Drell-Yan qT resummation of fiducial power corrections at N3LL.
In: Journal of High Energy Physics, Jg. 2021 (2021-04-01), Heft 4, S. 1-102
academicJournal
Zugriff:
We consider Drell-Yan production pp → V * X → LX at small q T ≪ Q, where q T and Q are the total transverse momentum and invariant mass of the leptonic final state L. Experimental measurements require fiducial cuts on L, which in general introduce enhanced, linear power corrections in q T /Q. We show that they can be unambiguously predicted from factorization, and resummed to the same order as the leading-power contribution. For the fiducial q T spectrum, they constitute the complete linear power corrections. We thus obtain predictions for the fiducial q T spectrum to N 3 LL and next-to-leading-power in q T /Q. Matching to full NNLO ( α s 2 ), we find that the linear power corrections are indeed the dominant ones, and once included by factorization, the remaining fixed-order corrections become almost negligible below q T ≲ 40 GeV. We also discuss the implications for more complicated observables, and provide predictions for the fiducial ϕ * spectrum at N 3 LL+NNLO. We find excellent agreement with ATLAS and CMS measurements of q T and ϕ * . We also consider the p T ℓ spectrum. We show that it develops leptonic power corrections in q T /(Q − 2 p T ℓ ), which diverge near the Jacobian peak p T ℓ ∼ Q/2 and must be kept to all powers to obtain a meaningful result there. Doing so, we obtain for the first time an analytically resummed result for the p T ℓ spectrum around the Jacobian peak at N 3 LL+NNLO. Our method is based on performing a complete tensor decomposition for hadronic and leptonic tensors. We show that in practice this is equivalent to often-used recoil prescriptions, for which our results now provide rigorous, formal justification. Our tensor decomposition yields nine Lorentz-scalar hadronic structure functions, which for Z/γ * → ℓℓ or W → ℓν directly map onto the commonly used angular coefficients, but also holds for arbitrary leptonic final states. In particular, for suitably defined Born-projected leptons it still yields a LO-like angular decomposition even when including QED final-state radiation. Finally, we also discuss the application to q T subtractions. Including the unambiguously predicted fiducial power corrections significantly improves their performance, and in particular makes them applicable near kinematic edges where they otherwise break down due to large leptonic power corrections. [ABSTRACT FROM AUTHOR]
Copyright of Journal of High Energy Physics is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Titel: |
Drell-Yan qT resummation of fiducial power corrections at N3LL.
|
---|---|
Autor/in / Beteiligte Person: | Ebert, Markus A. ; Michel, Johannes K. L. ; Stewart, Iain W. ; Tackmann, Frank J. |
Zeitschrift: | Journal of High Energy Physics, Jg. 2021 (2021-04-01), Heft 4, S. 1-102 |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 1126-6708 (print) |
DOI: | 10.1007/JHEP04(2021)102 |
Schlagwort: |
|
Sonstiges: |
|