1,547 research outputs found
Anomalous quartic WWgamma gamma, ZZgamma gamma, and trilinear WWgamma couplings in two-photon processes at high luminosity at the LHC
We study the W/Z pair production via two-photon exchange at the LHC and give
the sensitivities on trilinear and quartic gauge anomalous couplings between
photons and W/Z bosons for an integrated luminosity of 30 and 200 fb^{-1}. For
simplicity and to obtain lower backgrounds, only the leptonic decays of the
electroweak bosons are considered.Comment: 22 pages, 17 figures, sumitted to Phys. Rev.
Forward jets and forward -boson production at hadron colliders
In this talk we give a short review of forward jets and forward -boson
production at hadron colliders, in view of the extraction of footprints of BFKL
physics. We argue that at Tevatron energies, dijet production at large rapidity
intervals is still subasymptotic with respect to the BFKL regime, thus the
cross section is strongly dependent on the various cuts applied in the
experimental setup. In addition, the choice of equal transverse momentum cuts
on the tagging jets makes the cross section dependent on large logarithms of
non-BFKL origin, and thus may spoil the BFKL analysis. For vector boson
production in association with two jets, we argue that the configurations that
are kinematically favoured tend to have the vector boson forward in rapidity.
Thus jet production lends itself naturally to extensions to the
high-energy limit.Comment: LaTeX, JHEP style, 10 pages, 3 figures. Based on a talk at EPS2001,
Budapest, Hungar
Prospects for observation of double parton scattering with four-muon final states at LHCb
We study the prospects for observing double parton scattering through
four-muon final states, forming two opposite-sign muon pairs, in the LHCb
experiment in pp collisions at 14 TeV centre of mass energy. We consider two
special cases, namely double Drell-Yan and J/psi-pair production. The kinematic
properties and prospects for observing these processes are discussed. We find
that the production rate depends strongly on the origin of the four muons,
while many kinematic properties can be used to help identify the presence of
double parton scattering events.Comment: 22 pages, 12 figure
W + gamma + jet production as a test of the electromagnetic couplings of W at LHC and SSC
The reaction is considered at
centre-of-mass energies and 40\;\tev, including anomalous
three-gauge-boson couplings and . The possibility of
obtaining limits on these quantities by comparison with the standard model is
investigated. The radiation zero properties of the subprocess matrix elements
are studied. CERN-TH.6753/92, DTP/92/92.Comment: Latex. 5 figures available (EPS files) on reques
Epistemic decision theory applied to multiple-target tracking
A decision philosophy that seeks the avoidance of error by trading off belief of truth and value of information is applied to the problem of recognizing tracks from multiple targets (MTT). A successful MTT methodology should be robust in that its performance degrades gracefully as the conditions of the collection become less favorable to optimal operation. By stressing the avoidance, rather than the explicit minimization, of error, the authors obtain a decision rule for trajectory-data association that does not require the resolution of all conflicting hypotheses when the database does not contain sufficient information to do so reliably. This rule, coupled with a set-valued Kalman filter for trajectory estimation, results in a methodology that does not attempt to extract more information from the database than it contains
Profile of the U 5f magnetization in U/Fe multilayers
Recent calculations, concerning the magnetism of uranium in the U/Fe
multilayer system have described the spatial dependence of the 5f polarization
that might be expected. We have used the x-ray resonant magnetic reflectivity
technique to obtain the profile of the induced uranium magnetic moment for
selected U/Fe multilayer samples. This study extends the use of x-ray magnetic
scattering for induced moment systems to the 5f actinide metals. The spatial
dependence of the U magnetization shows that the predominant fraction of the
polarization is present at the interfacial boundaries, decaying rapidly towards
the center of the uranium layer, in good agreement with predictions.Comment: 7 pages, 6 figure
Improving the model checking of strategies under partial observability and fairness constraints
Reasoning about strategies has been a concern for several
years, and many extensions of Alternating-time Temporal Logic have been proposed. One extension, ATLKirF , allows the user to reason about the strategies of the agents of a system under partial observability and unconditional fairness constraints. However, the existing model-checking algorithm for ATLKirF is inefficient when the user is only interested in the satisfaction of a formula in a small subset of states, such as the set of
initial states of the system. We propose to generate fewer strategies by only focusing on partial strategies reachable from this subset of states, reducing the time needed to perform the verification. We also describe several practical improvements to further reduce the verification time and present experiments showing the practical impact of the approach
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