Observation of a Hybrid Spin Resonance

Bai, Mei; Allgower, C.; Ahrens, L.; Alessi, J.; Brown, K.; Bunce, G.; Cameron, P.; Chu, C. M.; Courant, E. D.; Glenn, J.W.; Huang, H.; Jeon, D.; Kponou, A.; Krueger, K.; Luccio, A.; Makdisi, Y. I.; Lee, S. Y.; Ratner, L. G.; Reece, Kimberly S.; Roser, T.; Spinka, H. M.; Syphers, M.; Tsoupas, N.; Underwood, D. G.; Asselt, W. van; Williams, N.; Yokosawa, A.

doi:10.1103/physrevlett.84.1184

Cited by 17 publications

(16 citation statements)

References 10 publications

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“…The biggest impact on our determination comes from the region below 2 GeV, where the R-ratio is compiled from very many carefully measured exclusive-channel contributions. While much improved inclusive data in the region between 2 and 3 GeV have more recently become available [16][17][18], we found that, at present, these inclusive data do not have much impact on the precision of our determination. In this respect, prospects for the release of new inclusive R-ratio data by BESIII [43] and the experiments at Novosibirsk (SND, CMD-3, KEDR) are potentially promising.…”

Section: Discussionmentioning

confidence: 66%

“…These contributions to ρ EM (s) are suppressed by a factor of (m 2 s − m 2 l ) 2 /(N c s 2 ), the fourth order mass dependence arising because two mass insertions are required in each of the disconnected loops if the loop integral is to survive after the sum over all of u, d and s running around the loop is performed. 16 We observe that the first three resonances are nearly degenerate, and have approximately equal width over mass ratios (except the ω(782), for which the width is restricted by phase space).…”

Section: Duality Violationsmentioning

confidence: 78%

“…The symbol (γ) indicates that the hadronic final state is inclusive of final-state radiation 4. See, for instance, Refs [16][17][18],. in particular,Table 3in Ref [17]…”

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confidence: 99%

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Strong coupling from e+e−→hadrons below charm

et al. 2018

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We use a new compilation of the hadronic R-ratio from available data for the process e + e − → hadrons to determine the strong coupling, α s . We make use of all data for the R-ratio from threshold to a center-of-mass energy of 2 GeV by employing finite-energy sum rules. Data above 2 GeV, for which at present far fewer high-precision experimental data are available, do not provide much additional constraint but are fully consistent with the values for α s we obtain. Quoting our results at the τ mass to facilitate comparison to the results obtained from analogous analyses of hadronic τ -decay data, we find α s (m 2 τ ) = 0.298 ± 0.016 ± 0.006 in fixed-order perturbation theory, and α s (m 2 τ ) = 0.304 ± 0.018 ± 0.006 in contour-improved perturbation theory, where the first error is statistical, and the second error reflects our estimate of various systematic effects. These values are in good agreement with a recent determination from the OPAL and ALEPH data for hadronic τ decays.

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Section: Discussionmentioning

confidence: 66%

Section: Duality Violationsmentioning

confidence: 78%

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Strong coupling from e+e−→hadrons below charm

et al. 2018

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“…This is because Y(4260) is totally different from the predicted ψ(4S ) since the widths of Y(4260) and predicted ψ(4S ) are quite different from each other, i.e., Y(4260) is a broad state with the width 120 ± 12 MeV [30], while the predicted ψ(4S ) have a narrow width as indicated in Ref. [6], which can be the reason why the predicted ψ(4S ) is not described in the analysis of the open-charm decay channels [38][39][40][41][42] and the R value scan [43][44][45][46][47][48][49][50].…”

Section: Conlcusions and Discussionmentioning

confidence: 99%

Observation ofe+e−→χc0ωand missing higher char

2015

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Stimulated by the recent BESIII observation of a new resonance in e + e − → ωχ c0 which is consistent with our predicted ψ(4S ), we estimate the meson loop contribution to ψ(4S ) → ωχ c0 in this work. The evaluation indicates that our theoretical estimate can overlap with the experimental data in a reasonable parameter range. This fact shows that introduction of the missing higher charmonium ψ(4S ) provides a possible explanation to the recent BESIII observation. The upper limit of a branching ratio of ψ(4S ) → ηJ/ψ is also predicted to be 1.9 × 10 −3 , which can be further tested by BESIII, Belle and forthcoming BelleII.

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“…as accurate measurement of the τ lepton mass [3,4], accurate measurement of the Z resonance parameters [5,6,7,7], and so forth. Thirdly, scan measurement can add a lot to understand the present theory, such as R-value measurement [8,9] and phase angle measurement [10], both of which are crucial for quantum chromodynamics researches.…”

Section: Introductionmentioning

confidence: 99%

Theory of second optimization for scan experiment

2015

Int. J. Mod. Phys. A

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In many high energy experiments, the physics quantities are obtained by measuring the cross sections at a few energy points over an energy region. This was referred to as scan experiment. The optimal design of the scan experiment (how many energy points, what the energies are, and what is the luminosity at each energy point) is of great significance both for scientific research and from economical viewpoint. Two approaches, one has recourse to the sampling technique and the other resorts to the analytical proof, are adopted to figure out the optimized scan scheme for the relevant parameters. The final results indicate that for n parameters scan experiment, n energy points are necessary and sufficient for optimal determination of these n parameters; each optimal position can be acquired by single parameter scan (sampling method), or by analysis of auxiliary function (analytic method); the luminosity allocation among the points can be determined analytically with respect to the relative importance between parameters. By virtue of the second optimization theory established in this paper, it is feasible to accommodate the perfectly optimal scheme for any scan experiment.

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Observation of a Hybrid Spin Resonance

Cited by 17 publications

References 10 publications

Strong coupling from e+e−→hadrons below charm

Strong coupling from e+e−→hadrons below charm

Observation ofe+e−→χc0ωand missing higher char

Theory of second optimization for scan experiment

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