Measurement of thee + e −→π + π − π 0 ande + e −→ωπ + π − reactions in the energy interval 1350–2400 MeV

Antonelli, A.; Baldini, R.; Biagini, M.E.; Calcaterra, S.; Schioppa, M.; Bisello, D.; Busetto, G.; Castro, Asier Pereiro; Nigro, M.; Pescara, L.; Sartori, P.; Stančo, L.; Augustin, J. E.; Ayach, L.; Cosme, G.; Couchot, F.; Fulda, F.; Grosdidier, G.; Jean‐Marie, B.; Lepeltier, V.; Szklarz, G.

doi:10.1007/bf01589702

Cited by 55 publications

(16 citation statements)

References 15 publications

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“…III it is clear that the cross section of the process e þ e À ! þ À 0 obtained by BABAR (Aubert et al, 2004b) is consistent with that of SND (Achasov et al, 2002) below ffiffi ffi s p ¼ 1:4 GeV, but is much higher than that at DM2 (Antonelli et al, 1992) above this energy. The energy dependence of the cross section observed by DM2 is also inconsistent with other measurements [see the discussion of this problem by Achasov et al (2002)] and the existence of the rather well-established !ð1420Þ and !ð1650Þ resonances.…”

Section: Some Implications For Theory and Perspectivessupporting

confidence: 88%

“…23). The cross section below 1.4 GeV is in agreement with the SND measurement (Achasov et al, 2002), but at higher energies a large deviation from the DM2 results (Antonelli et al, 1992) is observed. The cross section in this region is fitted (see the inset in Fig.…”

Section: A Overviewsupporting

confidence: 79%

“…The e þ e À ! þ À cross section measured by BABAR (Aubert et al, 2007c) in comparison with the direct e þ e À measurements (Druzhinin et al, 1986;Antonelli et al, 1992;Akhmetshin et al, 2000). significantly larger.…”

Section: A Overviewmentioning

confidence: 94%

“…The solid curve shows "dL=dm for the B factory (2E 0 ¼ 10:58 GeV, L ¼ 500 fb À1 , tagged ISR photon), while the dashed curve shows the same function for the factory (2E 0 ¼ 1:02 GeV, L ¼ 240 pb À1 , untagged ISR photon). The histogram represents integrated luminosities collected in direct e þ e À experiments with the SND detector (Achasov et al, 2002) at the Novosibirsk VEPP-2M collider (below 1:4 GeV=c 2 ), and with the DM1 (Bisello et al, 1981) and DM2 (Antonelli et al, 1992) detectors at the Orsay DCI collider (above 1:4 GeV=c 2 ). masses below 0:8 GeV=c 2 the luminosity currently used for ISR analysis (Ambrosino et al, 2009) is comparable with that collected in direct e þ e À experiments.…”

Section: Isr Luminositymentioning

confidence: 99%

“…þ À and þ À intermediate states. The cross sections for these reactions were measured in direct e þ e À experiments (Cordier et al, 1981;Druzhinin et al, 1986;Antonelli et al, 1988Antonelli et al, , 1992Akhmetshin et al, 2000), but BABAR data are significantly more accurate. The e þ e À !…”

Section: A Overviewmentioning

confidence: 99%

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Hadron production viae+e−collisions with initial state radiation

et al. 2011

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A novel method of studying e þ e À annihilation into hadrons using initial state radiation at e þ e À colliders is described. After a brief history of the method, its theoretical foundations are considered. Numerous experiments in which exclusive cross sections of e þ e À annihilation into hadrons below the center-of-mass energy of 5 GeV have been measured are presented. Some applications of the experimental results to fundamental tests of the standard model are listed.

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Section: Some Implications For Theory and Perspectivessupporting

confidence: 88%

Section: A Overviewsupporting

confidence: 79%

Section: A Overviewmentioning

confidence: 94%

Section: Isr Luminositymentioning

confidence: 99%

Section: A Overviewmentioning

confidence: 99%

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Hadron production viae+e−collisions with initial state radiation

et al. 2011

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Hadronic contributions to (g?2) of the leptons and to the effective fine structure constant ?(M Z 2 )

Eidelman

Jegerlehner

1995

Z. Phys. C - Particles and Fields

492

701

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The new experiment planned at Brookhaven to measure the anomalous magnetic moment of the muon a µ ≡ (g µ − 2)/2 will improve the present accuracy of 7 ppm by about a factor of 20. This requires a careful reconsideration of the theoretical uncertainties of the g −2 predictions, which are dominated by the error of the contribution from the light quarks to the photon vacuum polarization. This issue is crucial also for the precise determination of the running fine structure constant at the Z-peak as LEP/SLC experiments continue to increase their precision. In this paper we present an updated analysis of the hadronic vacuum polarization using all presently available e + e − data. This seems to be justified because previous work on the subject was based to some extent on preliminary or incomplete experimental data. Contributions from different energy ranges are presented separately for g −2 of the muon and the τ -lepton and for α(M 2 Z ). We obtain the results a had * µ = (725±16)×10 −10 and a had * τ = (351 ± 10) × 10 −8 , where the asterisk indicates the dressed (renormalization group improved) value. For the effective fine structure constant at M Z = 91.1888 GeV we obtain ∆α (5) had = 0.0280 ± 0.0007 and α(M 2 Z ) −1 = 128.896 ± 0.090. Further improvement in the accuracy of theoretical predictions which depend on the hadronic vacuum polarization requires more precise measurements of e + e − cross-sections at energies below about 12 GeV in future experiments.

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