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Topic: Chargino

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	Higgsino - Wikipedia, the free encyclopedia
		The higgsino is a Dirac fermion and that is a weak isodoublet with hypercharge half under the Standard Model gauge symmetries.
		These states mix with the neutralinos and charginos from the bino and wino.
		A linear combination of the higgsino, bino and wino make up the lightest supersymmetric particle, which is a particle physics candidate for the dark matter of the universe.
	en.wikipedia.org /wiki/Higgsino (145 words)

	Circle Line SUSY at LC Questions (Site not responding. Last check: 2007-11-01)
		From simulation studies, and from the experience of LEP 2, the chargino should be observed at the LC with relatively small luminosity samples at masses up to 90% of the beam energy.
		It is typical that the second lightest neutralino is almost degenerate with the chargino.
		Presumably, the best strategy is to study the lighter chargino and use its properties to predict the location of the heavier one.
	theory.fnal.gov /CircleLine/Michaelqueries.html (2609 words)

	Search for charginos mass degenerate with the LSP
		In that case, the standard search for charginos does not work and different searching strategies must be applied.
		Lower limit at the 95% CL of the difference between the number of chargino events expected and the ones allowed in the data (it depends on the candidates found and on the background computed), as a function of the chargino mass.
		In correspondence of any chargino mass, the mass of the sneutrino has been let vary, but only for values of the mass greather than (mass of the chargino + 2 GeV/c²): for lower sneutrino masses, the lifetime shorten quickly, thus removing any significance also to the limits obtained with the decay length methods.
	delphiwww.cern.ch /delfigs/figures/search/chadeg172/char_dege.html (803 words)

	[No title] (Site not responding. Last check: 2007-11-01)
		The results for both selections can be translated into 95% CL upper limits on the cross section for associated production of charginos and neutralinos with decays into final states with 3 leptons.
		Since both analyses cover a couple of decay channels each, the results are given as limits on the cross section of the process chargino+neutralino -> 3 leptons + X, assuming equal branching fractions into the lepton flavours, which is common as long as the leptons are mass degenerate (for neglegible stau mixing).
		They are valid for parameter combinations with comparable chargino and neutralino mass relations, which is true for a large part of the mSUGRA parameter space.
	www-d0.fnal.gov /Run2Physics/np/results/LP2003/trileptons (305 words)

	Chargino Mass Determination At a Muon Collider (ResearchIndex) (Site not responding. Last check: 2007-11-01)
		Chargino Mass Determination At a Muon Collider (ResearchIndex)
		Chargino Mass Determination At a Muon Collider (1998)
		We find that for a gaugino-like chargino of mass 100--200 GeV, a measurement better than 50-- 300 MeV should be possible with 50 fb \Gamma1 integrated luminosity.
	citeseer.ist.psu.edu /barger98chargino.html (297 words)

	Scientific Commons: Search for Chargino and Neutralino Production at $\sqrt{s}$ = 181-184 GeV at LEP, Array [Abbiendi, ...
		A search for charginos and neutralinos, predicted by supersymmetric theories, has been performed using a data sample of 57 pb-1 at centre-of-mass energies of 181-184 GeV taken with the OPAL detector at LEP.
		Upper limits on chargino and neutralino pair production cross-sections are obtained as a function of the chargino mass, the lightest neutralino mass, and the second lightest neutralino mass.
		Exclusion regions at 95% confidence level of parameters of the Constrained Minimal Supersymmetric Standard Model are determined for the case of a large universal scalar mass, m_0, implying heavy scalar fermions, and for the case of a small m_0 resulting in light scalar fermions and giving the worst-case limits.
	en.scientificcommons.org /805711 (304 words)

	Reconstructing the chargino system at e+e- linear colliders
		By measuring the total cross sections and the asymmetries with polarized beams, the chargino masses and the gaugino-higgsino mixing angles of these states can be determined accurately.
		are kinematically accessible in a first phase of the machine, transverse beam polarization or the measurement of chargino polarization in the final state is needed to determine the mixing angles.
		The remaining two-fold ambiguity of the phase can be resolved by measuring the normal polarization of the charginos.
	www.edpsciences.org /articles/epjc/abs/2000/11/epjc0365/epjc0365.html (222 words)

	UCLA - CDF: Analyses
		Charginos and Neutralinos could be produced in p-pbar
		We have studied the physics potential of Run 2 for the trilepton search, one of the premier signatures of Supersymmetry expected to be observable at the Tevatron.
		Our analysis is based on the Run 1 analysis, and gives an expected sensitivity to chargino-neutralino production for chargino masses of up to 150 GeV/c^2, depending on the MSSM parameters.
	www.physics.ucla.edu /cdf/cdf/analyses (157 words)

	Eingang zum Volltext (Site not responding. Last check: 2007-11-01)
		For the chargino pair production with subsequent two-body decay of one of the charginos we have shown that charge and beam polarization asymmetries in the energy distributions of the decay particles are sensitive to the interference of scalar exchange channels with different CP quantum numbers.
		For the chargino pair production with subsequent two-body decays of both charginos we have defined energy distribution and angular asymmetries in the final particles, in order to analyze the spin-spin correlations of the charginos.
		The transverse polarizations of the charginos are sensitive to the CP quantum number of the exchanged Higgs bosons and can thus be used to separate overlapping resonances, as well as to determine the CP quantum number of a single resonance.
	www.bibliothek.uni-wuerzburg.de /opus/frontdoor.php?source_opus=1842 (1204 words)

	Chargino - Biocrawler (Site not responding. Last check: 2007-11-01)
		New: Biocrawler.com now with the option to add inline videos.
		In particle physics, chargino refers to the mass eigenstates of a charged superpartner, i.e.
		You can find it there under the keyword Chargino (http://en.wikipedia.org/wiki/Chargino)The list of previous authors is available here: version history (http://en.wikipedia.org/w/index.php?title=Charginoandaction=history).
	www.biocrawler.com /encyclopedia/Chargino (141 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		For a chargino that is mostly gaugino, the parameter space can now be restricted to a small region; tan{beta} is constrained, the soft electroweak gaugino and electron sneutrino masses are determined to about 10{percent}, and the sign of{mu} may be determined.
		Constraints for a chargino that is mostly Higgsino are much weaker, but still disfavor the hypothesis that the chargino is mostly gaugino.
		For a chargino which is a roughly equal mixture of Higgsino and gaugino, we find intermediate results.{copyright}{ital 1997}{ital The American Physical Society}
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=450541&query_id=0 (324 words)

	Scientific Commons: Search for chargino and neutralino production at $\sqrt{s}$ = 170 and 172 GeV at LEP, Array ...
		A search for charginos and neutralinos, predicted by supersymmetric theories, has been performed using a data sample of 10.3 pb^-1 at centre-of-mass energies of sqrt(s) = 170 and 172 GeV with the OPAL detector at LEP.
		The results are combined with those from previous OPAL chargino and neutralino searches at lower energies to obtain limits.
		The lower limit on the lightest neutralino mass at 95% C.L. for tan(beta) >= 1.0 is 24.7 GeV for m_0 = 1 TeV and 13.3 GeV for the minimum m_0 scenario.
	en.scientificcommons.org /789296 (226 words)

	Search for chargino and neutralino production at GeV at LEP
		A search for charginos and neutralinos, predicted by supersymmetric theories, is performed using a data sample of 182.1 pb
		No evidence for chargino or neutralino production is found.
		) cross-sections are obtained as a function of the chargino mass (
	www.edpsciences.org /articles/epjc/abs/2000/10/epjc0346/epjc0346.html (170 words)

	Measuring the chargino parameters (Site not responding. Last check: 2007-11-01)
		After the supersymmetric particles have been discovered, the priority will be to determine independently the fundamental parameters to reveal the structure of the underlying supersymmetric theory.
		In my talk I discuss how the chargino sector can be reconstructed completely by measuring the cross-sections with polarized beams at e
		The closure of the two-chargino system can be investigated by analysing sum rules for the production cross-sections.
	www.ias.ac.in /pramana/v55/p259/abs.htm (82 words)

	C. Physics Measurements at the NLC
		Here is a list of measurements that can be made in order to verify that nature is supersymmetric, and to make precision measurements of the supersymmetric parameters:
		Search for the NLSP (next-to-lightest supersymmetric particle); if this is the chargino, then look for
		particle, the chargino mass is related to the mSUGRA parameter
	hep-www.colorado.edu /~nlc/SUSY_Wagner/susy/node8.html (316 words)

	Searches for Chargino and Neutralino Production at LEP2
		Searches for charginos and neutralinos, predicted by supersymmetric theories, have been performed using the OPAL detector at LEP.
		An upper limit on the chargino pair production cross section has been obtained as a function of the chargino mass and the lightest neutralino mass, assuming the chargino decays into a W boson and the lightest neutralino.
		An upper limit on the neutralino pair production cross section has also been obtained as a function of the second lightest neutralino mass and the lightest neutralino mass, assuming decays via a Z boson.
	flux.aps.org /meetings/YR99/CENT99/abs/S3045011.html (140 words)

	Search for R-parity Violating Chargino and Neutralino Decays in e (ResearchIndex)
		Abstract: A search for chargino and neutralino pair production in e + e - collisions at centerof -mass energies between 161 GeV and 183 GeV is performed under the assumptions that R-parity is not conserved and that only purely leptonic or hadronic R-parity violating decays are allowed.
		Limits on the production cross sections, on the Minimal Supersymmetric Standard Model parameters and on the masses of the supersymmetric particles are derived.
		2 Search for Charginos and Neutralinos in e + e - Collisions a..
	citeseer.ist.psu.edu /360348.html (349 words)

	Citebase - Measuring SUSY Parameters at LEP II Using Chargino Production and Decay (Site not responding. Last check: 2007-11-01)
		Authors: Feng, Jonathan L. Strassler, Matthew J. Previously, in the context of the minimal supersymmetric standard model (without em a priori assumptions of parameter unification), we studied the constraints on weak-scale SUSY parameters from chargino production at LEP II, using as observables mch, mLSP, the cross section and the leptonic branching fraction.
		For a chargino that is mostly gaugino, the parameter space can now be restricted to a small region; tanb is constrained, the soft electroweak gaugino and electron sneutrino masses are determined to about 10%, and the sign of μ may be determined.
		For a chargino which is a roughly equal mixture of Higgsino and gaugino, we find intermediate results.
	www.citebase.org /cgi-bin/citations?id=oai:arXiv.org:hep-ph/9606477 (238 words)

	NSDL Metadata Record -- $CP$ violation in minimal supersymmetric standard model
		The electric dipole moments of the neutron and the electron are large, but can be smaller than their experimental upper bounds if the scalar quarks and leptons are heavier than a few TeV.
		$T$ violating asymmetries in the production processes of the different neutralino pair and the different chargino pair emerge at the tree level.
		In a pair production of the charginos of the same mass, the asymmetry emerges through the electric and the weak "electric" dipole moments of the charginos at the loop level, but its magnitude is at most of order $10^{-4}$.
	nsdl.org /mr/1284108 (205 words)

	Vienna SUSY Group - List of Talks (Site not responding. Last check: 2007-11-01)
		Eberl: Invited talk - Charginos and neutralinos at one-loop level: Higgs decays and a method for determination of their parameters at a 1 TeV linear collider
		Eberl: One-loop corrections to chargino and neutralino mass matrices in the onshell scheme.
		Eberl: One-loop corrections to the chargino and neutralino mass matrices in the on-shell scheme.
	wwwhephy.oeaw.ac.at /p3w/theory/susy/talks.html (2123 words)

	[No title] (Site not responding. Last check: 2007-11-01)
		There are some conditions for non-physical parameters that generate a warning, but let the computation continue.
		These are: Too light charginos Existence of sfermion VeV These conditions can be turned into "errors" by editing the "interfaces" file.
		Script Output files Meaning ----------------------------------------------------------------./dobr b mu sbc_mu________out.dat_br1 Branching ratios (with sbc_mu________out.dat_br2 and without corrections) of the "sbottom"_1 and "sbottom"_2./docorbr b mu sbc_mu________out.dat_cbr1 Absolute corrections to sbc_mu________out.dat_cbr1 the Branching ratios of the "sbottom"_1 and "sbottom"_2./dototalgamma b mu sbc_mu________out.dat_totalgamma Sum of all the partials decay widths of "sbottom" -> (chargino or neutralino) with and without corrections.
	www.ecm.ub.es /~guasch/progs/sfdecay/README.txt (1985 words)

	Vienna SUSY Group - Publication List
		Analysis of the chargino and neutralino mass parameters at one-loop level
		One-loop corrections to the chargino and neutralino mass matrices in the on-shell scheme
		Vector Bosons and Higgs Bosons as Signatures for Charginos and Neutralinos
	wwwhephy.oeaw.ac.at /susy/publist.html (2801 words)

	STEFANs Homepage (Site not responding. Last check: 2007-11-01)
		The chargino search at LEP was the most important SUSY search in general due to the
		the chargino search have been performed using several different event topologies and
		Chargino talk at Delphi SUSY meeting, 27/11-2001 (PDF)
	www.hep.lu.se /staff/ask/PhD/chargino.html (203 words)

	Research Interests of Rick Van Kooten
		Searches for New Particles, in particular Supersymmetric (SUSY) particles including charginos, neutralinos, sleptons, SUSY Higgs, etc.
		From the above, scans of SUSY parameter space done on Indiana University HEP computers place exclusion limits on masses of charginos and neutralinos.
		A big jump in the mass limit of the lightest neutralino now has significant impact on the suitability of this "weakly interacting massive particle" (WIMP) as a candidate for dark matter even compared to direct searches for neutralinos in non-accelerator experiments using cryogenic detectors for observing nuclear recoils.
	hep.physics.indiana.edu /~rickv/research.html (823 words)

	Johns Hopkins University Particle Physics susy
		An example is the production of chargino-neutralino pairs (charginos are mixtures of Winos and charged Higgsinos, neutralinos are mixtures of Zinos and neutral Higgsinos).
		In this example, an excess of events with three charged leptons and missing E
		The mass of the chargino can be determined from the maximum mass of the opposite sign charged-lepton pair.
	www.pha.jhu.edu /~morris/jhu_hep/susy.html (333 words)

	Supersymmetry
		Sneutrino cascade decays ~nu_e -> e- ~X_1^+ -> e- f f' ~X_1^0 as a probe of chargino spin properties and CP violation,
		An upper bound on the mass of the lightest neutralino,
		A lower limit on the neutralino mass in the MSSM with non-universal gaugino masses,
	www.nu.to.infn.it /SUSY (1600 words)

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