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- W2755665458 abstract "We reveal a new mechanism of conformal symmetry breaking at Born level. It occurs in generalized form factors with several local operators and an on-shell state of massless particles. The effect is due to hidden singularities on collinear configurations of the momenta. This conformal anomaly is different from the holomorphic anomaly of amplitudes. We present a number of examples in four and six dimensions. We find an application of the new conformal anomaly to finite loop momentum integrals with one or more massless legs. The collinear region around a massless leg creates a contact anomaly, made visible by the loop integration. The anomalous conformal Ward identity for an $ell-$loop integral is a 2nd-order differential equation whose right-hand side is an $(ell-1)-$loop integral. We show several examples, in particular the four-dimensional scalar double box." @default.
- W2755665458 created "2017-09-25" @default.
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- W2755665458 date "2018-04-01" @default.
- W2755665458 modified "2023-09-30" @default.
- W2755665458 title "Conformal anomaly of generalized form factors and finite loop integrals" @default.
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- W2755665458 doi "https://doi.org/10.1007/jhep04(2018)082" @default.
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