Flavor Physics from R-parity Violation Eung Jin Chun Korea Institute for Advanced Study ICFP2005,...
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![Page 1: Flavor Physics from R-parity Violation Eung Jin Chun Korea Institute for Advanced Study ICFP2005, NCU, Chung-li, Oct.3-8.](https://reader037.fdocuments.us/reader037/viewer/2022110322/56649d2a5503460f949fefae/html5/thumbnails/1.jpg)
Flavor Physics from R-parity Violation
Eung Jin ChunKorea Institute for Advanced Study
ICFP2005, NCU, Chung-li, Oct.3-8
![Page 2: Flavor Physics from R-parity Violation Eung Jin Chun Korea Institute for Advanced Study ICFP2005, NCU, Chung-li, Oct.3-8.](https://reader037.fdocuments.us/reader037/viewer/2022110322/56649d2a5503460f949fefae/html5/thumbnails/2.jpg)
Flavor physics from RpV
• The MSSM with R-parity violation• Experimental limits/future signals (?)• Collider searches• Neutrino masses and mixing• Conclusions
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The MSSM with R-parity violation
Supersymmetric Standard Model SU(3)xSU(2)xU(1) gauge invariance allows L & B violation
antisymmetric
L & B conserving superpotential
L or B violating superpotential
3 + 6 + 9 + 6 = 18 + 6 parameters
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The MSSM with R-parity violation• L & B violation leads to proton decay
• R-parity: -1 for supersymmetric particles +1 for SM particles Lightest Supersymmetric Particle stable and a good dark matter candidate
Conserves L & B
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The MSSM with R-parity violation• B-parity: -1 for quark superfields
+1 for others LSP destabilized by L violation
Conserves only B
• L-parity: -1 for lepton superfields
+1 for others LSP destabilized by B violation
• String origin of discrete symmetries: anomaly-free condition selects out two possibilities Z2 R-parity & Z3 B-parity
Conserves only L
Ibanez-Ross
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Experimental Limits• B-violation
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Experimental Limits• L-violation
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Experimental Limits• L-violation
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Experimental Limits• L-violation
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Manifestation in B/K physics?• K !
Deshpande, et.al., 04
• B ! puzzle
Oh’s talk
• B ! puzzle
Yang, et.al., 05
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Manifestation in B/K physics?• Wrong-sign K
EJC-Lee, 02
In SM,
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Summary of limits
Single bound
Product bound
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Collider Searches
Single sparticle production and decay : , ’ > 10-3
Sparticle pair production and decay : , ’ < 10-3
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Kamon’s talk at SUSY05
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Kamon’s talk at SUSY05
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Kamon’s talk at SUSY05
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Collider Searches: Bilinear RpV
Neutrino-neutralino / lepton-chargino mixing
Same-sign di-leptons
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Neutrino mass matrix from RpV
• Neutrino-Neutralino mass matrix (7x7)Tree Mass from neutrino-neutralino mixing
One-loop
Neutrino-gaugino mixing
Neutrino-Higgsino mixing
Hepmfling, Romao et.al., Kong et.al, …….
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Neutrino mass matrix from RpV
Tree Mass via weak scale seesaw
Hierarchical neutrino mass
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Neutrino mass matrix from RpV
• Scalar lepton-Higgs mixing by scalar bilinears
• One-loop with, e.g., sneutrino-neutralino exchange
Loop Mass from Bilinears
Vanishes with universality
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Neutrino mass matrix from RpV
• One-loop with sbottom/stau exchange
Loop Mass from Trilinears & Yukawas
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Non-universal SUSY breaking
• Bilinear model with 9 parameters• Free to fit neutrino mass matrix • Tree for Atm. & Loop for Sol.• Test in colliders: LFV decays of LSP measur
e the neutrino mixing angles
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Universal SUSY breaking
GMSB or mSUGRA• Universal soft mass at
high scale• Bilinear model cannot
explain bilarge mixing• Consider 5 trilinear co
uplings • Tree mass through RG
E
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mSUGRA models
• Loop-to-tree mass ratio is too small due to large RGE effect
• Need some tuning to get a mild hierarchy of neutrino mass
• Easy to arrange two large & one small mixing angles
Jung-Kang-Park-EJC,04
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mSUGRA models
General behavior of arbitrary points for neutrino m2 ratio
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mSUGRA models
Fitting the masses and Chooz angle
Fitting two large angles
Ranges of allowed RpV parameters
Measure from LSP decay gap
Check the ratios from LFV decay
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mSUGRA modelsCollider signatures: neutralino LSP
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mSUGRA models
Collider signatures: neutralino LSP
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Conclusions
• B or L violation may exist with SUSY.• It leads to rich flavor structure: only limits at
present.• Still, large RpV is not excluded and thus may
manifest in B/K or collider expts.• Most exciting is the generation of neutrino m
ass matrix requiring small couplings.• By observing the LSP decays at colliders, RpV
neutrino model can be tested.