Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session W04: MiniSymposium: Lattice QCD Inputs for BSM SearchesMiniSymposium Recordings Available

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Sponsoring Units: DNP Chair: Sergey Syritsyn, Stony Brook University (SUNY) Room: Salon 2 
Monday, April 11, 2022 5:45PM  6:21PM 
W04.00001: Lattice QCD Inputs for BSM Searches Invited Speaker: Phiala E Shanahan I will give an overview of recent progress in lattice QCD studies relevant to searches for physics beyond the Standard Model. In the precision era of lattice QCD for singlehadron systems, calculations with complete systematic control are playing an important role in precision tests of the Standard Model; I will discuss examples including tensions in heavy flavour physics, the recent lattice QCD calculations of key contributions to muon g2, and determinations of the quark masses and strong coupling which complement experimental studies at the LHC. In contrast to the precision of lattice QCD for single hadron systems, for light nuclear systems we are in the very early era of first reliable lattice QCD calculations. As a result, there is also an important and emerging role for lattice QCD in the interpretation of lowenergy precision experiments. In this arena, I will outline how the interplay of lattice QCD with effective field theories is providing improved predictions with impact spanning from neutrino physics experiments to direct searches for dark matter. 
Monday, April 11, 2022 6:21PM  6:33PM 
W04.00002: Nuclear Effective Theory of μ→e Conversion Evan J Rule The coming decade promises exceptional experimental progress in tests of charged lepton flavor violation (CLFV), with branching ratio sensitivities for μ→e conversion searches expected to improve by more than four orders of magnitude due to efforts at Fermilab (Mu2E) and JPARC (COMET). To support this progress, significant theoretical advances are required in order to connect lowenergy tests of μ→e conversion to candidate UV theories of CLFV. Here we describe an effective theory of μ→e conversion formulated at the nonrelativistic nucleon level which represents the most general constraint that this process can place on the underlying CLFV operators and provides the foundation to match onto effective theories at higher scales. This formulation provides a clear factorization of the CLFV physics from the nuclear physics (in analogy with standardmodel processes like β decay and μ capture), delineating what can and cannot be learned about CLFV operator coefficients from elastic μ→e conversion. Using stateoftheart shell model wave functions, we derive bounds on operator coefficients from existing μ→e conversion and μ→eγ results, and estimate the improvement in these bounds if Mu2e, COMET, and MEG II reach their design goals. 
Monday, April 11, 2022 6:33PM  6:45PM 
W04.00003: FiniteVolume Pionless Effective Field Theory for FewNucleon Systems with Differentiable Programming William Detmold, Phiala E Shanahan, Di Luo, Xiangkai Sun Finitevolume pionless effective field theory is an efficient framework with which to perform the extrapolation of finitevolume lattice QCD calculations of multinucleon spectra and matrix elements to infinite volume and to nuclei with larger atomic number. In this contribution, a new implementation of this framework based on correlated Gaussian wavefunctions optimized using differentiable programming and using a solution of a generalised eigenvalue problem is discussed. This approach is found to be more efficient than previous stochastic implementations of the variational method, as it yields comparable representations of the wavefunctions of nuclei with atomic number A <= 6 with an order of magnitude fewer terms.Future applications to infinitevolume extrapolations of nuclear matrix elemetns will also be discussed. 
Monday, April 11, 2022 6:45PM  6:57PM 
W04.00004: Uncertainty quantification in pionless effective field theory Jason Bub, Maria Piarulli, Saori Pastore Effective field theories (EFTs) offer a rigorous connection of quantum chromodynamics to the low energy regime of nuclear structure and interactions. While highquality effective interactions have been produced that can successfully replicate experimental data, they suffer from the same shortcoming that plagues much of theoretical nuclear physics: a lack of error estimation. Currently, EFT models have been used in calculations with rudimentary uncertainty quantification, but rigorous and systematic treatments are still missing. To remedy this, we have introduced an implementation of Markov Chain Monte Carlo (MCMC) for EFT parameter estimation. The parameter estimation is then propagated to calculations of observables. Further, treatment of uncertainty from the truncation of the EFT is also included for a more complete examination of the error. 
Monday, April 11, 2022 6:57PM  7:09PM 
W04.00005: Quantum Monte Carlo calculations of electroweak observables Garrett B King, Saori Pastore, Maria Piarulli Experiments searching for neutrinoless double beta (0νββ) decay and measuring beta decay spectra will address important questions within fundamental symmetries. To interpret new physics signals, these experiments require an accurate treatment of the underlying nuclear dynamics. Quantum Monte Carlo (QMC) methods allow one to solve the manybody Schrödinger equation while retaining the full complexity of the stronglycorrelated nuclear system. Recently, QMC calculations using the Norfolk two and threenucleon chiral interaction and its set of consistent one and twobody electroweak current operators have been validated with experimental data for beta decay and muon capture. In this talk, I will discuss using QMC methods with the Norfolk model to make predictions of the ^{6}He beta decay spectrum and A=6 0νββ decay matrix elements. Using the various Norfolk model classes, we estimate the error on these observables arising from different choices in constructing the chiral interaction. 
Monday, April 11, 2022 7:09PM  7:21PM 
W04.00006: Ab initio theory for heavy nuclei and the physics of neutrinos Jason D Holt

Monday, April 11, 2022 7:21PM  7:33PM 
W04.00007: Lattice QCD results for Kaon electromagnetic form factor up to Q^{2} ∼ 10 GeV^{2} HengTong Ding, Xiang Gao, Andrew D Hanlon, Swagato Mukherjee, Philipp Scior, Qi Shi, Sergey Syritsyn, Yong Zhao Electromagnetic form factor, especially its asymptotic behavior for large momentum transfer (Q^{2}), of kaon provides crucial insight into the partonic structure of a NambuGoldstone boson in strong interaction. Studies of the electromagnetic form factor of kaon up to Q^{2} ∼ 6 GeV^{2} are underway at the ongoing JLab12 experiment, and its measurements in an extended range of Q^{2} ∼ 9 – 30 GeV^{2} are planned at the future Electron Ion Collider (EIC). For the first time, we will present results for the kaon electromagnetic form factor in the range of Q^{2} ∼ 2 – 10 GeV^{2} from stateoftheart lattice QCD calculations carried out using physical values of up, down and strange quark masses. These results will provide benchmark QCD predictions for modelbased studies and the experimental measurements, in particular at the boundaries between the JLab12 and the EIC. 
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