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The small kt-region in Drell-Yan production at next-to-leading order with the Parton Branching Method
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The Parton Branching (PB) method describes the evolution of transverse momentum dependent (TMD) parton distributions, covering all kinematic regions from small to large transverse momenta kT. The small kT-region is very sensitive both to the contribution of the intrinsic motion of partons (intrinsic kT) and to the resummation of soft gluons taken into account by the PB TMD evolution equations. We study the role of soft-gluon emissions in TMD as well as integrated parton distributions. We perform a detailed investigation of the PB TMD methodology at next-to-leading order (NLO) in Drell-Yan (DY) production for low transverse momenta. We present the extraction of the nonperturbative "intrinsic-kT" distribution from recent measurements of DY transverse momentum distributions at the LHC across a wide range in DY masses, including a detailed treatment of statistical, correlated and uncorrelated uncertainties. We comment on the (in)dependence of intrinsic transverse momentum on DY mass and center-of-mass energy, and on the comparison with other approaches.
Forward citations
Cited by 7 Pith papers
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Dihadron Angular Correlations in the $e^+e^-$ Collision
The paper derives the first complete O(alpha_s^2) analytic QCD corrections to the dihadron angular separation distribution in e+e- annihilation, with verified cancellation of infrared poles.
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Soft-gluon coupling and the TMD parton branching Sudakov form factor
The parton branching TMD framework is upgraded from NLL to NNLL accuracy using the soft-gluon physical coupling, with the Collins-Soper kernel evaluated at NNLL.
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Non-perturbative effects and soft-gluon dynamics in low-$p_T$ Drell-Yan production
With a remnant-only recoil scheme, the PDF2ISR shower reproduces PB-TMD Drell-Yan predictions and data from sqrt(s)=38.8 GeV to 13 TeV using one energy-independent intrinsic-kT width (q_s=1.04 GeV); low-pT spectra exp...
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Non-Perturbative Contributions to Low Transverse Momentum Drell-Yan Pair Production Using the Parton Branching Method
The fitted intrinsic-kT width obtained from CASCADE3 Drell-Yan simulations is independent of the pair invariant mass at LHC energies, consistent with the slow scale dependence of the non-perturbative Sudakov form fact...
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Interplay of intrinsic motion of partons and soft gluon emissions in Drell-Yan production studied with PYTHIA
The sqrt(s)-dependent intrinsic-kT width in PYTHIA 8 is traced to soft gluon emissions controlled by the ISR cutoff pT0Ref, with the fitted width increasing nearly linearly with pT0Ref.
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A $p_T$-ratio observable for studies of intrinsic transverse momentum of partons from Drell-Yan $p_T$ spectra
The pT-ratio observable, a ratio of Drell-Yan event counts below and above a chosen momentum, extracts the intrinsic parton transverse momentum width qs with sensitivity comparable to fine-binned pT spectra.
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What can we learn from the Parton Branching method in QCD?
A proceedings review that highlights recent PB method results: NNLL Sudakov accuracy, a PB-CSS correspondence, and a fully consistent forward-backward shower called Pdf2Isr.
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