Abstract
This work investigates the possibility of a long-lived stop squark in supersymmetric models with the neutralino as the lightest supersymmetric particle (LSP). We study the implications of meta-stable stops on the sparticle mass spectra and the dark matter density. We find that in order to obtain a sufficiently long stop lifetime so as to be observable as a stable R-hadron at an LHC experiment, we need to fine tune the mass degeneracy between the stop and the LSP considerably. This increases the stop-neutralino co-anihilation cross section, leaving the neutralino relic density lower than what is expected from the WMAP results for stop masses ≲1.5 TeV/c 2. However, if such scenarios are realised in nature we demonstrate that the long-lived stops will be produced at the LHC and that stop-based R-hadrons with masses up to 1 TeV/c2 can be detected after one year of running at design luminosity.
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G. Gabadadze, Beyond the standard model: Extra dimensions and supersymmetry, prepared for European School on High-Energy Physics, Tsakhkadzor Armenia, 24 Aug - 6 Sep 2003.
L. Bergstrom and P. Gondolo, Limits on direct detection of neutralino dark matter from b → sγ decays, Astropart. Phys. 5 (1996) 263 [hep-ph/9510252] [SPIRES].
T. Sjöstrand, S. Mrenna and P.Z. Skands, PYTHIA 6.4 Physics and Manual, JHEP 05 (2006) 026 [hep-ph/0603175] [SPIRES].
M. Fairbairn et al., Stable massive particles at colliders, Phys. Rept. 438 (2007) 1 [hep-ph/0611040] [SPIRES].
A.R. Raklev, Massive Metastable Charged (S)Particles at the LHC, arXiv:0908.0315 [SPIRES].
A.G. Cohen, D.B. Kaplan and A.E. Nelson, Progress in electroweak baryogenesis, Ann. Rev. Nucl. Part. Sci. 43 (1993) 27 [hep-ph/9302210] [SPIRES].
M.S. Carena and C.E.M. Wagner, Electroweak baryogenesis and Higgs physics, hep-ph/9704347 [SPIRES].
A. Riotto and M. Trodden, Recent progress in baryogenesis, Ann. Rev. Nucl. Part. Sci. 49 (1999) 35 [hep-ph/9901362] [SPIRES].
C. Balázs, M.S. Carena and C.E.M. Wagner, Dark matter, light stops and electroweak baryogenesis, Phys. Rev. D 70 (2004) 015007 [hep-ph/0403224] [SPIRES].
S. Kraml and A.R. Raklev, Same-sign top quarks as signature of light stops at the LHC, Phys. Rev. D 73 (2006) 075002 [hep-ph/0512284] [SPIRES].
B.C. Allanach et al., Les Houches ’Physics at TeV colliders 2005’ Beyond the standard model working group: Summary report, hep-ph/0602198 [SPIRES].
J.L. Feng, A. Rajaraman and F. Takayama, Superweakly-interacting massive particles, Phys. Rev. Lett. 91 (2003) 011302 [hep-ph/0302215] [SPIRES].
J.R. Ellis, K.A. Olive, Y. Santoso and V.C. Spanos, Gravitino dark matter in the CMSSM, Phys. Lett. B 588 (2004) 7 [hep-ph/0312262] [SPIRES].
J.L. Feng, S. Su and F. Takayama, Supergravity with a gravitino LSP, Phys. Rev. D 70 (2004) 075019 [hep-ph/0404231] [SPIRES].
J.L. Diaz-Cruz, J.R. Ellis, K.A. Olive and Y. Santoso, On the feasibility of a stop NLSP in gravitino dark matter scenarios, JHEP 05 (2007) 003 [hep-ph/0701229] [SPIRES].
D. Choudhury, S.K. Gupta and B. Mukhopadhyaya, Right sneutrinos in a supergravity model and the signals of a stable stop at the Large Hadron Collider, Phys. Rev. D 78 (2008) 015023 [arXiv:0804.3560] [SPIRES].
DELPHI collaboration, P. Abreu et al., A search for heavy stable and longlived squarks and sleptons in e + e − collisions at energies from 130-GeV to 183-GeV, Phys. Lett. B 444 (1998) 491 [hep-ex/9811007] [SPIRES].
ALEPH collaboration, A. Heister et al., Search for stable hadronizing squarks and gluinos in e + e − collisions up to \( \sqrt {s} = 209\;GeV \), Eur. Phys. J. C 31 (2003) 327 [hep-ex/0305071] [SPIRES].
DELPHI collaboration, J. Abdallah et al., Search for supersymmetric particles in light gravitino scenarios and sleptons NLSP, Eur. Phys. J. C 27 (2003) 153 [hep-ex/0303025] [SPIRES].
T. Adams, Searches for Long-lived Particles at the Tevatron Collider, Mod. Phys. Lett. A 23 (2008) 371 [arXiv:0802.1048] [SPIRES].
CDF collaboration, T. Aaltonen et al., Search for Long-Lived Massive Charged Particles in 1.96 TeV \( \bar{p}p \) Collisions, Phys. Rev. Lett. 103 (2009) 021802 [arXiv:0902.1266] [SPIRES].
ALICE collaboration, A. Dobrin, Searches for New Physics with the ALICE Experiment in pp Collisions, AIP Conf. Proc. 1200 (2010) 730 [arXiv:0910.0759] [SPIRES].
The ATLAS collaboration, G. Aad et al., Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics, arXiv:0901.0512 [SPIRES].
A.C. Kraan, J.B. Hansen and P. Nevski, Discovery potential of R-hadrons with the ATLAS detector, Eur. Phys. J. C 49 (2007) 623 [hep-ex/0511014] [SPIRES].
L.A. Anchordoqui, A. Delgado, C.A. Garcia Canal and S.J. Sciutto, Hunting long-lived gluinos at the Pierre Auger Observatory, Phys. Rev. D 77 (2008) 023009 [arXiv:0710.0525] [SPIRES].
Pierre Auger collaboration, J. Abraham et al., Properties and performance of the prototype instrument for the Pierre Auger Observatory, Nucl. Instrum. Meth. A 523 (2004) 50 [SPIRES].
J.L. Hewett, B. Lillie, M. Masip and T.G. Rizzo, Signatures of long-lived gluinos in split supersymmetry, JHEP 09 (2004) 070 [hep-ph/0408248] [SPIRES].
S.P. Martin, A Supersymmetry Primer, hep-ph/9709356 [SPIRES].
K.-i. Hikasa and M. Kobayashi, Light Scalar Top at e + e − Colliders, Phys. Rev. D 36 (1987) 724 [SPIRES].
H.P. Nilles, Supersymmetry, Supergravity and Particle Physics, Phys. Rept. 110 (1984) 1 [SPIRES].
J. Edsjo and P. Gondolo, Neutralino Relic Density including Coannihilations, Phys. Rev. D 56 (1997) 1879 [hep-ph/9704361] [SPIRES].
P. Gondolo et al., DarkSUSY: Computing supersymmetric dark matter properties numerically, JCAP 07 (2004) 008 [astro-ph/0406204] [SPIRES].
Particle Data Group collaboration, C. Amsler et al., Review of particle physics, Phys. Lett. B 667 (2008) 1 [SPIRES].
P. Bechtle, O. Brein, S. Heinemeyer, G. Weiglein and K.E. Williams, HiggsBounds: Confronting Arbitrary Higgs Sectors with Exclusion Bounds from LEP and the Tevatron, Comput. Phys. Commun. 181 (2010) 138 [arXiv:0811.4169] [SPIRES].
Heavy Flavor Averaging Group (HFAG) collaboration, E. Barberio et al., Averages of b–hadron properties at the end of 2006, arXiv:0704.3575 [SPIRES].
Muon G-2 collaboration, G.W. Bennett et al., Final report of the muon E821 anomalous magnetic moment measurement at BNL, Phys. Rev. D 73 (2006) 072003 [hep-ex/0602035] [SPIRES].
WMAP collaboration, E. Komatsu et al., Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation, Astrophys. J. Suppl. 180 (2009) 330 [arXiv:0803.0547] [SPIRES].
B. Allanach et al., SUSY Les Houches Accord 2, Comp. Phys. Commun. 180 (2009) 8 [arXiv:0801.0045] [SPIRES].
M. Muhlleitner, A. Djouadi and Y. Mambrini, SDECAY: A Fortran code for the decays of the supersymmetric particles in the MSSM, Comput. Phys. Commun. 168 (2005) 46 [hep-ph/0311167] [SPIRES].
M. Muehlleitner, private communication.
CDF collaboration, T. Aaltonen et al., Search for Long-Lived Massive Charged Particles in 1.96 TeV \( \bar{p}p \) Collisions, Phys. Rev. Lett. 103 (2009) 021802 [arXiv:0902.1266] [SPIRES].
S. Dawson, E. Eichten and C. Quigg, Search for Supersymmetric Particles in Hadron - Hadron Collisions, Phys. Rev. D 31 (1985) 1581 [SPIRES].
A.C. Kraan, Interactions of heavy stable hadronizing particles, Eur. Phys. J. C 37 (2004) 91 [hep-ex/0404001] [SPIRES].
Y.R. de Boer, A.B. Kaidalov, D.A. Milstead and O.I. Piskounova, Interactions of Heavy Hadrons usingRegge Phenomenology and the Quark Gluon String Model, J. Phys. G 35 (2008) 075009 [arXiv:0710.3930] [SPIRES].
R. Mackeprang and A. Rizzi, Interactions of coloured heavy stable particles in matter, Eur. Phys. J. C 50 (2007) 353 [hep-ph/0612161] [SPIRES].
R. Mackeprang and D. Milstead, An Updated Description of Heavy-Hadron Interactions, Eur. Phys. J. C 66 (2010) 493 [arXiv:0908.1868] [SPIRES].
A. Arbey and F. Mahmoudi, SUSY Constraints, Relic Density and Very Early Universe, JHEP 05 (2010) 051 [arXiv:0906.0368] [SPIRES].
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Johansen, M., Edsjö, J., Hellman, S. et al. Long-lived stops in MSSM scenarios with a neutralino LSP. J. High Energ. Phys. 2010, 5 (2010). https://doi.org/10.1007/JHEP08(2010)005
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DOI: https://doi.org/10.1007/JHEP08(2010)005