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Jet Definition and Transverse-Momentum–Dependent Factorization in Semi-inclusive Deep-Inelastic Scattering

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4]
  1. Université de Nantes (France); Centre National de la Recherche Scientifique (CNRS) (France)
  2. Univ. Paris-Saclay, Gif-sur-Yvette (France)
  3. Columbia Univ., New York, NY (United States)
  4. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Tubingen (Germany)
Using the color dipole picture of deep inelastic scattering (DIS) and the color glass condensate effective theory, we study semi-inclusive jet production in DIS at small x in the limit where the photon virtuality Q2 is much larger than the transverse momentum squared P$$^{2}_{⊥}$$ of the produced jet. In this limit, the cross section is dominated by aligned jet configurations, that is, quark–antiquark pairs in which one of the fermions—the would-be struck quark in the Breit frame—carries most of the longitudinal momentum of the virtual photon. We show that physically meaningful jet definitions in DIS are such that the effective axis of the jet sourced by the struck quark is controlled by its virtuality rather than by its transverse momentum. For such jet definitions, we show that the next-to-leading order cross section admits factorization in terms of the (sea) quark transverse momentum dependent distribution, which in turn satisfies a universal Dokshitzer-Gribov-Lipatov-Altarelli-Parisi and Sudakov evolution.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-05CH11231; FG02-92ER40699
OSTI ID:
2514501
Alternate ID(s):
OSTI ID: 2562808
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 Vol. 134; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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