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Phenomenology of SUSY Models with Non-universal Sfermions

Explore the theoretical basis and experimental implications of non-universal sfermion masses within Supersymmetry (SUSY) models. Learn how to distinguish non-universal scenarios from universal models at the LHC using tools like ISAJET and HERWIG. Investigate the distinctive features of SUSY processes, b-jet events, and high pT jets in collider experiments. Delve into the significance of sfermion mass distributions and their role in verifying non-universal scenarios in high-energy physics research.

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Phenomenology of SUSY Models with Non-universal Sfermions

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  1. Phenomenology of SUSY Models with Non-universal Sfermions Kazuki Sakurai (Nagoya U.  KEK Cambridge U.) In collaboration with S.-G. Kim, N.Maekawa, K.I.Nagao, M.M.Nojiri, Y.Shimizu, M.Takeuchi 2009/3/9　フレーバー物理の新展開@ 蒲郡

  2. Introduction SUSY is one of the promising candidates of Physics beyond the SM However MSSM has many parameters ( > 100 !!) Gauginos : Scalar fermion: (Sfermion)

  3. Introduction SUSY is one of the promising candidates of Physics beyond the SM However MSSM has many parameters ( > 100 !!) We can deduce parameters Gauginos : Scalar fermion: (Sfermion)

  4. Introduction SUSY is one of the promising candidates of Physics beyond the SM However MSSM has many parameters ( > 100 !!) We can deduce parameters SU(5) GUT: Gauginos : Scalar fermion: (Sfermion)

  5. Introduction SUSY is one of the promising candidates of Physics beyond the SM However MSSM has many parameters ( > 100 !!) We can deduce parameters SU(5) GUT: Gauginos : Scalar fermion: (Sfermion)

  6. Introduction SUSY is one of the promising candidates of Physics beyond the SM However MSSM has many parameters ( > 100 !!) We can deduce parameters SU(5) GUT: Gauginos : Scalar fermion: (Sfermion)

  7. Introduction SUSY is one of the promising candidates of Physics beyond the SM However MSSM has many parameters ( > 100 !!) We can deduce parameters SU(5) GUT: Gauginos : Scalar fermion: (Sfermion) (at GUT scale)

  8. Non-Universal Sfermion Masses Can we deduce more ? ？ ？ ？

  9. Non-Universal Sfermion Masses Can we deduce more ? ？ fromFCNCsandEDMs: Degenerate and heavy Sfermion K0-K0bar mixing neutron EDM

  10. Non-Universal Sfermion Masses Can we deduce more ? ？ fromFCNCsandEDMs: Degenerate and heavy Sfermion K0-K0bar mixing neutron EDM

  11. Non-Universal Sfermion Masses Can we deduce more ? ？ fromNaturalness:

  12. Non-Universal Sfermion Masses Can we deduce more ? ？ fromNaturalness: Light stops and gaugino R.Dermisek, H.D.Kim, I.W. Kim ‘00

  13. Non-Universal Sfermion Masses Can we deduce more ? fromNaturalness: Light stops and gaugino R.Dermisek, H.D.Kim, I.W. Kim ‘00

  14. Non-Universal Sfermion Masses Theoretically motivated (E6 SUSY GUT with Horizontal symmetry) N.Maekawa ‘02, ‘04, N.Maekawa, T.Yamashita ‘04

  15. Non-Universal Sfermion Masses Theoretically motivated (E6 SUSY GUT with Horizontal symmetry) N.Maekawa ‘02, ‘04, N.Maekawa, T.Yamashita ‘04 How can we check this non-universal scenario at the LHC ? ISAJET: for particle spectrum HERWIG: for event generation AcerDET: for detector simulation

  16. Model Point &Collider Signature Point A: Dominant SUSY processes @LHC LSP

  17. Model Point &Collider Signature Point A: Dominant SUSY processes @LHC Very high momentum jet many b-jets LSP We will see “a very high pT jet” and “many b jets”at LHC !!

  18. Number of b-jets “4”b-jets in an event LSP

  19. Number of b-jets Hinchliff, et al. ’97, ATLAS collaboration ‘99 “4”b-jets in an event --- Cut --- SUSY cut: Events/1fb-1 b-tagging efficiency = 60% # of b-tagged jets LSP # of b jets is smeared by ξ(b)=60% , but we can see many b jets in an event

  20. Comparison with famous Univ. Points “Non-universal” Point A Small number of “0” b-jet events is characteristic of this scenario!! Events/1fb-1 “Universal” Famous model points SPS1a SPS2 SPS3 SPS4 SPS5 SPS6 SPS8 SPS9

  21. Comparison with famous Univ. Points “Non-universal” Point A Small number of “0” b-jet events is characteristic of this scenario!! Events/1fb-1 “Universal” Famous model points SPS1a SPS2 SPS3 SPS4 SPS5 SPS6 SPS8 SPS9 We can find that the squarks that are lighter than gluino are only the 3rd generation squarks!

  22. The highest pT jet Very high pT The highest pT in an event (The highest pT is not b) Events/40GeV/1fb-1 pT(max) LSP

  23. The highest pT jet Very high pT The highest pT in an event (The highest pT is not b) Events/40GeV/1fb-1 pT(max) LSP

  24. The highest pT jet Very high pT The highest pT in an event (The highest pT is not b) Events/40GeV/1fb-1 pT(max) LSP

  25. The highest pT jet can “not” be b-tagged Very high pT The highest pT in an event (The highest pT is not b) The highest pT in an event (The highest pT is b-tagged) Events/40GeV/1fb-1 Events/40GeV/1fb-1 pT(max) We can eliminate the very high pT quark jet by using b-tagging Difference between two figures tells us the 1st and 2nd generation squarks are much heaver than gluino!! can be b-tagged LSP pT(max)

  26. Really Non-universal ? From “The # of b-jets distribution” and “The highest pT distribution”, we could demonstrate to distinguish our Non-universal scenario from several Universal model points even in 1 fb-1 at the LHC !!

  27. Really Non-universal ? From “The # of b-jets distribution” and “The highest pT distribution”, we could demonstrate to distinguish our Non-universal scenario from several Universal model points even in 1 fb-1 at the LHC !! But, were we really able to say “We confirmed our non-universal scenario in the LHC simulation”?

  28. Really Non-universal ? From “The # of b-jets distribution” and “The highest pT distribution”, we could demonstrate to distinguish our Non-universal scenario from several Universal model points even in 1 fb-1 at the LHC !! But, were we really able to say “We confirmed our non-universal scenario in the LHC simulation”? --- In Universal scenario --- The highest pT The 1st and 2nd generation squarks are much heavier than gluino possible if we take

  29. Really Non-universal ? From “The # of b-jets distribution” and “The highest pT distribution”, we could demonstrate to distinguish our Non-universal scenario from several Universal model points even in 1 fb-1 at the LHC !! But, were we really able to say “We confirmed our non-universal scenario in the LHC simulation”? --- In Universal scenario --- The highest pT The 1st and 2nd generation squarks are much heavier than gluino possible if we take The # of b-jets possible in large A0 The squarks that are lighter than gluino are only the 3rd generation squarks One of the stops can be very light

  30. Large |A0|, m0 scenario Point U : (Universal in sfermion flavor) Point U

  31. Large |A0|, m0 scenario Point U : (Universal in sfermion flavor) Point U Point U Point U Point U # of b-tagged jets pT(max) (not b) pT(max) (b-tagged) Similar distributions to those of our Non-universal scenario are obtained !

  32. Difference What is a difference between Non-univ. and Large |A0|, m0scenarios ? Non-universal scenario : Large |A0|, m0 scenario : or (～50-70%) (～30-50%) (100%) If gluinosbottom chains can be found in events, we can distinguish theses two scenarios !

  33. Difference What is a difference between Non-univ. and Large |A0|, m0scenarios ? Non-universal scenario : Large |A0|, m0 scenario : or (～50-70%) (～30-50%) (100%) If gluinosbottom chains can be found in events, we can distinguish theses two scenarios ! What is a difference between sbottom and stop chain ? gluino  sbottom chain: gluino  stop chain: Final states are similar, b×2+W×2!! It is not easy to find a difference of these two chains

  34. Difference Focusing on χ20Z mode cannot open due to small m30 Non-universal : Large |A0|, m0 : [～100%] [100%] [0～10%] [50～70%] [0%] [～100%] The number of associate jets is different in χ20Z events !! [30～50%] [10～30%] Non-universal Z with a small number of jets Large |A0|, m0 Z with a large number of jets

  35. Difference Focusing on χ20Z mode cannot open due to small m30 Non-universal : Large |A0|, m0 : [～100%] [100%] [0～10%] [50～70%] [0%] [～100%] The number of associate jets is different in χ20Z events !! [30～50%] [10～30%] Non-universal Z with a small number of jets Large |A0|, m0 Z with a large number of jets

  36. Z boson and # of jets Since these are the only processes to produce Z boson in gl-gl events,if we find a Z boson together with a small number of jets in gl-gl events, we can find that the gluinosbottom chain exists!! We reduce sq-gl events with cut: The highest jet is b-tagged, pT<300GeV In gl-gl events, if we find Non-universal Z and a small number of jets Z and a large number of jets Large |A0|, m0 Point A Z-peak 2 lepton inv. mass (GeV)

  37. Z boson and # of jets Since these are the only processes to produce Z boson in gl-gl events,if we find a Z boson together with a small number of jets in gl-gl events, we can find that the gluinosbottom chain exists!! We reduce sq-gl events with cut: The highest jet is b-tagged, pT<300GeV In gl-gl events, if we find Non-universal Z and a small number of jets Z and a large number of jets Large |A0|, m0 Point A # of jets = 4 We select # of jets in the events (η<2.5, pT>50GeV) 12 Z-peak 2 lepton inv. mass (GeV)

  38. Z boson and # of jets Since these are the only processes to produce Z boson in gl-gl events,if we find a Z boson together with a small number of jets in gl-gl events, we can find that the gluinosbottom chain exists!! # of jets = 5 We reduce sq-gl events with cut: The highest jet is b-tagged, pT<300GeV In gl-gl events, if we find 20 Non-universal Z and a small number of jets Z and a large number of jets Large |A0|, m0 Point A # of jets = 4 We select # of jets in the events (η<2.5, pT>50GeV) 12 Z-peak 2 lepton inv. mass (GeV)

  39. Z boson and # of jets Since these are the only processes to produce Z boson in gl-gl events,if we find a Z boson together with a small number of jets in gl-gl events, we can find that the gluinosbottom chain exists!! # of jets = 5 # of jets = 6 We reduce sq-gl events with cut: The highest jet is b-tagged, pT<300GeV 15 In gl-gl events, if we find 20 Non-universal Z and a small number of jets Z and a large number of jets Large |A0|, m0 Point A # of jets = 4 We select # of jets in the events (η<2.5, pT>50GeV) 12 Z-peak 2 lepton inv. mass (GeV)

  40. Z boson and # of jets Preliminary Point U Point A # of jets = 5 # of jets = 6 15 20 Point A # of jets = 4 We select # of jets in the events (η<2.5, pT>50GeV) 12 Z-peak 2 lepton inv. mass (GeV)

  41. Z boson and # of jets Preliminary Point U Point A # of jets = 5 # of jets = 6 15 20 Point A # of jets = 4 We select # of jets in the events (η<2.5, pT>50GeV) 12 Z-peak By seeing Z-peak events on various jet number cuts, we can distinguish our non-universal scenario from a large |A0|, m0 scenario ! 2 lepton inv. mass (GeV)

  42. Summary • A non-universal scenario (m30,m1/2<<m0) can be distinguished from several universal model points in very early stage in the LHC (Lint～1fb-1) !! • The number of b-jets distribution • The highest pT jet distributions • A large |A0|, m0 scenario produces similar signature to the non-universal scenario, though it has the universal scalar mass. • We can distinguish these two scenario by seeing the Z-peak in various jet number cuts.

  43. Plan • Introduction • Non-universal Sfermions • LHC signature • Summary

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