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General Neutrino Interactions, Dark Matter, and Electroweak Phase Transition

Liu, Hongkai (2021) General Neutrino Interactions, Dark Matter, and Electroweak Phase Transition. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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This thesis consists of several projects in two major directions: (1) neutrino non-standard interactions and (2) weakly interacting massive particle (WIMP) as cold dark matter (DM). In the neutrino physics studies, we work on searching general neutrino interactions (GNI) at both high-energy experiments, such as (HL -) LHC, LHeC, and low-energy experiments, like COHERENT. We consider GNI arose from two different scenarios. One is from a UV-complete flavored Z model. Another one is in the Standard Model Effective Field Theory framework extended with right-handed neutrinos N (SMNEFT) framework. Along the line of the SMNEFT, we present the gauge coupling terms of the one-loop anomalous dimen-sion matrix for renormalization group evolution (RGE) of the Wilson coefficients between a new physics scale and the electroweak scale. We calculate the Yukawa coupling contri-butions to the one-loop anomalous dimension matrix for the 11 dimension-six four-fermion SMNEFT operators. We also present the new contributions to the anomalous dimension matrix for the 14 four-fermion SMEFT operators that mix with the SMNEFT operators through the Yukawa couplings of the right-handed neutrinos. In the DM aspect, we work on a WIMP scenario with vanishingly small tree-level spin-independent (SI) scattering cross-sections. To thoroughly probe interesting and well-motivated WIMP scenarios, we calculate the electroweak corrections to the SI scattering amplitude at the tree-level blind spot from the next-to-leading-order (NLO). It is observed that in a significant region of the singlet-doublet model-space, the one-loop corrections “unblind” the tree-level blind spots and lead to detectable SI scattering rates at future multi-ton scale liquid Xenon experiments. We consider another WIMP DM candidates in a non-Abelian dark SU(2)D model where the dark sector couples to the Standard Model (SM) through a Higgs portal. We utilize the ex-isting collider results of the Higgs signal rate, direct heavy Higgs searches, and electroweak precision observables to constrain the model parameters. The resulting two stable massive dark gauge bosons and pseudo-Goldstone bosons from symmetry breaking can be viable cold DM candidates. We study in detail the pattern of strong first-order phase transition and gravitational wave (GW) production triggered by the dark sector symmetry breaking.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Liu, Hongkaihol42@pitt.eduhol420000-0002-9322-7487
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairHan,
Committee MemberBatell,
Committee MemberBoudreau,
Committee MemberLiu,
Committee MemberRothstein,
Date: 8 October 2021
Date Type: Publication
Defense Date: 29 April 2021
Approval Date: 8 October 2021
Submission Date: 23 July 2021
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 173
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Physics
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Neutrino physics, dark matter, gravitational wave, electroweak phase transition, effective field theory.
Date Deposited: 08 Oct 2021 19:25
Last Modified: 08 Oct 2021 19:25

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