Matches and mismatches in the descriptions of semi-inclusive processes at low and high transverse momentum

Journal Article · Fri Aug 01 04:00:00 EDT 2008 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1088/1126-6708/2008/08/023· OSTI ID:955842

Bacchetta, Alessandro; Boer, Daniel; Diehl, Markus; Mulders, Piet

We investigate the transverse-momentum-dependence in semi-inclusive deep inelastic leptoproduction of hadrons. There are two different theoretical approaches to study this dependence, one for low and one for high transverse momentum of the observed hadron. We systematically investigate their connection, paying special attention to azimuthal distributions and to polarization dependence. In the region of intermediate transverse momentum, where both approaches are applicable, we find that their results match for certain observables but not for others. Interpolating expressions are discussed for the case where one has no matching. We then use power counting to determine which mechanism is dominant in various azimuthal and spin asymmetries that are integrated over the transverse momentum. Our findings have consequences for the extension of transverse-momentum-dependent factorization beyond leading twist. They also shed light on the problem of resumming logarithms of transverse momentum for

• Research Organization: Thomas Jefferson Lab National Accelerator Facility
• Sponsoring Organization: USDOE
• OSTI ID: 955842
• Report Number(s): JLAB-THY-08-782; arXiv:0803.0227; DOE/OR/23177-0335
• Journal Information: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Vol. 0808; ISSN 1029-8479
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
FACTORIZATION
HADRONS
POLARIZATION
SPIN
TRANSVERSE MOMENTUM