Pair production of the lightest chargino at γγ-collider
Abstract
Chargino pair production via photon-photon collision is investigated in the Minimal Supersymmetric Standard Model at a future linear collider. The process is computed using all the possible diagrams at the next-to-leading order, including box, triangle, and self-energy diagrams. The numerical analysis is carried out for the production rates of the lightest chargino pair in RNS, NS, mSUGRA, BB, and NUGM scenarios. These distinct benchmark models were introduced in the light of the LHC results presented at √{ s } = 7- 8 TeV. Among these scenarios, the RNS has the highest production rate for the γγ → χ∼1+ χ∼1-. The partonic cross section reaches up to 3.94 pb at √{ s ˆ } = 310 GeV. The total convoluted cross section with the photon luminosity in a e+e- machine is calculated as a function of the center-of-mass energy up to 1 TeV. The convoluted cross section is ∼ 1.05 pb at √{ s } = 350 GeV depending on the polarization of the initial electron and laser polarization. The RNS along with the BB scenarios are accessible at √{ s } = 500 GeV with a γγ collision mode on e+e--collider.
Radiatively driven natural Susy (RNS),</ce:para> Natural Susy and mSUGRA/CMSSM scenario,</ce:para> Brummer Buchmuller (BB) benchmark point,</ce:para> Non-universal gaugino masses (NUGM) scenario.</ce:para> It should be emphasized that these scenarios and benchmark points are outside of the limits obtained by the LHC so far because the masses of the squarks and the sleptons are specifically arranged to be above the TeV scale. The masses of the lightest neutralino and the chargino are deliberately set below TeV range which makes them accessible at the Future Lepton Colliders (FLC) particularly in γγ-collisions. The potentials of the FLCs and the γγ-collider can be seen in these benchmark models about the supersymmetry searches. In this study, the cross section of the lightest chargino pair is calculated as a function of the center-of-mass (c.m.) energy. Also, the distributions for the total cross section integrated with the photon luminosity in a e+e--collider are discussed.</ce:para>The content is organized as follows: In Sec. 2, the chargino sector in the MSSM is given briefly. In Sec. 3, the one loop Feynman diagrams, the radiative corrections, and the convolution of the cross section in a e+e- machine are presented. The stabilization of infrared and ultraviolet divergences are discussed. In Sec. 4, numerical results of the total cross section for each of the benchmark points are delivered. At last, the conclusion is drawn in Sec. 5.</ce:para>- Publication:
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Nuclear Physics B
- Pub Date:
- February 2019
- DOI:
- 10.1016/j.nuclphysb.2018.12.019
- arXiv:
- arXiv:1805.06281
- Bibcode:
- 2019NuPhB.939..233S
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- 14 pages, 12 figures