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Overview of Options

2005/7/11. Overview of Options. Eri Asakawa YITP, Kyoto Univ. Intoduction γγ e-γ, e+γ e-e- e+ polarization fixed target Summary. 1. Introduction. LHC will start operation in 2007. After several years operation, it should reveal what LHC seemed to find. Nothing A light Higgs only

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Overview of Options

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  1. 2005/7/11 Overview of Options Eri Asakawa YITP, Kyoto Univ. • Intoduction • γγ • e-γ, e+γ • e-e- • e+ polarization • fixed target • Summary

  2. 1. Introduction LHC will start operation in 2007. After several years operation, it should reveal what LHC seemed to find. • Nothing • A light Higgs only • A heavy Higgs only • Many new particles and/or non-SM phenomena • What kinds of tasks is LC expected to perform in each case ? Search something? Precise measurement? • What roles can options play among the tasks ?

  3. a.Nothing New charged particle search in γγ, eγ exotics search in e-e- EWPT in e+ pol., e-e-,γγ, eγ b. A light Higgs only Γ(h→γγ) measurement in γγ heavy Higgs search in γγ c. A heavy Higgs only EWPT in e+ pol., e-e-, γγ, eγ heavy Higgs factory in γγ d. Many new particles and/or non-SM phenomena PT for new particles in γγ, eγ, e-e- heavy Higgs search in γγ (in the case that new particles = sparticles, but h only) PT for scalar electron in e-e- (in the case that new particles = sparticles)

  4. 2. γγ collision In order to realize γγ option, e-e- mode is necessary and eγ option can be realized at the same time. Therefore, the question “Do we really need options?” may be rephrased “Do we really need γγoption?”. Advantage : beam polarization (circular and linear) large cross sections for charged particle production Disadvantage : less luminosity not-well-defined energy of initial state ・・・

  5. heavy H, A searchb, c (,d) Asner, Gronberg, Gunion (01) Asner et. al. (02) type Ⅱ Ⅰ

  6. b, c, d t, b, W, ‥‥ It is possible to determine Littlest Higgs model MSSM and 2HDM Ginzburg, Krawczyk, Osland(99) Han, Logan, McElrath, L.T. Wang (03)

  7. b, c, d E.A., Kamoshita, Sugamoto, Watanabe (99) E.A., S.Y. Choi, Hagiwara, J.S. Lee (00) Godbole, Rindani, Singh (02) E.A., Hagiwara (03) S.Y. Choi, Kalinowski, Liao, Zerwas (04) J. Ellis, J.S. Lee, Pilaftsis (04) • Amplitude in helicity basis • Amplitude in linear pol. basis signal background In general, mixing between H and A can be considered: where we use

  8. : CPV observables Various observables which are sensitive to CP property of Φ can be obtained by using rich variation of polarizations.

  9. Remarks • Linear pol. can use effectively only for light Higgs bosons • To probe CP mixing in the Higgs mass eigenstate (indirect CPV) • γγ option is powerful because both H and A have finite couplings to γγ.

  10. 3. γ collision a, c, d Advantages: less background beam polarization ・ ・ ・

  11. 4. collision a, b, c, d Advantages: less background beam polarization peculiar initial state quantum numbers ・・・ Disadvantages: less luminosity

  12. selectron productiond J.Feng, Peskin(01) H.C.Cheng, J.Feng, Polonsky (97) Hikasa,Nakamura(95), Nojiri,Fujii,Tsukamoto(96) H.C.Cheng, J.Feng, Polonsky (97) Katz,Randall,S.Su(98), Nojiri,Pierce,Yamada(97) Kiyoura,Nojiri,Pierce,Yamada(98)

  13. 5. polarization in collision Moortgat-Pick et al. (2005) a, c

  14. 6. fixed target LFV in Higgs coupling Kanemura, Kuno, Kuze, Ota (2004) CTEQ6L For E > 60 GeV, the cross section is enhanced due to the sub-process of Higgs mediation with sea b-quarks • Non-observation of the signal • (high-energy muons) • would improve the current limit by 10^4.

  15. 7. Summary It is certain that the options extend physics possible to probe. a.Nothing New charged particle search in γγ, eγ exotics search in e-e- EWPT in e+ pol., e-e-,γγ, eγ b. A light Higgs only Γ(h→γγ) measurement in γγ heavy Higgs search in γγ c. A heavy Higgs only EWPT in e+ pol., e-e-, γγ, eγ heavy Higgs factory in γγ d. Many new particles and/or non-SM phenomena PT for new particles in γγ, eγ, e-e- heavy Higgs search in γγ (in the case that new particles = sparticles, but h only) PT for scalar electron in e-e- (in the case that new particles = sparticles)

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