Regular Article - Experimental Physics
The anomalous production of multi-leptons and its impact on the measurement of Wh production at the LHC
School of Physics and Institute for Collider Particle Physics, University of the Witwatersrand (Wits), 2050, Johannesburg, South Africa
2 Department of Physics, University of Johannesburg, PO Box 524, 2006, Auckland Park, South Africa
3 Institute of High Energy Physics, 19B, Yuquan Road, Shijing District, 100049, Beijing, China
4 University of Chinese Academy of Sciences (CAS), 19A Yuquan Road, Shijing District, 100049, Beijing, China
5 iThemba LABS, National Research Foundation, PO Box 722, 7129, Somerset West, South Africa
Accepted: 13 April 2021
Published online: 27 April 2021
Anomalies in multi-lepton final states at the Large Hadron Collider (LHC) have been reported in Refs. (von Buddenbrock et al., J Phys G 45(11):115003, arXiv:1711.07874 [hep-ph], 2018; Buddenbrock et al., JHEP 1910:157, arXiv:1901.05300 [hep-ph], 2019). These can be interpreted in terms of the production of a heavy boson, H, decaying into a standard model (SM) Higgs boson, h, and a singlet scalar, S, which is treated as a SM Higgs-like boson. This process would naturally affect the measurement of the Wh signal strength at the LHC, where h is produced in association with leptons and di-jets. Here, h would be produced with lower transverse momentum, , compared to SM processes. Corners of the phase-space are fixed according to the model parameters derived in Refs. (von Buddenbrock et al., J Phys G 45(11):115003, arXiv:1711.07874 [hep-ph], 2018; von Buddenbrock et al., Eur Phys J C 76(10):580, arXiv:1606.01674 [hep-ph], 2016) without additional tuning, thus nullifying potential look-else-where effects or selection biases. Provided that no stringent requirements are made on or related observables, the signal strength of Wh is . This corresponds to a deviation from the SM of . This result further strengthens the need to measure with precision the SM Higgs boson couplings in , and collisions, in addition to pp collisions.
© The Author(s) 2021
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