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Title: Case for an EeV Gravitino

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 119; Journal Issue: 5; Related Information: CHORUS Timestamp: 2017-07-31 22:10:00; Journal ID: ISSN 0031-9007
American Physical Society
Country of Publication:
United States

Citation Formats

Dudas, Emilian, Mambrini, Yann, and Olive, Keith A. Case for an EeV Gravitino. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.119.051801.
Dudas, Emilian, Mambrini, Yann, & Olive, Keith A. Case for an EeV Gravitino. United States. doi:10.1103/PhysRevLett.119.051801.
Dudas, Emilian, Mambrini, Yann, and Olive, Keith A. 2017. "Case for an EeV Gravitino". United States. doi:10.1103/PhysRevLett.119.051801.
title = {Case for an EeV Gravitino},
author = {Dudas, Emilian and Mambrini, Yann and Olive, Keith A.},
abstractNote = {},
doi = {10.1103/PhysRevLett.119.051801},
journal = {Physical Review Letters},
number = 5,
volume = 119,
place = {United States},
year = 2017,
month = 7

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on July 31, 2018
Publisher's Accepted Manuscript

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  • A lower bound of 5.4{times}10{sup {minus}16} is shown to follow on the gravitino-photino mass ratio from the observed lack of occurrence of the processes {ital e}{sup +}{ital e}{sup {minus}}{r arrow}{gamma}{ital S},{gamma}{ital P}, where {ital S} and {ital P} are the nearly massless chiral scalar and pseudoscalar, respectively. For a large class of theories with unified gaugino masses, this is convertible into a lower limit of 6.5{times}10{sup {minus}15} GeV on the gravitino mass.
  • Supergravity theories with a superlight gravitino (of mass {similar to}{ital m}{sub {ital W}}{sup 2}{ital M}{sub Pl}{sup {minus}1}) are shown to give rise to monojet and dijet events with large missing {ital p}{sub {ital T}} which should be observable at the Fermilab Tevatron collider. For a gluino mass less than 200 GeV, the signal is much bigger than expected from the standard model or the usual supergravity theory. The observation of such events will thus be a clear signal of supersymmetry.
  • The interesting possibility of observing a superlight gravitino in photon-photon collisions has been pointed out recently. A complete analysis is done of that problem taking into full account the contributions from superlight chiral scalar and pseudoscalar hidden-sector particles which couple gravitationally. The order of magnitude of the cross section is the same as that in the earlier work.
  • If supersymmetry is dynamically broken at a low scale ({ital M}{sub SUSY}), within a few orders of magnitude of the weak scale, then the lightest supersymmetric partner is the gravitino and the next-to-lightest supersymmetric partner is a neutralino {chi}{sup 0}{sub 1} with mass {ital m}{sub {chi}{sup 0}{sub 1}}, which can decay into a photon ({gamma}) plus a gravitino ({tilde {ital G}}). We study the detection of {ital e}{sup {minus}}{ital e}{sup +}{r_arrow}{chi}{sup 0}{sub 1}{chi}{sup 0}{sub 1}{r_arrow}{gamma}{tilde {ital G}}{gamma}{tilde {ital G}} at the proposed Linear Collider, and find the range of the parameters {ital M}{sub SUSY} and {ital m}{sub {chi}{sup 0}{sub 1}}more » that can be accessible with a right-hand polarized electron beam at {radical}{ital S}=500 GeV, with 50 fb{sup {minus}1} integrated luminosity. We also discuss briefly the accessible range for current electron and hadron colliders. {copyright} {ital 1996 The American Physical Society.}« less
  • We analyze the prospects for discovering supersymmetry at the Fermilab Tevatron and CERN LEP colliders in the scenario that the lightest supersymmetric particle is a gravitino of mass {approx_lt}1 keV. We consider in particular the case that the lightest neutralino has a nearly 100{percent} branching fraction into gravitino+photon within the detector. This implies that supersymmetric events should contain both missing (transverse) energy and two energetic photons. Therefore, one can search for supersymmetry simply through inclusive production of superpartners. We consider the exclusion and reach capabilities of the Tevatron in exploring the supersymmetric parameter space, and study the efficiencies which canmore » be achieved in this search. We also consider the discovery reach and backgrounds at LEP with {radical}{ital s}=160, 175, and 190 GeV. {copyright} {ital 1996 The American Physical Society.}« less