Results from DASP one + e ? annihilation between 3.1 and 5.2 GeV

Brandelik, R.; Braunschweig, W.; Martyn, H. U.; Sander, H. G.; Schmitz, D.; Sturm, Walter; Wallraff, W.; Cords, D.; Felst, R.; Fries, Rainer J.; Gadermann, E.; Hultschig, H.; Joos, P.; Koch, W.; Kötz, U.; Krehbiel, H.; Kreinick, D. L.; Lynch, H. L.; McNeely, W.A.; Mikenberg, G.; Moffeit, K. C.; Notz, D.; Schliwa, Manfred; Shapira, A.; Wiik, B. H.; Wolf, G.; Ludwig, J.; Mess, K. H.; Petersen, A.; Poelz, G.; Ringel, Jeanne S.; Römer, O.; Rüsch, R.; Sauerberg, K.; Schmüser, Peter; Boer, W. De; Buschhorn, G.; Fues, W.; Gagern, C. von; Grindhammer, G.; Gunderson, B.; Kotthaus, R.; Lierl, H.; Oberlack, H.; Orito, S.; Suda, T.; Totsuka, Y.; Yamada, Shoichi

doi:10.1007/bf01440224

Cited by 57 publications

(8 citation statements)

References 20 publications

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“…The term "Measured value" is used because the value of the product obtained in this way may differ from the true value due to interference with the nonresonant process e + e − → K + K − , as discussed below. The quoted systematic uncertainty includes the uncertain- [3,30,31] 0.71 ± 0.05 [11] …”

Section: Detection Efficiencymentioning

confidence: 99%

“…For J/ψ → K + K − there are several measurements [3,30,31] in the e + e − → K + K − reaction, and one measurement [18] in which J/ψ's were produced in the ψ(2S) → J/ψπ + π − decay. To compare with the e + e − measurements, we calculate the average of the results [3,30,31], and obtain the value (2.43±0.26)×10 . Our result is larger than this average by 2.7 standard deviations.…”

Section: Detection Efficiencymentioning

confidence: 99%

“…(11), we use the average of the existing measurements [3,18,30,31] The coefficient |κ| in Eqs. (11) is equal to the ratio of the neutral-and charged-kaon form factors |F K 0 /F K |.…”

Section: Detection Efficiencymentioning

confidence: 99%

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Study of thee+e−→K+K−reaction in the energy range from 2.6 to 8.0 GeV

Lees¹,

Poireau²,

Tisserand³

et al. 2015

Phys. Rev. D

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The e + e − → K + K − cross section and charged-kaon electromagnetic form factor are measured in the e + e − center-of-mass energy range (E) from 2.6 to 8.0 GeV using the initial-state radiation technique with an undetected photon. The study is performed using 469 fb −1 of data collected with the BABAR detector at the PEP-II e + e − collider at center-of-mass energies near 10.6 GeV. The form factor is found to decrease with energy faster than 1/E 2 , and approaches the asymptotic QCD prediction. Production of the K + K − final state through the J/ψ and ψ(2S) intermediate states is observed. The results for the kaon form factor are used together with data from other experiments to perform a model-independent determination of the relative phases between electromagnetic (singlephoton) and strong amplitudes in J/ψ and ψ(2S) → K + K − decays. The values of the branching fractions measured in the reaction e + e − → K + K − are shifted relative to their true values due to interference between resonant and nonresonant amplitudes. The values of these shifts are determined to be about ±5% for the J/ψ meson and ±15% for the ψ(2S) meson.

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Section: Detection Efficiencymentioning

confidence: 99%

Section: Detection Efficiencymentioning

confidence: 99%

See 1 more Smart Citation

Study of thee+e−→K+K−reaction in the energy range from 2.6 to 8.0 GeV

Lees¹,

Poireau²,

Tisserand³

et al. 2015

Phys. Rev. D

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“…In Table II the errors are listed with the statistical and systematic errors combined in quadrature, together with results from previous investigations by DASP [15], BES [7,16], and CLEO [8]. The uncertainties in our branching fractions results are factors two to five smaller than those in the published results.…”

Section: Event Selectionmentioning

confidence: 62%

“…In the DASP [15] and BES [6] measurements no attempt was made to subtract the continuum contribution. In our published paper [8] with 3 million ψ(2S) (corresponding to integrated luminosity Ldt = 5.6 pb −1 ), only 11 π + π − counts were observed.…”

Section: Event Selectionmentioning

confidence: 99%

Phase difference between the electromagnetic and strong amplitudes forψ(2S)andJ/ψdecays into pairs of pseudoscalar mesons

et al. 2012

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Using the data for 24.5 × 10 6 ψ(2S) produced in e + e − annihilations at √ s = 3686 MeV at the CESR-c e + e − collider and 8.6 × 10 6 J/ψ produced in the decay ψ(2S) → π + π − J/ψ, the branching fractions for ψ(2S) and J/ψ decays to pairs of pseudoscalar mesons, π + π − , K + K − , and KSKL, have been measured using the CLEO-c detector. We obtain branching fractions B(ψ(2S) → π + π − ) = (7.6 ± 2.5 ± 0.6) × 10 −6 , B(ψ(2S) → K + K − ) = (74.8 ± 2.3 ± 3.9) × 10 −6 , B(ψ(2S) → KSKL) = (52.8 ± 2.5 ± 3.4) × 10 −6 , and B(J/ψ → π + π − ) = (1.47 ± 0.13 ± 0.13) × 10 −4 , B(J/ψ → K + K − ) = (2.86 ± 0.09 ± 0.19) × 10 −4 , B(J/ψ → KSKL) = (2.62 ± 0.15 ± 0.14) × 10 −4 , where the first errors are statistical and the second errors are systematic. The phase differences between the amplitudes for electromagnetic and strong decays of ψ(2S) and J/ψ to 0 −+ pseudoscalar pairs are determined by a Monte Carlo method to be δ(ψ(2S)P P = (110.5 +16.0 −9.5 ) • and δ(J/ψ)P P = (73.5 +5.0 −4.5 ) • . The difference between the two is ∆δ ≡ δ(ψ(2S))P P − δ(J/ψ)P P = (37.0 +16.5 −10.5 ) • .

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