6,993 research outputs found
Sturcture of the Goldstone Bosons
The feasibility of measuring the pion and kaon structure functions has been
investigated. A high luminosity electron-proton collider would make these
measurements feasible. Also, it appears feasible to measure these structure
functions in a nuclear medium. Simulations using the RAPGAP Monte Carlo of a
possible pion structure function measurement are presented.Comment: To appear in the proceedings of the Second Workshop on Physics with
an Electron Polarized Light-Ion Collider, 14-16 Sept 2000, Cambridge, Ma 6
pages, 5 figures, late
Characterizing a benchmark scenario for heavy Higgs boson searches in the Georgi-Machacek model
The Georgi-Machacek model is used to motivate and interpret LHC searches for
doubly- and singly-charged Higgs bosons decaying into vector boson pairs. In
this paper we study the constraints on and phenomenology of the "H5plane"
benchmark scenario in the Georgi-Machacek model, which has been proposed for
use in these searches. We show that the entire H5plane benchmark is compatible
with the LHC measurements of the 125 GeV Higgs boson couplings. We also point
out that, over much of the H5plane benchmark, the lineshapes of the two CP-even
neutral heavy Higgs bosons and will overlap and interfere when
produced in vector boson fusion with decays to or . Finally we
compute the decay branching ratios of the additional heavy Higgs bosons within
the H5plane benchmark to facilitate the development of search strategies for
these additional particles.Comment: 18 pages, 18 figures. v2: title changed, refs added, discussion
clarified, version accepted by PR
The pion parton distribution function in the valence region
The parton distribution function of the pion in the valence region is
extracted in a next-to-leading order analysis from Fermilab E-615 pionic
Drell-Yan data. The effects of the parameterization of the pion's valence
distributions are examined. Modern nucleon parton distributions and nuclear
corrections were used and possible effects from higher twist contributions were
considered in the analysis. In the next-to-leading order analysis, the high-
dependence of the pion structure function differs from that of the leading
order analysis, but not enough to agree with the expectations of pQCD and
Dyson-Schwinger calculations.Comment: 5 pages, 4 figures, submitted to Phys. Rev.
Some effects of the Atlantic circulation and of river discharges on the residual circulation of the North Sea
In a previous paper the simulation of the tidal and wind generated mean residual circulation in the North Sea was studied, with special references to pollution problems. In that paper, the influence of the Atlantic circulation on the North Sea has been neglected. Referring to the above mentioned paper, in this study the net inflow via the Dover Strait, Kattegat and rivers is simulated in the model. The model runs were repeated, yielding a significant improvement in comparison with observed data. © 1979 Deutsches Hydrographisches Institut
What can more Drell-Yan data tell us about QCD?
The Drell-Yan process may be used as a unique probe of the partonic structure of hadrons and of fundamental QCD interactions, providing complementary information to deep inelastic scattering (DIS) measurements. Drell-Yan provides the ability to distinguish between the quarks and antiquarks based on kinematics. Unpolarized Drell-Yan provides access to the longitudinal distributions antiquarks
in the proton. Angular distributions are sensitive to the h
â„ 1, Boer-Mulders, distribution. With the addition of polarization, other transverse momentum distributions (TMDs) can be accessed, including the Siversâ distribution, f â„ 1
Geochemical cycles in an ocean general circulation model. Preindustrial tracer distributions
A state-of-the-art report is given of the Hamburg model of the oceanic carbon cycle. The model advects geochemical tracers important to the carbon cycle by the currents of a general circulation model. The geochemical cycling is driven by a Michaelis - Menten type production kinetics. The model is an extension of the Bacastow and Maier-Reimer (1990) model. It is based-on-a more realistic current field and includes a mechanism of lysocline - sediment interaction. Principal variables are SIGMACO2, alkalinity. phosphate, oxygen, and silicate. The carbon variables are defined for C-12, C-13, and C-14 separately. In addition to these carbon isotopes, 39A and deltaO-18 of dissolved oxygen are predicted. The model predicts realistic global patterns of tracer distribution. In the equatorial eastern Pacific, however, the structures are exaggerated due to a strong upwelling which is a common feature of coarse resolution models of the general circulation of the ocean
College Studentsâ Disenfranchised Grief Following a Breakup: The Effect of Relationship Closeness and Perceived Stigma on Grief
Grief is a universal reaction to loss. Losses are often associated to the death of a loved one, however, they may also originate from the end of an intimate partner relationship. Whereas studies have focused on grief after a divorce or on symptomology students endure after a death, this article attends to the understudied college student experience of grief following a breakup. Within emerging adulthood, the loss of a close romantic relationship may be challenging to navigate alongside the daily stressors of college. Stigmatization by means of social cues convey sentiments, such as the need to get over an ex-partner, which in turn can lead to disenfranchised grief where individuals do not feel heard, accepted, or valid in their experience of grief. It was hypothesized that as endorsed closeness of the past relationship increases so does grief intensity, and that as feelings of stigmatization increase also increases grief intensity. Multiple regression models supported the main effects, although the interaction effect between levels of closeness and perceived stigmatization was not supported. Implications and future directions are discussed
- âŠ