Publication: Study of Corrections for Anomalous Coupling Limits Due to the Possible Background BSM Contributions
Дата
2022
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Аннотация
The search for anomalous couplings is one of the possible ways to find any deviations from the Standard Model. Effective field theory is used to parameterize the anomalous couplings in the Lagrangian with operators of higher dimensions constructed from the SM fields. In the classical way, the limits on the Wilson coefficients of these operators are set based on beyond the Standard Model contributions induced for the signal process, whereas the ones induced for background processes are assumed to be negligible. This article provides a study of the corrections to the limits on Wilson coefficients by considering beyond the Standard Model contributions induced for background processes. The studies of Z(ОЅОЅВЇ)Оіjj and W(в„“ОЅ)Оіjj productions in pp collisions with s=13 TeV and conditions of the ATLAS experiment at the LHC are used as an example. Cases with integrated luminosity collected during Run II of 139 fbв€’1 and expected from Run III of 300 fbв€’1 are considered. The expected 95% CL limits on coefficients fT0/О›4, fT5/О›4, fM0/О›4 and fM2/О›4 are obtained both in the classical way and in the way, where the corrections from background anomalous contributions are applied. Corrected one-dimensional limits from Z(ОЅОЅВЇ)Оіjj and W(в„“ОЅ)Оіjj productions are up to 9.1% and 4.4% (depending on the operator) tighter than the classical ones, respectively. Corrected combined limits are up to 3.0% (depending on the operator) tighter than the classical ones. Corrections to two-dimensional limits are also obtained. The corrected contours are more stringent compared with the classical ones, and the maximal improvement is 17.2%.
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Semushin, A. E. Study of Corrections for Anomalous Coupling Limits Due to the Possible Background BSM Contributions / Semushin, A.E., Soldatov, E.Y. // Symmetry. - 2022. - 14. - № 10. - 10.3390/sym14102082
URI
https://www.doi.org/10.3390/sym14102082
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https://openrepository.mephi.ru/handle/123456789/27450
https://www.scopus.com/record/display.uri?eid=2-s2.0-85140800311&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000873887300001
https://openrepository.mephi.ru/handle/123456789/27450