Drell-Yan qT resummation of fiducial power corrections at N3LL
Abstract We consider Drell-Yan production pp → V*X → LX at small qT ≪ Q, where qT 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,...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2021
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| Online Access: | https://hdl.handle.net/1721.1/136772 |
| _version_ | 1826214003196559360 |
|---|---|
| author | Ebert, Markus A Michel, Johannes K L Stewart, Iain W Tackmann, Frank J |
| author2 | Massachusetts Institute of Technology. Center for Theoretical Physics |
| author_facet | Massachusetts Institute of Technology. Center for Theoretical Physics Ebert, Markus A Michel, Johannes K L Stewart, Iain W Tackmann, Frank J |
| author_sort | Ebert, Markus A |
| collection | MIT |
| description | Abstract
We consider Drell-Yan production pp → V*X → LX at small qT ≪ Q, where qT 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 qT/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 qT spectrum, they constitute the complete linear power corrections. We thus obtain predictions for the fiducial qT spectrum to N3LL and next-to-leading-power in qT/Q. Matching to full NNLO (
α
s
2
$$ {\alpha}_s^2 $$
), 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 qT ≲ 40 GeV. We also discuss the implications for more complicated observables, and provide predictions for the fiducial ϕ* spectrum at N3LL+NNLO. We find excellent agreement with ATLAS and CMS measurements of qT and ϕ*. We also consider the
p
T
ℓ
$$ {p}_T^{\mathrm{\ell}} $$
spectrum. We show that it develops leptonic power corrections in qT/(Q − 2
p
T
ℓ
$$ {p}_T^{\mathrm{\ell}} $$
), which diverge near the Jacobian peak
p
T
ℓ
$$ {p}_T^{\mathrm{\ell}} $$
∼ 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
$$ {p}_T^{\mathrm{\ell}} $$
spectrum around the Jacobian peak at N3LL+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 qT 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. |
| first_indexed | 2024-09-23T15:58:16Z |
| format | Article |
| id | mit-1721.1/136772 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T15:58:16Z |
| publishDate | 2021 |
| publisher | Springer Berlin Heidelberg |
| record_format | dspace |
| spelling | mit-1721.1/1367722024-01-03T18:17:23Z Drell-Yan qT resummation of fiducial power corrections at N3LL Ebert, Markus A Michel, Johannes K L Stewart, Iain W Tackmann, Frank J Massachusetts Institute of Technology. Center for Theoretical Physics Abstract We consider Drell-Yan production pp → V*X → LX at small qT ≪ Q, where qT 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 qT/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 qT spectrum, they constitute the complete linear power corrections. We thus obtain predictions for the fiducial qT spectrum to N3LL and next-to-leading-power in qT/Q. Matching to full NNLO ( α s 2 $$ {\alpha}_s^2 $$ ), 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 qT ≲ 40 GeV. We also discuss the implications for more complicated observables, and provide predictions for the fiducial ϕ* spectrum at N3LL+NNLO. We find excellent agreement with ATLAS and CMS measurements of qT and ϕ*. We also consider the p T ℓ $$ {p}_T^{\mathrm{\ell}} $$ spectrum. We show that it develops leptonic power corrections in qT/(Q − 2 p T ℓ $$ {p}_T^{\mathrm{\ell}} $$ ), which diverge near the Jacobian peak p T ℓ $$ {p}_T^{\mathrm{\ell}} $$ ∼ 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 $$ {p}_T^{\mathrm{\ell}} $$ spectrum around the Jacobian peak at N3LL+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 qT 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. 2021-11-01T14:33:16Z 2021-11-01T14:33:16Z 2021-04-12 2021-04-18T04:08:16Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/136772 Journal of High Energy Physics. 2021 Apr 12;2021(4):102 PUBLISHER_CC en https://doi.org/10.1007/JHEP04(2021)102 Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Berlin Heidelberg Springer Berlin Heidelberg |
| spellingShingle | Ebert, Markus A Michel, Johannes K L Stewart, Iain W Tackmann, Frank J Drell-Yan qT resummation of fiducial power corrections at N3LL |
| title | Drell-Yan qT resummation of fiducial power corrections at N3LL |
| title_full | Drell-Yan qT resummation of fiducial power corrections at N3LL |
| title_fullStr | Drell-Yan qT resummation of fiducial power corrections at N3LL |
| title_full_unstemmed | Drell-Yan qT resummation of fiducial power corrections at N3LL |
| title_short | Drell-Yan qT resummation of fiducial power corrections at N3LL |
| title_sort | drell yan qt resummation of fiducial power corrections at n3ll |
| url | https://hdl.handle.net/1721.1/136772 |
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