Factorization and resummation for massive quark effects in exclusive Drell-Yan
- Author(s)
- Piotr Pietrulewicz, Daniel Samitz, Anne Spiering, Frank J. Tackmann
- Abstract
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, T, as examples of exclusive observables. The theoretical description depends on the hierarchy between the hard, mass, and the q
T (or T) scales, ranging from the decoupling limit q
T ≪ m to the massless limit m ≪ q
T. The phenomenologically relevant intermediate regime m ∼ 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 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.
- Organisation(s)
- Particle Physics
- External organisation(s)
- Deutsches Elektronen-Synchrotron DESY, Humboldt-Universität zu Berlin
- Journal
- Journal of High Energy Physics
- Volume
- 2017
- No. of pages
- 72
- ISSN
- 1029-8479
- DOI
- https://doi.org/10.1007/JHEP08(2017)114
- Publication date
- 08-2017
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103012 High energy physics
- Keywords
- ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/factorization-and-resummation-for-massive-quark-effects-in-exclusive-drellyan(5c02f243-5d85-4b03-9866-61d8043205da).html