Report on New Physics Subgroup Activities Masaki Asano (Tohoku U.) The 9th general meeting of the ILC physics working group Sorry, we have no progress.

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Presentation transcript:

Report on New Physics Subgroup Activities Masaki Asano (Tohoku U.) The 9th general meeting of the ILC physics working group Sorry, we have no progress. This is a quick review of our plan.

How to distinguish the dark matter nature in different new physics ILC ? To distinguish the dark matter nature, We concentrate on this process: Charged new particleDark matter

arXiv: Eri Asakawa, Masaki Asano, Keisuke Fujii, Tomonori Kusano, Shigeki Matsumoto, Rei Sasaki, Yosuke Takubo, and Hitoshi Yamamoto

How to distinguish the dark matter nature in different new physics ILC ? To distinguish the dark matter nature, We concentrate on this process: Charged new particleDark matter

Charged new particleDM Properties of DM & associated charged particle in new physics models. We study in these three cases.

Our Plan (Next Step) Full 500 GeV ILC Quick 1 TeV ILC 1. We will Because we have already prepared for 500GeV in full simulation. M DM = 43.7 GeV M +- = 230 GeV 2. We choice these sample point M DM = 81.9 GeV M +- = GeV 1 TeV ILC This relation is consistent with three new physics models.

Simulation studies Masses – > mass relation between X 0 & X +- Cross section Angular distribution of charged particles – > spin W +- polarization – > the decay vertex structure How accurately can ILC measure

9 Production angle of W H ± Angular distribution of jets from W ± Other parameters W H is spin 1 particle! The dominance of the longitudinal mode! The coupling arises from EWSB!

10 e-e- e+e+ WH+WH+ W+W+ AHAH WH-WH- AHAH W-W- W H ± candidates are reconstructed as corn around W ±. If W H + and W H - are assumed as back-to-back, there are 2 solutions for W H ± candidates. In this mode, however, 2 solutions should be close to true W H ±. W+W+ W-W- WH+WH+ WH-WH- Distribution of production angles of W H +  Production angle of W H ± spin-1 This shape shows W H ± spin as spin-1. Angular distribution of jets W+W+ j1j1 j2j2  j1j1 j2j2 longitudinal W ± helicity as longitudinal mode. Angular distribution of jets in the helicity-frame of the W ± carries information on the polarization of the W ±.

11 Production angle of W H ± Angular distribution of jets from W ± Other parameters W H is spin 1 particle! The dominance of the longitudinal mode! The coupling arises from EWSB! Beam polarization W H has SU(2) L charge, but no U(1) Y charge! 100% RH polarization

N. Okada

13 Other parameters Cross section Heavy lepton 1 TeV 500 GeV ILC Heavy lepton masses depend on Yukawa k_l. k_l can be determined with 22.1% accuracy at 500 GeV, 0.5% accuracy at 1 TeV.

Advanced study In these models, there are t-channel process. If the t-channel process is significant big FB asymmetry. Ex. LHT -> W charge ID N. Okada

From N. Okada’s slides. Backup

N. Okada