Non-decoupling new particles

Banta, Ian; Cohen, Timothy; Craig, Nathaniel; Lu, Xiaochuan; Sutherland, Dave

doi:10.1007/jhep02(2022)029

Title: Non-decoupling new particles

Journal Article · 02 February 2022 · Journal of High Energy Physics (Online)

DOI: https://doi.org/10.1007/jhep02(2022)029 · OSTI ID:1854927

Banta, Ian ^[1]; Cohen, Timothy ^[2]; Craig, Nathaniel ^[3]; Lu, Xiaochuan ^[2]; Sutherland, Dave ^[4]

University of California, Santa Barbara, CA (United States)
University of Oregon, Eugene, OR (United States)
University of California, Santa Barbara, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
Istituto Nazionale di Fisica Nucleare (INFN), Trieste (Italy)

We initiate the study of a new class of beyond the Standard Model states that we call “Loryons.” They have the defining characteristic of being non-decoupling, in the sense that their physical mass is dominated by a contribution from the vacuum expectation value of the Higgs boson. The stakes are high: the discovery of a Loryon would tell us that electroweak symmetry must be non-linearly realized in the effective field theory of the Standard Model. Loryons have their masses bounded from above by perturbative unitarity considerations and thus define a finite parameter space for exploration. After providing a complete catalog of Loryon representations under mild assumptions, we turn to examining the constraints on the parameter space from Higgs couplings measurements, precision electroweak tests, and direct collider searches. We show that most fermionic candidates are already ruled out (with some notable exceptions), while much of the scalar Loryon parameter space is still wide open for discovery.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Oregon, Eugene, OR (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-05CH11231; SC0011640

OSTI ID:: 1854927

Journal Information:: Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 2 Vol. 2022; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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