2,244 research outputs found
Can Polarised Drell-Yan Shed More Light On The Proton Spin?
We analyse polarised Drell-Yan process using the factorisation method and
derive operator definitions for polarised parton distribution functions. We
demonstrate that a factorisation analogous to that in the unpolarised Drell-Yan
case holds in this process. We study the leading order gluonic contribution to
the first moment of polarised Drell-Yan function and show that it is consistent
with results obtained from polarised deep inelastic scattering.Comment: 12 page
NNLO Corrections to the Polarized Drell-Yan Coefficient Function
We present the full next-to-next-to-leading order (NNLO) corrections to the
coefficient function for the polarized cross section of
the Drell-Yan process. We study the effect of these corrections on the process
at an C.M. energy . All QCD partonic
subprocesses have been included provided the lepton pair is created by a
virtual photon, which is a valid approximation for a lepton pair invariant mass
. For this reaction the dominant subprocess is given by and its higher order corrections so that it provides us with an
excellent tool to measure the polarized sea-quark densities.Comment: 5 pages, 5 figures, 7th DESY Workshop on Elementary Particle Theory,
Loops and Legs in Quantum Field Theory, Zinnowitz, Germany, April 25-30, 200
Production of a KK-graviton and a Vector Boson in ADD Model via Gluon fusion
In the models with large extra-dimensions, we examine the production of a
vector boson (\gamma / Z) in association with the Kaluza-Klein (KK) modes of
the graviton via gluon fusion. At the leading order, the process takes place
through quark-loop box and triangle diagrams and it is ultraviolate finite. We
report the results for the LHC. We also discuss the issues of anomaly and
decoupling of heavy quarks in the amplitude.Comment: 12 pages, 8 figures, some references and a note in the appendix adde
Conservation and management of marine fishery resources of Kerala State, India
The highly productive fisheries of Kerala, India, are suffering from overexploitation. Use of unsuitable fishing gears that result in a high level of wasteful bycatch and destruction of egg bearing and juvenile fish should be controlled. This paper makes some suggestions for monitoring and conservation of the fisheries in Kerala
Higgs boson production through annihilation at threshold in NLO QCD
We present threshold enhanced NLO QCD corrections to inclusive Higgs
production through bottom anti-bottom annihilation at hadron colliders using
threshold resummed cross section. The resummed cross section is obtained using
factorization properties and Sudakov resummation of the inclusive cross
section. We use the recent results on threshold NLO corrections in QCD for
Drell-Yan production and three loop QCD corrections to Higgs form factor with
bottom anti-bottom quark to achieve this task. This is the first step towards
the evaluation of complete NLO result. We have numerically demonstrated the
importance of such corrections at the LHC.Comment: 15 pages, 1 figur
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