Factorization and resummation for massive quark effects in exclusive Drell-Yan

Autor(en)

Piotr Pietrulewicz, Daniel Samitz, Anne Spiering, Frank J. Tackmann

Abstrakt

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(en)

Teilchenphysik

Externe Organisation(en)

Deutsches Elektronen-Synchrotron DESY, Humboldt-Universität zu Berlin

Journal

Journal of High Energy Physics

Band

2017

Anzahl der Seiten

72

ISSN

1029-8479

DOI

https://doi.org/10.1007/JHEP08(2017)114

Publikationsdatum

08-2017

Peer-reviewed

Ja

ÖFOS 2012

103012 Hochenergiephysik

Schlagwörter

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5c02f243-5d85-4b03-9866-61d8043205da