Shigeki Matsumoto (IPMU). Studying Very Light Gravitino at ILC. Collaborators: T . Moroi ( Tokyo ) [for basic idea: arXiv:1104.3624] & K. Fujii (KEK), T. Moroi (Tokyo), T. Suehara (ICEPP) [for realistic evaluations.].
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T. Moroi (Tokyo) [for basic idea: arXiv:1104.3624]
K. Fujii (KEK), T. Moroi (Tokyo), T. Suehara (ICEPP)
[for realistic evaluations.]
Q. Is it possible to study the property of the very light gravitino (～ O(10) eV) at the ILC?
Gravitino = Super partner of Graviton! Its spin is 3/2!
Gravitino Mass = <F>/Mpl/31/2, & <F> = SUSY breaking scale!
Its interactions are suppressed by 1/<F> ～ 1/(Mpl m3/2)
Structure Formation of Universe
LEP, SN cooling
T. Moroi, hep-ph/9503210
Very Light Gravitino, whose mass is O(1)-O(10) eV, is quite attractive from the viewpoint of Cosmology!
100% efficiency for tagging and no contamination assumed.
(Evis = Total energy of charged particles.)
To reduce gg-BG. Tagging forward e± will also be useful.
(q = Scattering angle of the t-jet.)
t, W, and Z in BG are likely to be produced with high rapidity.
(f = Azimuthal angle of the t-jet.)
(L-lim.) Two ts in [tt-BG] are almost back-to-back even w/ ISR.
(U-lim.) To reduce t leptons from the Z boson decay.
( is the momentum of isolated g (> 30 GeV))
Two ts and isolated g in [tt-BG] should be on one plane.
Stau Mass = 120 GeV
Luminosity = 100 fb-1
CM Energy = 500 GeV
It is possible to study the lightgravitino
with the mass of O(10) eV at the ILC.
When the lifetime is longer than ～10-14
sec, the lifetime can measured accurately.
Information of the lifetime translated to
the scale of the SUSY breaking <F>.
CME = 500 GeV
Lum = 100 fb-1
Stau Mass = 120 GeV
Go to a full simulation with realistic detector setup.