Nuclear Theory·nucl-th

Tuesday·June 2, 2020

18 papers—12 primary·6 cross-listed

13
Effects of Longitudinal Short-Distance Constraints on the Hadronic Light-by-Light Contribution to the Muon $g - 2$
Jan Lüdtke🇦🇹 · Massimiliano Procura🇦🇹
We present a model-independent method to estimate the effects of short-distance constraints (SDCs) on the hadronic light-by-light contribution to the muon anomalous magnetic moment $a_{μ}^{HLbL}$ . The relevant loop integral is evaluated using multi-parameter families of interpolation functions, which satisfy by construction all constraints derived from general principles and smoothly connect the low-energy region with those where either two or all three independent photon virtualities become large. In agreement with other recent model-based analyses, we find that the SDCs and thus the infinite towers of heavy intermediate states that are responsible for saturating them have a rather small effect on $a_{μ}^{HLbL}$ . Taking as input the known ground-state pseudoscalar pole contributions, we obtain that the longitudinal SDCs increase $a_{μ}^{HLbL}$ by $(9.1 \pm 5.0) \times 1 0^{- 11}$ , where the isovector channel is responsible for $(2.6 \pm 1.5) \times 1 0^{- 11}$ . More precise estimates can be obtained with our method as soon as further accurate, model-independent information about important low-energy contributions from hadronic states with masses up to 1-2 GeV become available.
↳ hep-phnucl-thEPJC(2020)·69 citations
14
First Measurement of Differential Charged Current Quasielastic-like $ν_{μ}$ -Argon Scattering Cross Sections with the MicroBooNE Detector
P. Abratenko · M. Alrashed · R. An · J. Anthony · J. Asaadi · A. Ashkenazi · S. Balasubramanian · B. Baller · C. Barnes · G. Barr · V. Basque · L. Bathe-Peters and 172 other authors
We report on the first measurement of flux-integrated single differential cross sections for charged-current (CC) muon neutrino ( $ν_{μ}$ ) scattering on argon with a muon and a proton in the final state, $^{40}$ Ar( $ν_{μ}$ , $μ$ p)X. The measurement was carried out using the Booster Neutrino Beam at Fermi National Accelerator Laboratory and the MicroBooNE liquid argon time projection chamber detector with an exposure of 4.59 $\times$ 10 $^{19}$ protons on target. Events are selected to enhance the contribution of CC quasielastic (CCQE) interactions. The data are reported in terms of a total cross section as well as single differential cross sections in final state muon and proton kinematics. We measure the integrated per-nucleus CCQE-like cross section (i.e. for interactions leading to a muon, one proton and no pions above detection threshold) of (4.93 $\pm$ 0.76stat $\pm$ 1.29sys) $\times$ 10 $^{- 38}$ cm $^{2}$ , in good agreement with theoretical calculations. The single differential cross sections are also in overall good agreement with theoretical predictions, except at very forward muon scattering angles that correspond to low momentum-transfer events.
↳ hep-exhep-phnucl-exnucl-thPRL(2020)·87 citations
15
Analysis of the QCD Kondo phase using random matrices
Takuya Kanazawa🇯🇵
We propose a novel random matrix model that describes the QCD Kondo phase. The model correctly implements both the chiral symmetry of light quarks and the SU(2) spin symmetry of heavy quarks. We analytically take the large-N limit with N the matrix size and show that the model has three phases: the pure Kondo phase with no chiral condensate, the pure chirally broken phase with no Kondo condensate, and the coexistence phase. The model predicts that the pairing form of the Kondo condensate in the coexistence phase is significantly altered compared to the pure Kondo phase. For each phase, we rigorously derive the low-energy effective theory of Nambu-Goldstone modes and obtain compact closed expressions for the partition function with external sources. We also include a chiral chemical potential into the model and examine the vacuum structure.
↳ hep-thhep-lathep-phnucl-thMod.Phys.Lett.A(2026)·8 citations
16
Quark level and hadronic contributions to the electric dipole moment of charged leptons in the standard model
Yasuhiro Yamaguchi🇯🇵 · Nodoka Yamanaka🇺🇸
We evaluate the electric dipole moment of charged leptons in the standard model, where the complex phase of the Cabibbo-Kobayashi-Maskawa matrix is the only source of CP violation. We first prove that, at the quark-gluon level, it is suppressed by a factor of $m_{b}^{2} m_{c}^{2} m_{s}^{2}$ at all orders of perturbation due to the Glashow-Iliopoulos-Maiani mechanism. We then calculate the hadronic long distance contribution generated by vector mesons at one-loop level. The $∣Δ S ∣ = 1$ weak hadronic interaction is derived using the factorization, and the strong interaction is modeled by the hidden local symmetry framework. We find that the electric dipole moments of charged leptons obtained from this hadronic mechanism are much larger than the perturbative four-loop level quark-gluon process, by several orders of magnitude.
↳ hep-phhep-exnucl-thPRD(2021)·83 citations
17
$d^{*} (2380)$ dibaryon from lattice QCD
Shinya Gongyo🇯🇵 · Kenji Sasaki🇯🇵 · Takaya Miyamoto🇯🇵 · Sinya Aoki🇯🇵 · Takumi Doi🇯🇵 · Tetsuo Hatsuda🇯🇵 · Yoichi Ikeda🇯🇵 · Takashi Inoue🇯🇵 · Noriyoshi Ishii🇯🇵
The $ΔΔ$ dibaryon resonance $d^{*} (2380)$ with $(J^{P}, I) = (3^{+}, 0)$ is studied theoretically on the basis of the 3-flavor lattice QCD simulation with heavy pion masses ( $m_{π} = 679, 841$ and $1018$ MeV). By using the HAL QCD method, the central $Δ$ - $Δ$ potential in the $^{7} S_{3}$ channel is obtained from the lattice data with the lattice spacing $a ≃ 0.121$ fm and the lattice size $L ≃ 3.87$ fm. The resultant potential shows a strong short-range attraction, so that a quasi-bound state corresponding to $d^{*} (2380)$ is formed with the binding energy $25$ - $40$ MeV below the $ΔΔ$ threshold for the heavy pion masses. The tensor part of the transition potential from $ΔΔ$ to $N N$ is also extracted to investigate the coupling strength between the $S$ -wave $ΔΔ$ system with $J^{P} = 3^{+}$ and the $D$ -wave $N N$ system. Although the transition potential is strong at short distances, the decay width of $d^{*} (2380)$ to $N N$ in the $D$ -wave is kinematically suppressed, which justifies our single-channel analysis at the range of the pion mass explored in this study.
↳ hep-lathep-exhep-phnucl-ex+1PLB(2020)·25 citations
18
Structure and tidal deformability of a hybrid star within the framework of the field correlator method
S. Khanmohamadi🇮🇷 · H. R. Moshfegh🇮🇷 · S. Atashbar Tehrani🇮🇷
The structure of hybrid stars within the nonperturbative framework of the field correlator method, extended to zero-temperature limit as a quark model, has been studied. For the hadronic sector, we have used the lowest-order constraint variational method by employing AV18 two-body nucleon-nucleon interaction supplemented by the phenomenological Urbana-type three-body force. For an adapted value of the gluon condensate, G2 = 0:006 GeV4, which gives the critical temperature of about Tc ? 170 MeV, stable hybrid stars with a maximum mass of 2:04M? are predicted. The stability of hybrid star has been investigated for a wide range of gluon condensate value, G2, and quark-antiquark potential, V1. A hybrid equation of state fulfills the constraints on tidal deformability and hence on the radii of the stars, extracted from the binary GW170817. Moreover, tidal deformability for different chirp masses and different binary mass ratios of hybrid stars have been studied. The mass-radius relation satisfies the new constraint obtained from the neutron star interior composition explorer (NICER). A comprehensive analysis on the structure of a hybrid star and also its compactness, tidal Love number, and tidal deformability has been conducted for several parameter sets of the quark equation of state. The influence of different crustal equations of state on the mentioned quantities has been studied. Our calculations suggest the value of quark-antiquark potential, V1, to be around 0.08 GeV. The results achieved in this study are in strong concurrence with the other calculations reported on this subject.
↳ hep-phastro-ph.HEnucl-thPRD(2020)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE

Effects of Longitudinal Short-Distance Constraints on the Hadronic Light-by-Light Contribution to the Muon g−2

First Measurement of Differential Charged Current Quasielastic-like νμ​-Argon Scattering Cross Sections with the MicroBooNE Detector

Analysis of the QCD Kondo phase using random matrices

Quark level and hadronic contributions to the electric dipole moment of charged leptons in the standard model

d∗(2380) dibaryon from lattice QCD

Structure and tidal deformability of a hybrid star within the framework of the field correlator method

Affiliations

Effects of Longitudinal Short-Distance Constraints on the Hadronic Light-by-Light Contribution to the Muon $g - 2$

First Measurement of Differential Charged Current Quasielastic-like $ν_{μ}$ -Argon Scattering Cross Sections with the MicroBooNE Detector

$d^{*} (2380)$ dibaryon from lattice QCD