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Brown, Robert W.; Sahdev, Deshdeep; Mikaelian, Karnig O.

doi:10.1103/physrevd.20.1164

Cited by 141 publications

(83 citation statements)

References 14 publications

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“…It is now more than a dozen years since radiation amplitude zeros were first discovered [1] in the process ud → W + γ [2]. Subsequently, it was shown [3,4,5] that these can arise more generally, originating as the destructive interference of radiation patterns in gaugetheory tree amplitudes for massless gauge-boson emission.…”

Section: Introductionmentioning

confidence: 99%

Radiation tree amplitudes: Zeroing in on more photons and gluons

1994

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We discuss radiation zeros that are found in gauge tree amplitudes for processes involving multi-photon emission. Previous results are clarified by examples and by further elaboration. The conditions under which such amplitude zeros occur are identical in form to those for the single-photon zeros, and all radiated photons must travel parallel to each other. Any other neutral particle likewise must be massless (e.g. gluon) and travel in that common direction. The relevance to questions like gluon jet identification and computational checks is considered. We use examples to show how certain multi-photon amplitudes evade the zeros, and to demonstrate the connection to a more general result, the decoupling of an external electromagnetic plane wave in the "null zone". Brief comments are made about zeros associated with other gauge-boson emission.

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Section: Introductionmentioning

confidence: 99%

Radiation tree amplitudes: Zeroing in on more photons and gluons

1994

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“…Interestingly and importantly, the last ratio is automatically the same if the rest are equal, by virtue of charge and momentum conservation. 2 In the garden variety reactions, we could look, for example, at electron-electron bremsstrahlung, e − e − → e − e − γ. The Born amplitude vanishes if the photon is at right angles to the c.m.…”

Section: Physical Null Zonesmentioning

confidence: 99%

“…(Striking dips in the angular distributions of νe → W γ and qq → W γ corresponding to the zeros had been seen earlier. [2]) The zero in the qq channel has proven to be an important signature in testing the trilinear W W γ couplings, as wonderful progress is drawing tighter and tighter bounds. So far, all are converging to the standard model predictions.…”

Section: Introductionmentioning

confidence: 99%

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Understanding something about nothing: Radiation zeros

Brown¹

1995

AIP Conference Proceedings

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Radiation symmetry is briefly reviewed, along with its historical, experimental, computational, and theoretical relevance. A sketch of the proof of a theorem for radiation zeros is used to highlight the connection between gauge-boson couplings and Poincare transformations. It is emphasized that while mostly bad things happen to good zeros, the weak-boson self-couplings continue to be intimately tied to the best examples of exact or approximate zeros.

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“…For example, the vanishing of the tree-level amplitude of certain processes involving the emission of a gauge boson is very sensitive to the form of the trilinear couplings. Thus, the detection of amplitude zeros were proposed as a way to constraint the existence of anomalous couplings in the standard model [1,2] (see [3][4][5] for reviews). Although these so-called type-I zeros are corrected by both loops and higher-order emissions, they manifest themselves in the existence of dips for a set of observables, a fact that has been confirmed by various experimental groups [6,7].…”

Section: Introductionmentioning

confidence: 99%

Projectivity of planar zeros in field and string theory amplitudes

Jiménez

Vera

Vázquez-Mozo

2017

J. High Energ. Phys.

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Abstract:We study the projective properties of planar zeros of tree-level scattering amplitudes in various theories. Whereas for pure scalar field theories we find that the planar zeros of the five-point amplitude do not enjoy projective invariance, coupling scalars to gauge fields gives rise to tree-level amplitudes whose planar zeros are determined by homogeneous polynomials in the stereographic coordinates labelling the direction of flight of the outgoing particles. In the case of pure gauge theories, this projective structure is generically destroyed if string corrections are taken into account. Scattering amplitudes of two scalars with graviton emission vanish exactly in the planar limit, whereas planar graviton amplitudes are zero for helicity violating configurations. These results are corrected by string effects, computed using the single-valued projection, which render the planar amplitude nonzero. Finally, we discuss how the structure of planar zeros can be derived from the soft limit behavior of the scattering amplitudes.

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W±Z0andW±

Cited by 141 publications

References 14 publications

Radiation tree amplitudes: Zeroing in on more photons and gluons

Radiation tree amplitudes: Zeroing in on more photons and gluons

Understanding something about nothing: Radiation zeros

Projectivity of planar zeros in field and string theory amplitudes

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