Phenomenology 2023 Symposium

Session

BSM XI

May 9, 2023, 4:30 PM

Lawrence Hall 205

Conveners

BSM XI

• Joachim Brod (University of Cincinnati)

154. The role of dimension-8 operators in an EFT for the 2HDM

Dr Matthew Sullivan (Brookhaven National Laboratory)

5/9/23, 4:30 PM

BSM

The Standard Model effective field theory (SMEFT) is a standard tool for parametrizing the effects of new physics. The ordiinary approach to SMEFT is to use the truncation at dimension-6, which would typically be the leading contribution beyond the Standard Model. We perform the matching to dimension-8 in the two-Higgs-doublet model (2HDM) and critically examine the dimension-6 and dimension-8...

169. Modifying Froggatt Nielsen : An EFT approach

Arindam Bhattacharya

5/9/23, 4:45 PM

BSM

Froggatt Nielsen (FN) mechanism, when employed to explain the SM flavor hierarchy, introduces a systematic power counting for BSM physics couplings in the IR. While the power counting in the IR is generally robust to UV details, nonetheless there can be visible deviations from a naïve FN counting owing to specificities of the underlying UV model. In this work, we propose a systematic way to...

203. Flavor-changing light bosons with accidental longevity

Kunfeng Lyu (University of Minnesota)

5/9/23, 5:00 PM

BSM

We consider a model with a complex scalar field that couples to $(e,\mu)$ or $(\mu,\tau)$ within the ``longevity" window: $[|m_{l_1} - m_{l_2}|, m_{l_1} + m_{l_2}]$ in which $l_1$ and $l_2$ are the two different charged leptons. Within such a mass window, even a relatively large coupling ({\em e.g.} of the size commensurate with the current accuracy/discrepancy in the muon $g-2$ experiment)...

262. Lepton Flavor Specific Extended Higgs Models

Mr Matthew Knauss

5/9/23, 5:15 PM

BSM

In multi-Higgs models, a discrete symmetry in the quark sector is needed to avoid tree-level flavor-changing neutral currents. Although a similar symmetry is usually considered with the lepton sector, this symmetry is not necessary. We consider a multi-Higgs doublet model in which one Higgs doublet couples to quarks and three other doublets couple to the electron, muon and tau respectively....

217. Probing type-II seesaw mechanism in alternative U(1)$_X$ model

Ms PUJA DAS (Student)

5/9/23, 5:30 PM

BSM

We investigate a pair production of doubly-charged scalars ($\Delta^{\pm \pm}$)
at the High-Luminosity LHC in the recently proposed alternative U(1)$_X$ extension
of the Standard Model with the type-II seesaw mechanism. We focus on the $\Delta^{\pm \pm}$
production mediated by U(1)$_X$ gauge boson ($Z^\prime$) and find an enhancement of
the production cross section via $Z^\prime$ resonance...

114. Neutral-current SMEFT studies with EIC and LHeC DIS pseudo data

Chiara Bissolotti (Argonne National Laboratory)

5/9/23, 5:45 PM

BSM

We study the potential of DIS measurements at the Large Hadron-electron Collider (LHeC) and the Electron-Ion Collider (EIC) to probe physics beyond the Standard Model. Our study is performed in the context of the Standard Model Effective Field Theory (SMEFT). We find that future measurements at both machines can improve existing SMEFT fits to precision electroweak data by resolving blind spots...

111. Precision electroweak measurements and SMEFT studies at the EIC

Kaan Simsek

5/9/23, 6:00 PM

BSM

The EIC's high luminosity, wide kinematic coverage, availability of proton and isoscalar deuteron targets, and ability to polarize both the lepton and hadron beams, allows for unique opportunities for precision tests of the electroweak sector of the Standard Model and constraining beyond the Standard Model physics in a manner that complements efforts at the LHC and low energy experiments. In...

129. Resolving CDF-$W$ mass shift and CKM unitarity puzzle in Left-Right Symmetric Models with Universal Seesaw

Ritu Dcruz (Oklahoma State University)

5/9/23, 6:15 PM

BSM

We explore the possibility of resolving the $W$ mass shift observed by the CDF collaboration and the apparent deviation from unitarity in the first row of the CKM matrix simultaneously in a class of left-right symmetric models with universal seesaw. A unique non-trivial solution to the two anomalies was obtained, where the down quark mixing with vector-like quarks~(VLQ) resolves the CKM...