Remarks on the Standard Model predictions for 
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Kim, C. S.; López-Castro, G.; Tostado, S. L.; Vicente, Avelino

doi:10.1103/physrevd.95.013003

Cited by 22 publications

(24 citation statements)

References 72 publications

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“…We note that these predictions are compatible with ours at the 1σ level. Finally, the possible pollution of R(D * ) from B * pole contributions has been found to be negligible [62].…”

Section: Acknowledgmentsmentioning

confidence: 93%

Scalar contributions to b→c(u)τν transitions

et al. 2017

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We perform a comprehensive analysis of scalar contributions in b → cτ ν transitions including the latest measurements of R(D ( * ) ), the q 2 differential distributions in B → D ( * ) τ ν, the τ polarization asymmetry for B → D * τ ν, and the bound derived from the total width of the Bc meson. We find that scalar contributions with the simultaneous presence of both left-and right-handed couplings to quarks can explain the available data, specifically R(D ( * ) ) together with the measured differential distributions. However, the constraints from the total Bc width present a slight tension with the current data on B → D * τ ν in this scenario, preferring smaller values for R(D * ). We discuss possibilities to disentangle scalar new physics from other new-physics scenarios like the presence of only a left-handed vector current, via additional observables in B → D ( * ) τ ν decays or additional decay modes like the baryonic Λ b → Λcτ ν and the inclusive B → Xcτ ν decays. We also analyze scalar contributions in b → uτ ν transitions, including the latest measurements of B → τ ν, providing predictions for Λ b → pτ ν and B → πτ ν decays. The potential complementarity between the b → u and b → c sectors is finally investigated once assumptions about the flavour structure of the underlying theory are made.

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“…We note that these predictions are compatible with ours at the 1σ level. Finally, the possible pollution of R(D * ) from B * pole contributions has been found to be negligible [62].…”

Section: Acknowledgmentsmentioning

confidence: 93%

Scalar contributions to b→c(u)τν transitions

et al. 2017

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“…First, experimental and theoretical studies of PAHs clearly demonstrate the importance of PAH charge (Szczepanski & Vala 1993;Hudgins et al 1994;Langhoff 1996;Kim et al 2001;Hudgins et al 2004, and ref. therein).…”

Section: The Infrared Emission Features and Pahsmentioning

confidence: 98%

The PAH Emission Characteristics of the Reflection Nebula NGC 2023

Peeters

Bauschlicher

Allamandola

et al. 2017

ApJ

101

223

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We present 5-20 µm spectral maps of the reflection nebula NGC 2023 obtained with the Infrared Spectrograph SL and SH modes on board the Spitzer Space Telescope which reveal emission from polycyclic aromatic hydrocarbons (PAHs), C 60 , and H 2 superposed on a dust continuum. We show that several PAH emission bands correlate with each other and exhibit distinct spatial distributions revealing a spatial sequence with distance from the illuminating star. We explore the distinct morphology of the 6.2, 7.7 and 8.6 µm PAH bands and find that at least two spatially distinct components contribute to the 7-9 µm PAH emission in NGC 2023. We report that the PAH features behave independently of the underlying plateaus. We present spectra of compact oval PAHs ranging in size from C 66 to C 210 , determined computationally using density functional theory, and investigate trends in the band positions and relative intensities as a function of PAH size, charge and geometry. Based on the NASA Ames PAH database, we discuss the 7-9 µm components in terms of band assignments and relative intensities. We assign the plateau emission to very small grains with possible contributions from PAH clusters and identify components in the 7-9 µm emission that likely originates in these structures. Based on the assignments and the observed spatial sequence, we discuss the photochemical evolution of the interstellar PAH family as they are more and more exposed to the radiation field of the central star in the evaporative flows associated with the PDRs in NGC 2023.

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“…All the predicted materials listed in Table I are strictly crossingnodal-line semimetals with an extremely tiny energy gap (< 2 meV) at a general band crossing point P (induced by HITs of k) 19,38 . Without SOC effect, all the candidates listed in Table I Metal hydrides have been studied extensively for superconductivity and metal-insulator transition under pressure [39][40][41] . YH 3 adopts the HoD 3 structure 42 having the space group P3c1 (No.…”

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confidence: 99%

Pseudo Dirac nodal sphere semimetal

et al. 2018

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Topological semimetals (TSMs) in which conduction and valence bands cross at zero-dimensional (0D) Dirac nodal points (DNPs) or 1D Dirac nodal lines (DNLs), in 3D momentum space, have recently drawn much attention due to their exotic electronic properties. Here we generalize the TSM state further to a higher-dimensional Dirac nodal sphere (DNS) or pseudo DNS (PDNS) state, with the band crossings forming a 2D closed or approximate sphere at the Fermi level. This new TSM state can exhibit unique electronic properties, making DNS/PDNS a new type of fermion beyond DNP/DNL paradigm. In the realistic crystals, we demonstrate two possible types of PDNS states underlied by different crystalline symmetries, which are characterized with a spherical backbone consisting of multiple DNLs and approximate band degeneracy in between the DNLs. We identify all the possible band crossings with pairs of 1D irreducible representations to form the PDNS states in 32 point groups. Importantly, we discover that strained M H3 (M = Y, Ho, Tb, Nd) and Si3N2 are materials candidates to realize these two types of PDNS states, respectively. As a high-symmetryrequired state, the PDNS semimetal can be regarded as the "parent phase" for other topological gapped and gapless states.

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Remarks on the Standard Model predictions for R(D) and R(D*

Cited by 22 publications

References 72 publications

Scalar contributions to b→c(u)τν transitions

Scalar contributions to b→c(u)τν transitions

The PAH Emission Characteristics of the Reflection Nebula NGC 2023

Pseudo Dirac nodal sphere semimetal

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