Year: 2024
Type: conference-paper
Abstract: We present the first lattice QCD calculation of the rapidity anomalous dimension of transverse- momentum-dependent distributions (TMDs), i.e. the Collins-Soper (CS) kernel, employing the recently proposed Coulomb-gauge-fixed quasi-TMD formalism as well as a chiral-symmetry pre- serving lattice discretization. This unitary lattice calculation is conducted using the domain wall fermion discretization scheme, a fine lattice spacing of approximately 0.08 fm, and physical values for light and strange quark masses. The CS kernel is determined analyzing the ratios of pion quasi-TMD wave functions (quasi-TMDWFs) at next-to-leading logarithmic (NLL) perturbative accuracy. Thanks to the absence of Wilson-lines, the Coulomb-gauge-fixed quasi-TMDWF demonstrates a remarkably slower decay of signals with increasing quark separations. This allows us to access the non-perturbative CS kernel up to transverse separations of 1 fm. For small transverse separations, our results agree well with perturbative predictions. At larger transverse separations, our non- perturbative CS kernel clearly favors certain global fits.
DOI: 10.22323/1.469.0238
Institutions: Brookhaven National Laboratory, Argonne National Laboratory
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Awards: G102163711, G107546177, G111697547, G121915436, G122673668, G1286236842, G1313983767, G1645119126, G1664757510, G1677143136, G171842289, G1760870335, G203625172, G2287611682, G241279073, G262962599, G2638771445, G275679244, G2821925151, G2896472831, G2988778103, G3075337988, G3083819904, G357145406, G419881185, G42916606, G4501827968, G498139845, G5076365615, G5765906131, G6671350717, G6848031779, G6918803902, G7463374569, G7651947074, G8269158468, G8906985441, G969889393, G993149817
OpenAlex ID: W4405847972