Search for neutralino production in Z decays

Décamp, D.; Deschizeaux, B.; Goy, C.; Lees, J. P.; Minard, M.-N.; Ajaltouni, Z.; Bardadin-Otwinowska, M.; Falvard, A.; Henrard, P.; Jousset, J.; Michel, B.; Montret, Jean-Claude; Pallin, D.; Perret, P.; Proriol, J.; Prulhière, F.; Badier, J.; Blondel, A.; Bonneaud, G. R.; Bourotte, J.; Braems, F.; Brient, J. C.; Ciocci, M. A.; Fouque, G.; Guirlet, R.; Rougé, A.; Rumpf, M.; Tanaka, R.; Videau, H.; Videau, I.; Albanèse, J.P.; Aubert, J.J.; Benchouk, C.; Bonissent, A.; Courvoisier, D.; Etienne, F.; Matsinos, E.; Papalexiou, S.; Payre, P.; Pietrzyk, B.; Qian, Z.; Bertín, V.; Bouard, G. de; Boucrot, J.; Callot, O.; Chen, X.; Cordier, A.; Davier, M.; Ganis, G.; Grivaz, J.-F.; Heusse, P.; Janot, P.; Journé, V.; Kim, D.W.; Lefrançois, J.; Lutz, A. M.; Veillet, J. J.; Zomer, F.

doi:10.1016/0370-2693(90)90361-9

Cited by 47 publications

(7 citation statements)

References 24 publications

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“…This is now called: the EGM effect (from the initials of Evolution of Gaugino Masses). To compute the energy threshold using only the 'running' of the gauge couplings (α 1 , α 2 , α 3 ) corresponds to neglecting nearly three orders of magnitude in the energy threshold for the discovery of the first particle (the lightest) of the Superworld [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: The Unification Of All Fundamental Forcesmentioning

confidence: 99%

Time-Shift in the Opera Setup: Proof Against Superluminal Neutrinos Without the Need of Knowing the Cern–lngs Distance and Reminiscences on the Origin of the Gran Sasso Lab, of the Third Neutrino and of the "Teramo Anomaly"

Zichichi¹

2012

Int. J. Mod. Phys. A

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The LVD time stability allows one to establish a time-shift in the OPERA experiment, thus providing the first proof against superluminal neutrinos, using the horizontal muons of the "Teramo Anomaly." This proof is particularly interesting since it does not need the knowledge of the distance between the location at which the neutrinos are produced (CERN) and the location they are detected (LNGS). Since the superluminal neutrinos generated in the physics community a vivid interest in good and bad behavior in physics research, the author thought it was appropriate to recall the origin of the Gran Sasso Lab, of the third neutrino, of the horizontal muons due to the "Teramo Anomaly" and of the oscillation between leptonic flavors, when the CERN–Gran Sasso neutrino beam was included in the project for the most powerful underground laboratory in the world.

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Section: The Unification Of All Fundamental Forcesmentioning

confidence: 99%

Time-Shift in the Opera Setup: Proof Against Superluminal Neutrinos Without the Need of Knowing the Cern–lngs Distance and Reminiscences on the Origin of the Gran Sasso Lab, of the Third Neutrino and of the "Teramo Anomaly"

Zichichi¹

2012

Int. J. Mod. Phys. A

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“…The non-observation of such spectacular event topologies have led to lower bounds very close to M Z 2 on the masses of these sparticles. Finally, LEP experiments have also searched [48] for neutralino production via Z → χ 0 1 χ 0 2 and Z → χ 0 2 χ 0 2 decays, assuming that χ 0 2 → Fig. 1 for various values of tan β.…”

Section: Current Status Of Supersymmetry Searchesmentioning

confidence: 99%

Low Energy Supersymmetry Phenomenology

Baer

Bartl

Brhlik

et al. 1997

Advanced Series on Directions in High Energy Physics

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We summarize the current status and future prospects for low energy (weak scale) supersymmetry. In particular, we evaluate the capabilities of various e + e − , pp and pp colliders to discover evidence for supersymmetric particles. Furthermore, assuming supersymmetry is discovered, we discuss capabilities of future facilities to dis-entangle the anticipated spectrum of super-particles, and, via precision measurements, to test mass and coupling parameters for comparison with various theoretical expectations. We comment upon the complementarity of proposed hadron and e + e − machines for a comprehensive study of low energy supersymmetry.Lawrence Berkeley Laboratory is an equal opportunity employer.ii 1 Goal of this study and outlineThe recent demise of the Superconducting Supercollider project in the United States has led to the need for a re-evaluation of directions for not only the U.S., but indeed for the world High Energy physics community. The goal of this report is to evaluate the capabilities of current and future experimental facilities with respect to the search for weak scale supersymmetric particles. To this end, we only review analyses that attempt to make a more or less detailed study of experimental signatures and backgrounds in e + e − , pp, and pp interactions. Other aspects of supersymmetry model building and phenomenology are discussed in the accompanying review by Drees and Martin [1]. It is hoped that the information reviewed in this report will serve as an aid to the decision making process of how to most wisely allocate limited resources such that progress in supersymmetry phenomenology (in particular) and high energy physics (in general) can be maximized.This report is organized into the following sections.

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“…Unlike charginos, neutralinos may completely decouple from the Z 0 , and for this reason, there are no strict lower bounds on neutralino masses. If one assumes gaugino mass unification and tan β > 2, the lower bound on the lightest neutralino's mass is 20 GeV [1,2,3]. For tan β < ∼ 1.6, however, this mass bound disappears altogether [2,3].…”

Section: Z 0 Width Constraintsmentioning

confidence: 99%

“…If one assumes gaugino mass unification and tan β > 2, the lower bound on the lightest neutralino's mass is 20 GeV [1,2,3]. For tan β < ∼ 1.6, however, this mass bound disappears altogether [2,3]. It is clear, then, that a discussion of light neutralinos requires a detailed analysis of their couplings to the Z 0 boson.…”

Section: Z 0 Width Constraintsmentioning

confidence: 99%

The light Higgsino-gaugino window

Feng

Polonsky²,

Thomas

1996

Physics Letters B

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Supersymmetric models are typically taken to have µ parameter and all soft supersymmetry breaking parameters at or near the weak scale. We point out that a small window of allowed values exists in which µ and the electroweak gaugino masses are in the few GeV range. Such models naturally solve the supersymmetry CP problem, can reduce the discrepancy in R b , and suppress proton decay. In this window two neutralinos are in the few GeV range, two are roughly degenerate with the Z 0 , and both charginos are roughly degenerate with the W ± bosons. Such a signature cannot escape detection at LEP II. Models that fall in this window automatically arise from renormalizable hidden sectors in which hidden sector singlets participate only radiatively in supersymmetry breaking.

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Search for neutralino production in Z decays

Cited by 47 publications

References 24 publications

Time-Shift in the Opera Setup: Proof Against Superluminal Neutrinos Without the Need of Knowing the Cern–lngs Distance and Reminiscences on the Origin of the Gran Sasso Lab, of the Third Neutrino and of the "Teramo Anomaly"

Time-Shift in the Opera Setup: Proof Against Superluminal Neutrinos Without the Need of Knowing the Cern–lngs Distance and Reminiscences on the Origin of the Gran Sasso Lab, of the Third Neutrino and of the "Teramo Anomaly"

Low Energy Supersymmetry Phenomenology

The light Higgsino-gaugino window

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