The axion mass and its
coupling to two photons (via axial anomaly) can be computed in terms of these
parameters. The axion is predominantly produced via photon fusion
() which is followed by vector boson fusion
and associated production at the LHC. We find that the total diphoton cross
section of the axion can be fitted with the observed excess. Combining the
requirement on the cross-section, such that it reproduces the diphoton excess
events, with the bounds on the total width ( GeV),
we obtain the effective coupling in the range
GeV GeV. Within
this window of allowed couplings the model favours a narrow width resonance and
. In addition, we observe that the associated
production can potentially
produce a sizeable number of three photon events at future LHC and colliders. However, the rare decay is found to be too small to be probed at the LHC.Comment: 10 pages, 3 figures; Minor revision, updated references to be
consistent with PLB published versio
Exotic Lepton Searches via Bound State Production at the LHC
Heavy long-lived multi-charged leptons (MCLs) are predicted by various new
physics models. These hypothetical MCLs can form bound states, due to their
high electric charges and long life times. In this work, we propose a novel
strategy of searching for MCLs through their bound state productions and
decays. By utilizing LHC-8 TeV data in searching for resonances in the diphoton
channel, we exclude the masses of isospin singlet heavy leptons with electric
charge (in units of electron charge) lower than 1.2 TeV,
which are much stronger than the corresponding 8 TeV LHC bounds from analysing
the high ionisation and the long time-of-flight of MCLs. By utilising the
current 13 TeV LHC diphoton channel measurements the bound can further exclude
MCL masses up to 1.6 TeV for . Also, we demonstrate that the
conventional LHC limits from searching for MCLs produced via Drell-Yan
processes can be enhanced by including the contribution of photon fusion
processes.Comment: 9 pages, 3 figures, Updated to match PL
A Comparison of Fluorescence and ETR Between Malosma laurina and Rhus integrifolia
Malosma laurina and Rhus integrifolia are both native species to the Santa Monica Mountains and belong to the same family, Anacardiaceae. The two natives have lived alongside each other but in recent years M. laurina has been heavily affected by the prolonged drought. The Malosma laurina population in the Santa Monica Mountains has withstood wildfires and droughts, and has remained relatively stable and healthy up until recently. A recent Pepperdine graduate published her findings explaining the high levels of dieback in Malosma laurina and attributed it to the fungus, B. dothidea. We hypothesized that Rhus integrifolia would have higher fluorescence and ETR rates because there have been no recorded cases of Rhus integrifolia being infected by the fungus or that it would physiologically outperform M. laurina. We concluded that there was no significant difference in light and dark adapted fluorescence rates between both plants. However, Malosma laurina proved to have a significanty higher electron transport rate
Flow around submerged groynes in a sharp bend using a 3D LES model
River hydrodynamicsInteraction with structure
Beliefs as Self-Sustaining Networks: Drawing Parallels Between Networks of Ecosystems and Adults’ Predictions
In this paper, we argue that beliefs share common properties with the self-sustaining networks of complex systems. Matching experiences are said to couple with each other into a mutually reinforcing network. The goal of the current paper is to spell out and develop these ideas, using our understanding of ecosystems as a guide. In Part 1 of the paper, we provide theoretical considerations relevant to this new conceptualization of beliefs, including the theoretical overlap between energy and meaning. In Part 2, we discuss the implications of this new conceptualization on our understanding of belief emergence and belief change. Finally, in Part 3, we provide an analytical mapping between beliefs and the self-sustaining networks of ecosystems, namely by applying to behavioral data a measure developed for ecosystem networks. Specifically, average accuracies were subjected to analyses of uncertainty (H) and average mutual information (AMI). The ratio between these two values yields degree of order, a measure of how organized the self-sustained network is. Degree of order was tracked over time and compared to the amount of explained variance returned by a categorical nonlinear principal components analysis (CATPCA). Finding high correspondence between the two measures of order, together with the theoretical groundwork discussed in Parts 1 and 2, lends preliminary validity to our theory that beliefs have important similarities to the structural characteristics of self-sustaining networks
Study Effect of Gandaria Fruit Concentration on Seaweed (Eucheuma cottonii) Jelly Candy
The purpose of the research was to determine the chemical, physical and organoleptic characteristics of jelly candy with the addition of gandaria flesh. This study used a single randomized complete design with 5 treatment level and 2 replications. The treatment levels in this study were: P1 (Meat Gandaria), P2 (25% Meat Gandaria), P3 (50% Meat Gandaria), P4 (75% Meat Gandaria), P5 (100% Meat Gandaria). The results showed that the treatment using doubles flesh was better than the others because it had a water content (16,70%), ash content (0,92%), total sugar (23,71%), pH (5,25%), total acid (8,05%). The seaweed jelly candy turned out to be preferred by panelists in all categories of hedonic of taste (2,65%), aroma (2,35%), color (2,65%), texture (2,7%), general acceptance (2,9%), level of acidity (2,35%)
The VANDELS survey: Dust attenuation in star-forming galaxies at
We present the results of a new study of dust attenuation at redshifts based on a sample of star-forming galaxies from the VANDELS
spectroscopic survey. Motivated by results from the First Billion Years (FiBY)
simulation project, we argue that the intrinsic spectral energy distributions
(SEDs) of star-forming galaxies at these redshifts have a self-similar shape
across the mass range log probed by
our sample. Using FiBY data, we construct a set of intrinsic SED templates
which incorporate both detailed star formation and chemical abundance
histories, and a variety of stellar population synthesis (SPS) model
assumptions. With this set of intrinsic SEDs, we present a novel approach for
directly recovering the shape and normalization of the dust attenuation curve.
We find, across all of the intrinsic templates considered, that the average
attenuation curve for star-forming galaxies at is similar in shape
to the commonly-adopted Calzetti starburst law, with an average
total-to-selective attenuation ratio of . We show that the
optical attenuation () versus stellar mass () relation
predicted using our method is consistent with recent ALMA observations of
galaxies at in the \emph{Hubble} \emph{Ultra} \emph{Deep} \emph{Field}
(HUDF), as well as empirical relations predicted by a
Calzetti-like law. Our results, combined with other literature data, suggest
that the relation does not evolve over the redshift range
, at least for galaxies with log.
Finally, we present tentative evidence which suggests that the attenuation
curve may become steeper at log.Comment: 16 pages, 12 figures, accepted for publication in MNRA
The VANDELS survey: Dust attenuation in star-forming galaxies at
We present the results of a new study of dust attenuation at redshifts based on a sample of star-forming galaxies from the VANDELS
spectroscopic survey. Motivated by results from the First Billion Years (FiBY)
simulation project, we argue that the intrinsic spectral energy distributions
(SEDs) of star-forming galaxies at these redshifts have a self-similar shape
across the mass range log probed by
our sample. Using FiBY data, we construct a set of intrinsic SED templates
which incorporate both detailed star formation and chemical abundance
histories, and a variety of stellar population synthesis (SPS) model
assumptions. With this set of intrinsic SEDs, we present a novel approach for
directly recovering the shape and normalization of the dust attenuation curve.
We find, across all of the intrinsic templates considered, that the average
attenuation curve for star-forming galaxies at is similar in shape
to the commonly-adopted Calzetti starburst law, with an average
total-to-selective attenuation ratio of . We show that the
optical attenuation () versus stellar mass () relation
predicted using our method is consistent with recent ALMA observations of
galaxies at in the \emph{Hubble} \emph{Ultra} \emph{Deep} \emph{Field}
(HUDF), as well as empirical relations predicted by a
Calzetti-like law. Our results, combined with other literature data, suggest
that the relation does not evolve over the redshift range
, at least for galaxies with log.
Finally, we present tentative evidence which suggests that the attenuation
curve may become steeper at log.Comment: 16 pages, 12 figures, accepted for publication in MNRA
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Resolving Alliance Ruptures from an Attachment-Informed Perspective.
In this article, we examine how the different attachment patterns enable or hinder the resolution of ruptures in the therapeutic alliance. We try to show that secure and insecure patients alike may experience ruptures in the therapeutic alliance, but that their ability to participate in resolving such ruptures differ markedly. Recent findings with the Patient Attachment Coding System (PACS) show that attachment classifications manifest in psychotherapy as distinct ways of communicating about present internal experience. Secure patients disclose their present experience openly and invite attunement from the therapist, while insecure patients either minimize their contributions to the dialogue (avoidant) or the contributions of the therapist (preoccupied). Using examples from session transcripts, we demonstrate how secure patients are particularly responsive to resolution strategies that focus on here-and-now experience, while insecure patients' characteristic ways of communicating pose significant challenges to the resolution process
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