Electroweak sphaleron with dimension-six operators

Gan, Xucheng; Long, Andrew J.; Wang, Lian-Tao

doi:10.1103/PhysRevD.96.115018

Title: Electroweak sphaleron with dimension-six operators

Journal Article · 21 December 2017 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.96.115018 · OSTI ID:1595706

Gan, Xucheng ^[1]; Long, Andrew J. ^[2]; Wang, Lian-Tao ^[3]

Univ. of Chicago, IL (United States). Enrico Fermi Inst.
Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics
Univ. of Chicago, IL (United States). Enrico Fermi Inst. and Kavli Inst. for Cosmological Physics

New physics at the TeV scale can affect the dynamics of the electroweak phase transition in many ways. In this paper, we evaluate its impact on the rate of baryon-number violation via sphaleron transitions. We parameterize the effect of new physics with dimension-6 operators, and we use the Newton-Kantorovich method to numerically solve the resulting equations of motion. Depending on the sign of the coefficient of the dimension-6 operators, their presence can either increase or decrease the sphaleron energy at the level of a few percent, parametrically of order m$$2\atop{W}$$/Λ² where Λ is the scale suppressing the dimension-6 operator. Lastly, the baryon-number washout condition, typically written as v_c/T_c>1, is directly proportional to the sphaleron energy, and we discuss how the presence of dimension-6 operators can affect electroweak baryogenesis.

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Research Organization:: Univ. of Chicago, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)

Grant/Contract Number:: SC0009924; SC0013642; PHY-1125897

OSTI ID:: 1595706

Alternate ID(s):: OSTI ID: 1414513

Journal Information:: Physical Review D, Vol. 96, Issue 11; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 22 works

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