Exclusive heavy quark dijet cross section

Abstract

We study the exclusive heavy quark dijet cross section from $e^{+}{e}^{-}$-annihilation using soft-collinear effective theory. In order to resum the large logarithms of small jet veto parameter $\beta$ and jet radius $R$, we factorize the cross section into the hard, hard-soft, collinear, and collinear-soft parts. Compared with the case of a massless quark, the jet sector with the collinear and collinear-soft parts can be modified to include the heavy quark mass. The factorization of the jet sector can be systematically achieved through matching onto the boosted heavy quark effective theory. Heavy quark mass corrections enhance the cross section sizably and cannot be ignored when the quark mass is comparable with the jet size $E_{J}R$. We also analyze the exclusive heavy quark pair production in the limit as $R$ goes to zero. Using the resummed result, the top isolation effects on the cross section are estimated.

arXiv comment14 pages, 3 figures; Mistakes in numerical analysis have been fixed. And Figs. 2 and 3 have been changed

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