A promising avenue to perform precision tests of the SM at the LHC is to measure differential cross-sections at high invariant mass, exploiting in this way the growth with the energy of the corrections induced by heavy new physics. We classify the leading growing-with-energy effects in longitudinal diboson and in associated Higgs production processes, showing that they can be encapsulated in four real “high-energy primary” parameters. We assess the reach on these parameters at the LHC and at future hadronic colliders, focusing in particular on the fully leptonic W Z channel that appears particularly promising. The reach is found to be superior to existing constraints by one order of magnitude, providing a test of the SM electroweak sector at the per-mille level, in competition with LEP bounds. Unlike LHC run-1 bounds, which only apply to new physics effects that are much larger than the SM in the high-energy tail of the distributions, the probe we study applies to a wider class of new physics scenarios where such large departures are not expected.

Franceschini, R., Panico, G., Pomarol, A., Riva, F., Wulzer, A. (2018). Electroweak precision tests in high-energy diboson processes. JOURNAL OF HIGH ENERGY PHYSICS, 2018(2) [10.1007/JHEP02(2018)111].

Electroweak precision tests in high-energy diboson processes

Franceschini, Roberto;
2018-01-01

Abstract

A promising avenue to perform precision tests of the SM at the LHC is to measure differential cross-sections at high invariant mass, exploiting in this way the growth with the energy of the corrections induced by heavy new physics. We classify the leading growing-with-energy effects in longitudinal diboson and in associated Higgs production processes, showing that they can be encapsulated in four real “high-energy primary” parameters. We assess the reach on these parameters at the LHC and at future hadronic colliders, focusing in particular on the fully leptonic W Z channel that appears particularly promising. The reach is found to be superior to existing constraints by one order of magnitude, providing a test of the SM electroweak sector at the per-mille level, in competition with LEP bounds. Unlike LHC run-1 bounds, which only apply to new physics effects that are much larger than the SM in the high-energy tail of the distributions, the probe we study applies to a wider class of new physics scenarios where such large departures are not expected.
2018
Franceschini, R., Panico, G., Pomarol, A., Riva, F., Wulzer, A. (2018). Electroweak precision tests in high-energy diboson processes. JOURNAL OF HIGH ENERGY PHYSICS, 2018(2) [10.1007/JHEP02(2018)111].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/331731
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