87 research outputs found
Beyond the standard model physics at RHIC in polarized pp collision
A polarized hadron collider experiment must have a great discovery potential
for a search of physics beyond the standard model. Experimental data of various
symmetry tests at RHIC are going to be obtained within a few years. The author
developed a simulation tool, studying a sensitivity of hunting contact
interaction at RHIC by measuring parity violating spin asymmetries.Comment: 8 pages, 9 figure, Proc. of Praha-SPIN-200
New Physics at Polarized Hadronic Colliders
Concerning new physics beyond the Standard Model we explore the discovery and
analysis potentials of polarized (hadronic) experiments and we compare with the
unpolarized case. For discovery, beam polarization is helpful in the case of
purely hadronic new interactions. In any case, beam polarization provides us a
unique piece of information on the chiral and flavour structures.Comment: Latex file, 7 pages and 3 ps fig included with psfig.sty. To appear
in the proceedings of the ECT* workshop ``The Spin Structure of the Proton
and Polarized Collider Physics'', July 2001, Trento, Ital
Search and identification of Scalar and Vector Leptoquarks at HERA with polarization
We analyze the effects of Scalar and Vector Leptoquarks on various
observables in electron (positron) - proton deep inelastic scattering. In view
of the future program of the HERA collider, with a high luminosity and also
with polarization, we present the constraints that can be reached using this
facility for several Leptoquark scenarios. We address the question of the
identification of the nature of a discovered Leptoquark. We emphasize the
relevance of having polarized lepton and proton beams in order to disentangle
completely the various Leptoquark models. This study is also relevant in the
context of the TESLAHERA project.Comment: Version to appear in Eur.Phys.J.C. 3 typos have been correcte
Discovery potential for New Physics in view of the RHIC-Spin upgrade
In view of a possible upgrade of the RHIC-Spin program at BNL, concerning
both the machine and the detectors, we give some predictions concerning the
potentialities of New Physics detection with polarized proton beams. We focus
on parity-violating asymmetries in one-jet production due to contact terms or
to a new leptophobic neutral gauge boson. We comment on the main uncertainties
and we compare with unpolarized searches at Tevatron.Comment: Latex file, 9 pages and 1 ps fig included with psfig.st
Neodymium and gadolinium extraction from molten fluorides by reduction on a reactive electrode
This work describes the electrochemical extraction on a reactive cathode (Cu, Ni) of two lanthanides Ln (Ln = Nd and Gd) from molten LiF-CaF2 medium at 840 and 920°C for Nd and 940°C for Gd. Extraction runs have been performed and the operating conditions (cathodic material and temperature) optimised. The titration of the Nd and Gd concentrations in the melt during extraction used square wave voltammetry. At the end of each run, the residual Ln content was checked by ICP-AES; the extraction efficiencies of the two lanthanides were found to be more than 99.8% on both reactive substrates
Search for Scalar Leptoquarks with polarized protons (and neutrons) at HERA and future Machines
The effects of Scalar Leptoquarks in various channels have been analysed for
the HERA collider and also for an eventual new machine running at higher
energies. We emphasize the relevance of polarized beams.Comment: Latex file, 3 pages and 3 ps fig. Need style files :
twoside,fleqn,espcrc2,epsfig. To appear in the proceedings of the DIS99
Workshop, DESY-Zeuthen, Germany, April 199
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