One-loop gluonic amplitudes from single unitarity cuts
نویسندگان
چکیده
منابع مشابه
One-Loop Gluonic Amplitudes from Single Unitarity Cuts
We show that one-loop amplitudes in massless gauge theories can be determined from single cuts. By cutting a single propagator and putting it on-shell, the integrand of an n-point one-loop integral is transformed into an (n + 2)-particle tree level amplitude. The single-cut approach described here is complementary to the double or multiple unitarity cut approaches commonly used in the literatur...
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We propose a systematic way to carry out the method introduced in hep-th/0410077 for computing certain unitarity cuts of one-loop N = 4 amplitudes of gluons. We observe that the class of cuts for which the method works involves all next-to-MHV ngluon one-loop amplitudes of any helicity configurations. As an application of our systematic procedure, we obtain the complete seven-gluon one-loop lea...
متن کاملMassive Loop Amplitudes from Unitarity
We show, for previously uncalculated examples containing a uniform mass in the loop, that it is possible to obtain complete massive one-loop gauge theory amplitudes solely from unitarity and known ultraviolet or infrared mass singularities. In particular, we calculate four-gluon scattering via massive quark loops in QCD. The contribution of a heavy quark to five-gluon scattering with identical ...
متن کاملMHV One-Loop Amplitudes in Yang-Mills from Generalised Unitarity
In this letter, we exploit generalised unitarity in order to calculate the cut-constructible part of one-loop amplitudes in non-supersymmetric Yang-Mills theory. In particular, we rederive the n-gluon MHV amplitudes for both the adjacent and non-adjacent gluon helicity configurations from 3and 4-particle cuts alone. {a.brandhuber, m.vincon}@qmul.ac.uk
متن کاملHolomorphic Anomaly Of Unitarity Cuts And One-Loop Gauge Theory Amplitudes
We show how the holomorphic anomaly found in hep-th/0409245 can be used to efficiently compute certain classes of unitarity cuts of one-loop N = 4 amplitudes of gluons. These classes include all cuts of n-gluon one-loop MHV amplitudes and of n-gluon next-toMHV amplitudes with helicities (1, 2, 3, 4, . . . , n). As an application of this method, we present the explicit computation of the (1, 2, ...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2008
ISSN: 1029-8479
DOI: 10.1088/1126-6708/2008/12/067