Top quark threshold production in γγ collision in the next - to - leading order
نویسندگان
چکیده
Top quark threshold production in γγ collision in the next-to-leading order. Abstract The total cross section of the top quark-antiquark pair production near threshold in γγ collision is computed analytically up to the next-to-leading order in perturbative and nonrelativistic expansion for general photon helicity. The approximation includes the first order corrections in the strong coupling constant and the heavy quark velocity to the nonrelativistic Coulomb approximation.
منابع مشابه
→ tt̄ and γγ → tt̄ observables near the threshold up to the next - to - next - to - leading order of NRQCD
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+ e − → t ¯ t and γγ → t ¯ t observables near the threshold up to the next-to-next-to-leading order of NRQCD. Abstract We present the analytical description of top-antitop pair production near the threshold in e + e − annihilation and γγ collisions. A set of basic observables considered includes the total cross sections, forward-backward asymmetry and top quark polarization. The threshold effec...
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