Measurement of the Total Cross Section for Hadronic Production by<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Annihilation at Energies between 2.6–5 GeV

Tong, G. L.; Varner, G.; Wang, F; Ls, Wang; Wang, M; Wang, Peixiao; Sm, Wang; Wang, TJ; Wang, Y-Y.; Wei, C.; Wu, N.; Wu, Y.; Xi, D. M.; Xia, X. M.; Xie, P. P.; Xie, Y.; Xu, G. F.; Xue, S.; Yan, Jun; Yan, W.; Yang, C.; Yang, H. X.

doi:10.1103/physrevlett.84.594

Cited by 141 publications

(86 citation statements)

References 22 publications

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“…Note added: a new more precise value of α from atomic interferometry with Cesium 133 has been obtained at the University of California Berkeley [75]: α −1 (Cs18) = 137.035999046 (27) giving an ae prediction ae = 0.00115965218157 (23) = deviation (a exp µ −a the µ )/a exp µ . Limiting theory precision: hadronic vacuum polarization (HVP) and hadronic light-by-light (HLbL) (see also [76]).…”

Section: Hadronic Light-by-light Contribution: Problems Resultsmentioning

confidence: 99%

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The Muon $g-2$ in Progress

Jegerlehner¹

2018

Acta Phys. Pol. B

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Two next generation muon g − 2 experiments at Fermilab in the US and at J-PARC in Japan have been designed to reach a four times better precision from 0.54 ppm to 0.14 ppm and the challenge for the theory side is to keep up in precision as far as possible. This has triggered a lot of new research activities. The main motivation is the persisting 3 to 4 σ deviation between standard theory and experiment. As Standard Model predictions almost without exception match perfectly all other experimental information, the deviation in one of the most precisely measured quantities in particle physics remains a mystery and inspires the imagination of model builders. Plenty of speculations are aiming to explain what beyond the Standard Model effects could fill what seems to be missing. Here very high precision experiments are competing with searches for new physics at the high energy frontier lead by the Large Hadron Collider at CERN. Actually, the tension is increasing steadily as no new states are found which could accommodate the g µ − 2 discrepancy. With the new muon g − 2 experiments this discrepancy would go up at least to 6 σ, in case the central values do not move, up to 10 σ could be reached if the present theory error could be reduced by a factor of two. Interestingly, the new α from Berkeley by R. H. Parker et al. Science 360, 191 (2018): α −1 (Cs18) = 137.035999046 (27) gives an a e prediction a e = 0.00115965218157(23) such that a exp e − a the e = (−84 ± 36) × 10 −14 shows a −2.3 σ deviation now.

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Section: Hadronic Light-by-light Contribution: Problems Resultsmentioning

confidence: 99%

“…Above 2 GeV fairly accurate BES-II data [27] are available. A new inclusive determination of R(s) in the range 1.84 to 3.72 GeV has been obtained with the KEDR detector at Novosibirsk [28] [37] [PdRV].…”

Section: Evaluation Of the Leading Order A Hadmentioning

confidence: 99%

The Muon $g-2$ in Progress

Jegerlehner¹

2018

Acta Phys. Pol. B

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“…at 90% C.L.. A puzzling phenomenon of the Y(4260) is that it is absent in the R value scan [137,138,139,140,129,141], which is the challenge to the traditional vector charmonium interpretation of the Y(4260). We note that the R value denotes the ratio of the rate of hadron production to that for muon pairs in the annihilation of e + e − pair, i.e., R = σ(e + e − → hadrons)/σ(e + e − → µ + µ − ).…”

Section: Its Open Charm Decay Modesmentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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In the past decade many charmonium-like states were observed experimentally. Especially those charged charmoniumlike Z c states and bottomonium-like Z b states can not be accommodated within the naive quark model. These charged Z c states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

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“…[47], which are collected in Table 5. 4 There are three main contributions to the moments: narrow resonances (which appear below threshold); threshold (with data collected by different experimental collaborations [52][53][54][55][56][57][58][59][60][61][62][63][64][65][66] up to energies of 10.538 GeV); and continuum, from 10.538 GeV to infinity, with no experimental data available. In Ref.…”

Section: Charm Vector Correlatormentioning

confidence: 99%

Precise determination of αs from relativistic quarkonium sum rules

Boito

Mateu

2020

J. High Energ. Phys.

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We determine the strong coupling α s (m Z ) from dimensionless ratios of roots of moments of the charm-and bottom-quark vector and charm pseudo-scalar correlators, dubbed R X,n q ≡ (M X,n q ) 1 n /(M X,n+1 q ) 1 n+1 , with X = V, P , as well as from the 0-th moment of the charm pseudo-scalar correlator, M P,0 c . In the quantities we use, the mass dependence is very weak, entering only logarithmically, starting at O(α 2 s ). We carefully study all sources of uncertainties, paying special attention to truncation errors, and making sure that orderby-order convergence is maintained by our choice of renormalization scale variation. In the computation of the experimental uncertainty for the moment ratios, the correlations among individual moments are properly taken into account. Additionally, in the perturbative contributions to experimental vector-current moments, α s (m Z ) is kept as a free parameter such that our extraction of the strong coupling is unbiased and based only on experimental data. The most precise extraction of α s from vector correlators comes from the ratio of the charm-quark moments R V,2 c and reads α s (m Z ) = 0.1168 ± 0.0019, as we have recently discussed in a companion letter. From bottom moments, using the ratio R V,2 b , we find α s (m Z ) = 0.1186 ± 0.0048. Our results from the lattice pseudo-scalar charm correlator agree with the central values of previous determinations, but have larger uncertainties due to our more conservative study of the perturbative error. Averaging the results obtained from various lattice inputs for the n = 0 moment we find α s (m Z ) = 0.1177 ± 0.0020. Combining experimental and lattice information on charm correlators into a single fit we obtain α s (m Z ) = 0.1170 ± 0.0014, which is the main result of this article.

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Measurement of the Total Cross Section for Hadronic Production bye+e−Annihilation at Energies between 2.6–5 GeV

Cited by 141 publications

References 22 publications

The Muon $g-2$ in Progress

The Muon $g-2$ in Progress

The hidden-charm pentaquark and tetraquark states

Precise determination of αs from relativistic quarkonium sum rules

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