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- W2891566350 abstract "A bstract The cross section for top quark pair production factorizes at small transverse momentum of the heavy quark pair, q T . One of the key ingredients that appears in the factorization formula is the soft function, which mediates soft gluon exchanges between particles and gives rise to colour correlations. We present the complete result for the small- q T soft function at the next-to-next-to-leading order. This is the last missing element needed to calculate the NNLO cross section for top quark pair production by means of the q T slicing method. In order to evaluate divergent integrals appearing in the calculation, we develop methods based on sector decomposition and differential equations. We present an extensive validation of our framework. In particular, we recover results predicted by the renormalization group, which constitutes a direct demonstration of validity of the small- q T factorization at NNLO. We provide complete results for the real and imaginary part of the soft function, which are ready for application in the calculation of the $$ toverline{t} $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> cross section at NNLO." @default.
- W2891566350 created "2018-09-27" @default.
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- W2891566350 date "2018-10-01" @default.
- W2891566350 modified "2023-10-14" @default.
- W2891566350 title "NNLO soft function for top quark pair production at small transverse momentum" @default.
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- W2891566350 doi "https://doi.org/10.1007/jhep10(2018)201" @default.
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