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Resonant signatures of Universal Extra Dimension model at LC

Resonant signatures of Universal Extra Dimension model at LC. Shigeki Matsumoto (KEK, Theory). Plan of my talk Minimal UED model LKP dark matter and its thermal relic abundance Resonant signature of UED at LC. M.Kakizaki, SM, Y.Sato, M.Senami : Phys.Rev.D71 (2005)

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Resonant signatures of Universal Extra Dimension model at LC

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  1. Resonant signatures of Universal Extra Dimension model at LC Shigeki Matsumoto (KEK, Theory) • Plan of my talk • Minimal UED model • LKP dark matter and its thermal relic abundance • Resonant signature of UED at LC M.Kakizaki, SM, Y.Sato, M.Senami : Phys.Rev.D71 (2005) M.Kakizaki, SM, Y.Sato, M.Senami : to appear K.Fujii,M.Kakizaki, SM, N.Okada, T.Yamashita : to appear

  2. TeV-scale extra dimension model UED postulates Minimal UED model all SM particles propagate a compact spatial extra dimension. From a 4-dim point of view, UED contains Minimal setup M4×S1/Z2 SM particles and their KK-modes (gauge) γ, W, Z, γ(n), W(n), Z(n) (lepton) Li, Ei Li(n), Ei(n) (quark) Qi, Ui, Di Qi(n), Ui(n), Di(n) (higgs) h H(n) nth-KK particles m ~ n/R R 1 2 I. Compactification scale R is constrained by LEP (1/R > 300 GeV) II. Z2-orbifolding is required for produsing the chiral fermion at 0-mode. UED has KK-parity [+(-) for even (odd) n] (momentum conservation of 5th dim.) I. The lightest KK particle (LKP) is stable. Dark matter candidate II. Single KK particle (odd n) cannot be produced.

  3. Spectrum of 1st KK modes All interactions in UED are determined by those in SM. No CP & Flavor problems UED has only two new-physics parameters. R: Size of extra dimension, Λ：Cutoff scale 1st KK spectrum The spectrum of 1st KK modes in the model is very similar to that of super-particles in MSSM (mSUGRA). 1/R = 500 GeV ΛR = 20 Kinematics are essentially same !! It is difficult to distinguish between these two models at LHC. We need a lepton collider such as ILC. if UED is actually realized

  4. γ(1) IS LKP. Thermal relic abundance of LKP dark matter Important quantity : 1/R It determines masses of KKs. Calculation of the abundance of LKP DM gives the information for 1/R. Regions consistent with WMAP observation 1/R ~ 600 GeV 1/R GeV 1/R GeV In the calculation, only co-annihilation processes between γ(1) and Ei(1). However, when we consider other co-annihilation processes between γ(1), W(1), Z(1), Li(1), Ei(1) and H(1), the scale 1/R consistent with WMAP may be 1/R < 500 GeV !!.

  5. Resonant signatures of UED What is a difference? UED has a structure similar to SUSY models I.∃higher KK modes, II. Difference of spins between 1st KKs & Super-particles There are resonances originated from these differences !! (The resonances does not appear in supersymmetric models.) II. I. B(1) e+ q(1) e+ L(1) q γ Z(2) q e- q(1) B(1) e- L(1) 1-loop quakonium

  6. Cross section of resonances e+e- b(1)b(1) bb + E e+e- Z(2)  μ+μ- + E (pb) (pb) 1/R = 400 (GeV) ΛR = 20 1/R = 400 (GeV) ΛR = 20 1 10 0.1 1 0.01 0.1 930 854 935 846 850 (GeV) (GeV) We can distinguish UED from MSSM by using resonances. We can determines model parameters such as R &Λ. 1/R  Overall locations of resonances, Λ Relative distance between the locations, their widths

  7. Summary • The spectrum of 1st KK modes are similar to that of super-particles in MSSM.  difficult to distinguish in LHC • UED has some resonances originated from the spin of 1st KKs and ∃higher-KKs. • Using the resonances, we can distinguish UED from MSSM, and determine model parameters precisly. Future directions • Investigating how precisely the model parameters are determined by using resonances after considering the energy resolution of colliders, performance for tagging particles, and so on.

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