July 31, 2017 to August 4, 2017
Fermi National Accelerator Laboratory
US/Central timezone

Mass Dependence of Higgs Production at Large Transverse Momentum

Jul 31, 2017, 2:30 PM
20m
Sunrise (Fermi National Accelerator Laboratory)

Sunrise

Fermi National Accelerator Laboratory

Presentation Higgs and EWSB Higgs and EWSB

Speaker

Eric Braaten (Ohio State University)

Description

The transverse momentum distribution of the Higgs at large $P_T$ is complicated by its dependence on three important energy scales: $P_T$, the top quark mass $m_t$, and the Higgs mass $m_H$. A strategy for simplifying the calculation of the cross section at large $P_T$ is to calculate only the leading terms in its expansion in $m_t^2/P_T^2$ and/or $m_H^2/P_T^2$. The expansion of the cross section in inverse powers of $P_T$ is complicated by logarithms of $P_T$ and by mass singularities. In this work, we consider the top-quark-loop contribution to the subprocess $q\bar{q}\to H+g$ at leading order in $\alpha_s$, which proceeds through a top quark loop. We show that the leading power of $1/P_T^2$ can be expressed in the form of a factorization formula that separates the large scale $P_T$ from the scale of the masses. All the dependence on $m_t$ and $m_H$ can be factorized into fragmentation amplitudes for $t \bar t \to H$ and for $t \bar t \to g$ and an endpoint contribution. This factorization approach will be useful for calculating the $P_T$ distribution at large $P_T$ to next-to-leading order in $\alpha_s$.

Primary author

Eric Braaten (Ohio State University)

Co-author

Dr Hong Zhang (The Ohio State University)

Presentation materials