Search for neutralinos in Z decays

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doi:10.1016/0370-2693(95)00260-r

Cited by 47 publications

(22 citation statements)

References 46 publications

(5 reference statements)

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“…In the MSSM, LEP data imply a lower bound of 23 GeV for the lightest neutralino [5]. Neutralino production and decay has been discussed in great detail in refs.…”

Section: Introductionmentioning

confidence: 99%

Production and decay of neutralinos in the Next-to-Minimal Supersymmetric Standard Model

Franke

Fraas

1996

Z. Phys. C - Particles and Fields

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Within the framework of the Next-To-Minimal Supersymmetric Standard Model (NMSSM) we study neutralino production e + e − −→χ 0 iχ 0 j (i, j = 1, . . . , 5) at center-of-mass energies between 100 and 600 GeV and the decays of the heavier neutralinos into the LSP plus a fermion pair, a photon or a Higgs boson. For representative gaugino/higgsino mixing scenarios, where the light neutralinos have significant singlet components, we find some striking differences between the NMSSM and the minimal supersymmetric model. Since in the NMSSM neutralino and Higgs sector are strongly correlated, the decay of the second lightest neutralino into a Higgs boson and the LSP often is kinematically possible and even dominant in a large parameter region of typical NMSSM scenarios. Also, the decay rates into final states with a photon may be enhanced.November 1995 *

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“…In the MSSM, LEP data imply a lower bound of 23 GeV for the lightest neutralino [5]. Neutralino production and decay has been discussed in great detail in refs.…”

Section: Introductionmentioning

confidence: 99%

Production and decay of neutralinos in the Next-to-Minimal Supersymmetric Standard Model

Franke

Fraas

1996

Z. Phys. C - Particles and Fields

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“…For instance, in Ref. [21], the analysis is performed by considering the bounds on Γ(Z 0 →χ 0 1χ 0 1 ) from the invisible Z 0 width and those on Γ(Z 0 →χ 0 1χ 0 2 ,χ 0 2χ 0 2 ) from the direct search of neutralinos. However, only the decaysχ 0 2 →χ 0 1 Z ( * ) →χ 0 1 ff are fully taken into account, while the radiative decay, although generally dominant in this region, is not properly stressed.…”

Section: Introductionmentioning

confidence: 99%

“…By using Eqs. (21), one can single out degeneracy scenarios with m o i = ±m o j = µ. In order to realize the case with two same-sign degenerate eigenvalues, the general condition (22) gives rise to interesting scenarios, it is useful to consider here, in addition to tan β → 1, the special limit sin 2 θ W = 0, which allows a simplified analytical treatment.…”

Section: Introductionmentioning

confidence: 99%

“…The latter cases, needing m i = M 1 , cannot be directly derived from the two branches in Eq. (21). The correct procedure to get them is to solve the eigenvalue equation with respect to µ or M 1 , by applying both the limits tan β → 1 and sin 2 θ W → 0 simultaneously.…”

Section: Introductionmentioning

confidence: 99%

“…All the tan β = 1 scenarios above are derived by forcing the two branches in Eqs. (21) to meet in a point of the (m i , µ) plane, corresponding to a strict degeneracy m o i = m o j . However, as done above in the limit (M 1 − M 2 ) → 0 with Eq.…”

Section: Introductionmentioning

confidence: 99%

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Supersymmetric scenarios with dominant radiative neutralino decay

Ambrosanio

Mele

1997

Phys. Rev. D

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The radiative decay of the next-to-lightest neutralino into a lightest neutralino and a photon is analyzed in the minimal supersymmetric standard model. We find that significant regions of the supersymmetric parameter space with large radiative branching ratios ͑up to about 100%͒ do exist. The radiative channel turns out to be enhanced when the neutralino tree-level decays are suppressed either ''kinematically'' or ''dynamically.'' In general, in the regions allowed by data from CERN LEP and not characterized by asymptotic values of the supersymmetric parameters, the radiative enhancement requires tan␤Ӎ1 and/or M 1 ӍM 2 , and negative values of . We present typical scenarios where these conditions are satisfied, relaxing the usual relation M 1 ϭ 5 3 tan 2 W M 2 , i.e., gaugino mass unification at the grand unified theory scale. The influence of varying the top-squark masses and mixing angle when the radiative decay is enhanced is also considered. Some phenomenological consequences of the above picture are discussed. ͓S0556-2821͑97͒01503-8͔PACS number͑s͒: 14.80.Ly, 12.60.Jv 2 In checking the results of Ref. ͓6͔, we found that the first line in Eq. ͑59͒, p. 281, should be more properly written asIn this way, it can also be correctly generalized to the f ϭb,,... case, by substituting T 3t , e t , t →T 3 f , e f , f . PHYSICAL

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Search for charginos, neutralinos and gravitinos at LEP

Andersson¹,

Min²,

Hernández³

et al. 1998

Eur. Phys. J. C

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An update of the searches for charginos and neutralinos in DELPHI is presented, based mainly on recent data collected at centre-of-mass energies of 161 GeV and 172 GeV. No signal is found. For a sneutrino with mass above 300 GeV/c 2 and a mass dierence between the chargino and the lightest neutralino above 10 GeV/c 2 , the lower limit at 95% condence level on the chargino mass ranges from 84.3 GeV/c 2 to the kinematical limit (86.0 GeV/c 2 ), depending on the mixing parameters. The limit decreases for lower chargino-neutralino mass dierences. The limit in the case of a light sneutrino is 67.6 GeV/c 2 , provided that that there is no light sneutrino with a mass within 10 GeV=c 2 below the chargino mass. Upper limits on neutralino pair production cross-sections of about a picobarn are derived. The (; M 2 ) domain excluded in the MSSM-GUT scenario is determined by combining the neutralino and chargino searches. These results imply a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 24.9 GeV/c 2 for tan 1. The search has also been extended to the case where the lightest neutralino is unstable and decays into a photon and a gravitino.

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Search for neutralinos in Z decays

Cited by 47 publications

References 46 publications

Production and decay of neutralinos in the Next-to-Minimal Supersymmetric Standard Model

Production and decay of neutralinos in the Next-to-Minimal Supersymmetric Standard Model

Supersymmetric scenarios with dominant radiative neutralino decay

Search for charginos, neutralinos and gravitinos at LEP

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