Charm Physics Prospects at Belle II

Schwartz, A. J.

doi:10.22323/1.289.0042

Cited by 6 publications

(6 citation statements)

References 4 publications

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“…It is expected that future measurements by LHCb and Belle II will reduce the uncertainties on ΔM to 10% or less [9][10][11]. The interpretation of these results within the Standard Model starts with the leading electroweak contributions, shown in Fig.…”

Section: Theoretical and Phenomenological Backgroundmentioning

confidence: 99%

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Short-distance matrix elements for D0 -meson mixing from Nf=2+1 lattice QCD

et al. 2018

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We calculate in three-flavor lattice QCD the short-distance hadronic matrix elements of all five ΔC ¼ 2 four-fermion operators that contribute to neutral D-meson mixing both in and beyond the Standard Model. We use the MILC Collaboration's N f ¼ 2 þ 1 lattice gauge-field configurations generated with asqtadimproved staggered sea quarks. We also employ the asqtad action for the valence light quarks and use the clover action with the Fermilab interpretation for the charm quark. We analyze a large set of ensembles with pions as light as M π ≈ 180 MeV and lattice spacings as fine as a ≈ 0.045 fm, thereby enabling good control over the extrapolation to the physical pion mass and continuum limit. We obtain for the matrix elements in theMS-NDR scheme using the choice of evanescent operators proposed by Beneke et al., evaluated at 3 GeV, hD 0 jO i jD 0 i ¼ f0.0805ð55Þð16Þ; −0.1561ð70Þð31Þ; 0.0464ð31Þð9Þ; 0.2747ð129Þð55Þ; 0.1035ð71Þð21Þg GeV 4 (i ¼ 1-5). The errors shown are from statistics and lattice systematics, and the omission of charmed sea quarks, respectively. To illustrate the utility of our matrix-element results, we place bounds on the scale of CP-violating new physics in D 0 mixing, finding lower limits of about 10-50 × 10 3 TeV for couplings of Oð1Þ. To enable our results to be employed in more sophisticated or model-specific phenomenological studies, we provide the correlations among our matrix-element results. For convenience, we also present numerical results in the other commonly used scheme of Buras, Misiak, and Urban.

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Section: Theoretical and Phenomenological Backgroundmentioning

confidence: 99%

“…Our results agree with previous N f ¼ 2 and N f ¼ 2 þ 1 þ 1 lattice-QCD calculations from the European Twisted Mass (ETM) Collaboration using twisted-mass fermions [5,8] and have uncertainties commensurate with the projected experimental error on the mass difference ΔM [defined in Eq. (2.2)] from the LHCb and Belle II experiments [9][10][11].…”

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confidence: 99%

Short-distance matrix elements for D0 -meson mixing from Nf=2+1 lattice QCD

et al. 2018

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“…With 50 times more data obtained through upgrades to the KEK accelerator facility, Belle II will continue with charmed baryon spectroscopy. With data taking under way, it should precisely measure line-shapes, map out resonances, search for new decay channels and test predictions for hitherto unobserved states [9]. Exciting QCD and hadron physics program at the Jefferson Laboratory unravel the internal structure of ground and excited state mesons and baryons in terms of their electromagnetic and tranition form factors [10][11][12].…”

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confidence: 99%

Masses of light and heavy mesons and baryons: A unified picture

et al. 2019

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We compute masses of positive parity spin-1/2 and 3/2 baryons composed of u, d, s, c and b quarks in a quark-diaquark picture. The mathematical foundation for this analysis is implemented through a symmetry-preserving Schwinger-Dyson equations treatment of a vector-vector contact interaction, which preserves key features of quantum chromodynamics, such as confinement, chiral symmetry breaking and low energy Goldberger-Treiman relations. This study requires a computation of diquark correlations containing these quarks which in turn are readily inferred from solving the Bethe-Salpeter equations of the corresponding mesons. Therefore, it serves as a unified formalism for a multitude of mesons and baryons. It builds on our previous works on the study of masses, decay constants and form factors of quarkonia and light mesons, employing the same model. We use two sets of parameters, one which remains exactly the same for both the light and heavy sector hadrons, and another where the coupling strength is allowed to evolve according to the available mass scales of quarks. Our results are in very good agreement with the existing experimental data as well as predictions of other theoretical approaches whenever comparison is possible.

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“…from LHCb or BESIII (see e.g. [7]) and there is much more to come from Belle II [8], the LHC-upgrade [9], BESIII [10] and PANDA [11].…”

Section: Introductionmentioning

confidence: 99%