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Analyticity, crossing, and the absorptive parts of the one-loop contributions to the quark-quark-gluon-gauge-boson four-point function

Körner, Juergen G.; Melić, Blaženka; Merebashvili, Z. (2000) Analyticity, crossing, and the absorptive parts of the one-loop contributions to the quark-quark-gluon-gauge-boson four-point function. Physical Review D, 62 (9). 096011-1-096011-15. ISSN 1550-7998

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Abstract

Starting from the known one-loop result for the e+e--annihilation process e+e-→γ,Zqq̅ g with massless quarks we employ analyticity and crossing to determine the absorptive parts of the corresponding one-loop contributions in deep inelastic scattering (DIS) and in the Drell-Yan (DY) process. Whereas the O(αs2) absorptive parts generate a nonmeasurable phase factor in the e+e--annihilation channel one obtains measurable phase effects from the one-loop contributions in the deep inelastic and Drell-Yan cases. We compare our results with the results of previous calculations where the absorptive parts in DIS and in the DY process were calculated directly in the respective channels. We also present some new results on the dispersive and absorptive contributions of the triangle anomaly graph to the DIS process.

Item Type: Article
Uncontrolled Keywords: 3 jets; annihilation; asymmetries; colliders; qcd
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Divisions: Theoretical Physics Division
Projects:
Project titleProject leaderProject codeProject type
Teorijska istraživanja osobina fundamentalnih česticaGuberina, Branko00980102MZOS
Depositing User: Blaženka Melić
Date Deposited: 30 Sep 2013 09:27
Last Modified: 15 Feb 2016 12:01
URI: http://fulir.irb.hr/id/eprint/659
DOI: 10.1103/PhysRevD.62.096011

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