Multiplicity with a Thrust Cut
نویسنده
چکیده
We evaluate the multiplicity of hadrons in the e+e−-annihilation at a given thrust T in the modified leading-log approximation, including O( √ αs) corrections. The calculation is done at a large value of τ = 1−T by the use of the factorisation which takes place in the one-particle-inclusive cross section at a given τ . At a small τ , a different type of factorisation takes place, which also enable us to evaluate the multiplicity. Two approaches are compared numerically. Measuring this quantity near τ = 1/3, we can determine the multiplicity ratio between a gluon-jet and a quark-jet.
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