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Higgs production in e and real gamma collision
Ken Sasaki
(Yokohama National U.)

In collaboration with

H. Watanabe (KEK) Y. Kurihara (KEK) T. Uematsu (Kyoto U.)
QFThep 2013, June 29, Saint Petersburg Area, Russia




Outline
1. 2. 3. 4. 5. 6. Introduction motivations Higgs production in e and real collision in SM Two-photon and Z-photon fusion diagrams W-related and Z-related diagrams Numerical analysis Summary

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1. Introduction and motivations
l A Higgs particle was found at the LHC
Is it the SM Higgs boson , a SUSY Higgs boson, a Higgs boson of a different model?

l Future linear collider :
ь ь collider:

ILC

might be constructed in Japan ???

l Before e+ beams are ready,
other options are possible:
ь

ь

an an

option option use one e- beam to produce high energy photons
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2 Higgs production in e- and real collision in SM
ь Higgs are produced by loop diagrams

an example

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3. Two-photon and Z-photon fusion diagrams
Calculation is done in unitary gauge

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3. Two-photon and Z-photon fusion diagrams
" Contribution of two-photon fusion diagrams
ь Top quark loops:

ь W boson loops:

: expressed as a linear combination of

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3. Two-photon and Z-photon fusion diagrams
" Contribution of Z-photon fusion diagrams
ь Top quark loops:

ь W boson loops:

The contribution of two-photon and Z-photon fusion diagrams have the same transition form factors



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4. W-related and Z-related diagrams
ь GRACE gives other contributions to Higgs production in ecollision

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4. W-related and Z-related diagrams

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4. W-related and Z-related diagrams
" Contribution of W-related diagrams

where and expressed as a linear combination of

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4. W-related and Z-related diagrams
" Contribution of Z-related diagrams

where and : expressed as a linear combination of

l Collinear divergences appear in but they are cancel out when they are added 11/27


5. Numerical analysis
A preliminary numerical analysis has been done, but we need a more detailed analysis
Since a photon beam has a energy band, we examine a missing energy spectrum

Main background
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5. Numerical analysis
Preliminary

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5. Numerical analysis
" A background is too large We need to consider Higgs decay channels, for an example, detection of the final states with

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6. Summary
ь Higgs production in collision was investigated in SM. ь The EW one-loop contributions to the amplitude were obtained in analytical form. ь A preliminary numerical analysis was performed for the cross section vs missing energy. ь A more detailed analysis for this Higgs production process is necessary.

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Thank you

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