Factorization and Resummation for Massive Quark Effects in Exclusive Drell-Yan
| Autor: | Frank J. Tackmann, Anne Spiering, Daniel Samitz, Piotr Pietrulewicz |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Drell-Yan process
Quark Nuclear and High Energy Physics Particle physics transverse momentum [vector boson] FOS: Physical sciences splitting [gluon] hierarchy 01 natural sciences decoupling hard scattering benchmark High Energy Physics - Phenomenology (hep-ph) Factorization factorization Jets 0103 physical sciences Effective field theory ddc:530 lcsh:Nuclear and particle physics. Atomic energy. Radioactivity heavy quark thrust Rapidity Resummation 010306 general physics effect [quark] Boson Physics precision measurement 010308 nuclear & particles physics High Energy Physics::Phenomenology QCD Phenomenology boundary condition Gluon Massless particle High Energy Physics - Phenomenology rapidity CERN LHC Coll resummation spectrum [boson] soft collinear effective theory lcsh:QC770-798 massive [quark] effect [mass] hadron |
| Zdroj: | Journal of High Energy Physics, Vol 2017, Iss 8, Pp 1-72 (2017) Journal of High Energy Physics Journal of high energy physics 1708(08), 114 (2017). doi:10.1007/JHEP08(2017)114 |
| DOI: | 10.48550/arxiv.1703.09702 |
| Popis: | Journal of high energy physics 1708(08), 114 (2017). doi:10.1007/JHEP08(2017)114 Exclusive differential spectra in color-singlet processes at hadron colliders are benchmark observables that have been studied to high precision in theory and experiment. We present an effective-theory framework utilizing soft-collinear effective theory to incorporate massive (bottom) quark effects into resummed differential distributions, accounting for both heavy-quark initiated primary contributions to the hard scattering process as well as secondary effects from gluons splitting into heavy-quark pairs. To be specific, we focus on the Drell-Yan process and consider the vector-boson transverse momentum, $q_T$, and beam thrust, $\mathcal T$, as examples of exclusive observables. The theoretical description depends on the hierarchy between the hard, mass, and the $q_T$ (or $\mathcal T$) scales, ranging from the decoupling limit $q_T \ll m$ to the massless limit $m \ll q_T$. The phenomenologically relevant intermediate regime $m \sim q_T$ requires in particular quark-mass dependent beam and soft functions. We calculate all ingredients for the description of primary and secondary mass effects required at NNLL$'$ resummation order (combining NNLL evolution with NNLO boundary conditions) for $q_T$ and $\mathcal T$ in all relevant hierarchies. For the $q_T$ distribution the rapidity divergences are different from the massless case and we discuss features of the resulting rapidity evolution. Our results will allow for a detailed investigation of quark-mass effects in the ratio of $W$ and $Z$ boson spectra at small $q_T$, which is important for the precision measurement of the $W$-boson mass at the LHC. Published by Springer, Berlin |
| Databáze: | OpenAIRE |
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