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2017:groups:np:eftinterference [2017/06/18 00:12] julia.harz |
2017:groups:np:eftinterference [2017/06/21 16:19] francesco.riva |
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====== Non-interference in dimension 6 EFT: beyond LO & 2 to 2 processes ====== | ====== Non-interference in dimension 6 EFT: beyond LO & 2 to 2 processes ====== | ||
- | People interested (add your name): Francesco Riva, Ken Mimasu, Benjamin Fuks, Julia Harz | + | People interested (add your name): Francesco Riva, Ken Mimasu, Benjamin Fuks, Julia Harz, Kristin Lohwasser, Fabio Maltoni, Jorge de Blas, Daniele Barducci, Minho Son, Haiying Cai |
Investigate the impact of higher order corrections or additional radiation on high energy 2->2 processes involving dimension 6 EFT operators that have been shown not to interfere at leading order. | Investigate the impact of higher order corrections or additional radiation on high energy 2->2 processes involving dimension 6 EFT operators that have been shown not to interfere at leading order. | ||
A simple test case may be $W^+ W^-$ production at a lepton collider. Here the EW corrections including dimension 6 operators have not been calculated but an extra photon (or any extra vector) emission would alter the helicity structure and is part of the higher order contribution. | A simple test case may be $W^+ W^-$ production at a lepton collider. Here the EW corrections including dimension 6 operators have not been calculated but an extra photon (or any extra vector) emission would alter the helicity structure and is part of the higher order contribution. | ||
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+ | We focus on the operator that generates transverse helicity, schematically O_3W= W_{munu}^3 | ||
References: | References: | ||
* "Helicity selection rules and noninterference for BSM amplitudes" [[https://arxiv.org/abs/1607.05236| (arXiv)]] | * "Helicity selection rules and noninterference for BSM amplitudes" [[https://arxiv.org/abs/1607.05236| (arXiv)]] | ||
- | * Rivet tool implementing stage 1 and 0 selections maintained by LHCHXSWG [[https://svnweb.cern.ch/cern/wsvn/lhchiggsxs/repository/TemplateXS/| (link)]] | + | * "Testing gluon selfinteractions in three jet events at hadron colliders" [[https://arxiv.org/abs/hep-ph/9312363| (arXiv)]] |
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+ | Helicity amplitude from madgraph (2 to 2 and 2 to 3): | ||
+ | - https://phystev.cnrs.fr/wiki/_media/2017:groups:np:ee_ww_sm_only.tgz | ||
+ | - https://phystev.cnrs.fr/wiki/_media/2017:groups:np:ee_ww_int_only.tgz | ||
+ | - https://phystev.cnrs.fr/wiki/_media/2017:groups:np:ee_ww_sm_dim6.tgz | ||
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+ | Benchmark parameters from CLIC [https://arxiv.org/abs/1608.07537 -- Updated baseline for a staged Compact Linear Collider] | ||
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+ | accelerator design foresees 80% electron polarisation. | ||
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+ | stages running with different CME and luminosity: | ||
+ | {{:2017:groups:np:clic.jpg?direct&400|}} |