On the muon anomalous magnetic moment in models with a superlight gravitino

Brignole, Andrea; Perazzi, Elena; Zwirner, Fabio

doi:10.1088/1126-6708/1999/09/002

Cited by 22 publications

(30 citation statements)

References 18 publications

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“…Ref. [58] examined models with a superlight gravitino. Detailed studies of a SUSY µ were carried out in models constrained by various assumptions on the SUSY-breaking mechanism: gauge-mediated [59,60], SUGRA [61,62,63], and anomaly-mediated [64].…”

Section: Supersymmetrymentioning

confidence: 99%

Muon anomalous magnetic moment: A harbinger for “new physics”

2001

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QED, Hadronic, and Electroweak Standard Model contributions to the muon anomalous magnetic moment, a µ ≡ (g µ − 2)/2, and their theoretical uncertainties are scrutinized. The status and implications of the recently reported 2.6 sigma experiment vs. theory deviation a exp µ − a SM µ = 426(165) × 10 −11 are discussed. Possible explanations due to supersymmetric loop effects with m SUSY ≃ 55 √ tan β GeV, radiative mass mechanisms at the 1-2 TeV scale and other "New Physics" scenarios are examined.

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Section: Supersymmetrymentioning

confidence: 99%

Muon anomalous magnetic moment: A harbinger for “new physics”

2001

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“…Presumably the possibility of muon substructure can be immediately disfavored as effects would already have been observed in processes involving more highly energetic muons at LEP, HERA, and the Tevatron. Effects on g µ −2 have been studied in extensions of the Standard Model such as low energy supersymmetry (SUSY) [3][4][5][6][7][8][9] or (TeV) −1 scale extra dimensions [10,11]. However, it has been argued [10] that the effects due to large extra dimensions are generally small compared to possible effects within SUSY models for typical parameter ranges.…”

Section: Introductionmentioning

confidence: 99%

Implications of Muong−2for Supersymmetry and for Discovering Superpartners Directly

et al. 2001

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We study the implications of interpreting the recent muon gµ −2 deviation from the Standard Model prediction as evidence for virtual superpartners, with very general calculations that include effects of phases and are consistent with all relevant constraints. Assuming the central value is confirmed with smaller errors, there are upper limits on masses: at least one superpartner mass is below about 350 GeV (for the theoretically preferred value of tan β = 35) and may be produced at the Fermilab Tevatron in the upcoming run, and there must be chargino, neutralino, and slepton masses below about 600 GeV. In addition, tan β must be larger than about 8.

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“…We start from the effective Lagrangian in four-component notation for the single interaction of a light gravitino [3,17,32,33], whose longitudinal (spin-1/2) goldstino components [2] can couple to the matter and gauge supermultiplets with enhanced (electroweak) strength [1]. The corresponding effective Lagrangian in two-component notation can be found in [14,34,35,36,37,38,39,40], while interactions involving several external goldstinos or goldstino propagators and the scalar/pseudo-scalar superpartners of the goldstinos, the socalled sgoldstinos, have been derived in four-component notation, e.g., in [33,41].…”

Section: Appendix A: Effective Lagrangian For Single Goldstinosmentioning

confidence: 99%

New results for light gravitinos at hadron colliders: Fermilab Tevatron limits and CERN LHC perspectives

Klasen¹,

Pignol

2007

Phys. Rev. D

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We derive Feynman rules for the interactions of a single gravitino with (s)quarks and gluons/gluinos from an effective supergravity Lagrangian in nonderivative form and use them to calculate the hadroproduction cross sections and decay widths of single gravitinos. We confirm the results obtained previously with a derivative Lagrangian as well as those obtained with the nonderivative Lagrangian in the high-energy limit and elaborate on the connection between gauge independence and the presence of quartic vertices. We perform extensive numerical studies of branching ratios, total cross sections, and transverse-momentum spectra at the Fermilab Tevatron and the CERN LHC. From the latest CDF monojet cross section limit, we derive a new and robust exclusion contour in the gravitino-squark/gluino mass plane, implying that gravitinos with masses below 2 10 ÿ5 to 1 10 ÿ5 eV are excluded for squark/ gluino masses below 200 and 500 GeV, respectively. These limits are complementary to the one obtained by the CDF Collaboration, 1:1 10 ÿ5 eV, under the assumption of infinitely heavy squarks and gluinos. For the LHC, we conclude that supersymmetric scenarios with light gravitinos will lead to a striking monojet signal very quickly after its startup.

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On the muon anomalous magnetic moment in models with a superlight gravitino

Cited by 22 publications

References 18 publications

Muon anomalous magnetic moment: A harbinger for “new physics”

Muon anomalous magnetic moment: A harbinger for “new physics”

Implications of Muong−2for Supersymmetry and for Discovering Superpartners Directly

New results for light gravitinos at hadron colliders: Fermilab Tevatron limits and CERN LHC perspectives

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