Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Higgs Physics at a \gamma \gamma Collider   High precision measurements of electroweak observables at $e^\pm$ colliders
indicate the existence of a light Higgs boson below the $W^\pm$ threshold. If
such a fundamental scalar should be found in the near future it is important to
fully investigate the electroweak symmetry braking sector of the Standard
Model. This is particularly important for an intermediate mass Higgs as its
existence might indicate physics beyond the Standard Model, for instance in
form of its minimal supersymmetric extension (MSSM). In this work we present
first results on the expected precision of the partial $\Gamma (H
\longrightarrow \gamma \gamma)$ width at the $\gamma \gamma$ option of a future
linear collider. This quantity is sensitive to new physics as heavy particles
do not decouple in general and differences between the SM and MSSM predictions
can differ by up to 10% even in the decoupling limit of large pseudoscalar
Higgs masses. This regime is difficult and for some values of $\tan \beta$
impossible to cover at the LHC. We find that the well understood background
process $\gamma \gamma \longrightarrow q \bar{q}$ allows for a ${\cal O} (2%)$
determination of $\Gamma (H \longrightarrow \gamma \gamma)$ using conservative
collider parameters.

13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin