Multiplicity with a Thrust Cut

Details Multiplicity with a Thrust Cut Multiplicity with a Thrust Cut

1993-12-28

arxiv.org/abs/hep-ph/9312346v1

Z.Phys. C62 (1994) 471-480

Physics

High Energy Physics

High Energy Physics - Phenomenology

OCHA-PP-32, LATEX FILE, 21p

Scientific paper

10.1007/BF01555906

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

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