The Pion Electromagnetic Form-factor in the Timelike Energy Range 1.35-{GeV} $\le \sqrt{s} \le$ 2.4-{GeV}

The DM2 collaboration Bisello, D. ; Busetto, G. ; Castro, A. ; et al.
Phys.Lett.B 220 (1989) 321-327, 1989.
Inspire Record 267118 DOI 10.17182/hepdata.29829

The e + e − → π + π − cross section has been measured from about 280 events (an order of magnitude more than the previous world statistics) in the energy interval 1.35 ⩽ s ⩽ 2.4 GeV with the DM2 detector at DCI. The pion squared form factor | F π | 2 shows a deep minimum around 1.6 GeV/ c 2 and is better fit under the hypothesis of two ϱ-like resonance ⋍0.25 GeV/ c 2 wide with 1.42 and 1.77 GeV/ c 2 masses.

1 data table match query

Statistical errors only.


The time-like electromagnetic form factors of the charged pseudoscalar mesons from 1.44-GeV**2 to 9.0-GeV**2.

Bernardini, M. ; Bollini, D. ; Brunini, P.L. ; et al.
Phys.Lett.B 46 (1973) 261-264, 1973.
Inspire Record 85277 DOI 10.17182/hepdata.28063

The study of 620 hadron pairs produced in the s -range (1.44−9.0) GeV 2 , has yielded 110 collinear hadronic events. Their identification in terms of π and K mesons allows the determination of the time-like electromagnetic from factors of these pseudoscalar mesons in the above time-like range. The total number of (e + e − ) events observed in the same experimental conditions is 18 048.

1 data table match query

No description provided.


E+ e- annihilation into two hadrons in the energy interval 1400-2400 mev

Alles-Borelli, V. ; Bernardini, M. ; Bollini, D. ; et al.
Phys.Lett.B 40 (1972) 433-436, 1972.
Inspire Record 75693 DOI 10.17182/hepdata.28268

The proof is given for the existence of the reaction e + e − → h ± h ∓ in the energy range 1400–2400 MeV, and its energy dependence is compared with that of e + e − → e ± e ∓ , in the same experimental conditions of observation. The exponent of the s -dependence of the ratio α = (e + e − → h ± h ∓ )/ (e + e − → e ± e ∓ ) is measured to be n = 2.08 ± 0.45, in the s -range (1.96 − 5.76) GeV 2 , on the basis of 51 e + e − → h ± h ∓ events and 8918 e + e − → e ± e ∓ events observed.

1 data table match query

CROSS SECTION FOR PRODUCTION OF CHARGED HADRON PAIRS.


Search for rho Like Vector Mesons in the Mass Range 1.2-GeV to 3.0-GeV

Bollini, D. ; Giusti, P. ; Massam, T. ; et al.
Lett.Nuovo Cim. 15 (1976) 393, 1976.
Inspire Record 100567 DOI 10.17182/hepdata.37442

None

1 data table match query

No description provided.


The Pion Electromagnetic Form-Factor in the Timelike Range 1.44-GeV**2-9.0-GeV**2

Bollini, D. ; Giusti, P. ; Massam, T. ; et al.
Lett.Nuovo Cim. 14 (1975) 418, 1975.
Inspire Record 100180 DOI 10.17182/hepdata.37445

None

1 data table match query

No description provided.


Hadron pair production by electron-positron colliding beams

Barbiellini, G. ; Grilli, M. ; Iarocci, E. ; et al.
Lett.Nuovo Cim. 6S2 (1973) 557-565, 1973.
Inspire Record 86306 DOI 10.17182/hepdata.37335

None

1 data table match query

THIS HADRON PAIR CROSS SECTION PROVIDES ONLY AN UPPER LIMIT TO THE PION FORM FACTOR ABOVE 1.5 GEV SINCE KAON PRODUCTION IS NOT DISTINGUISHED.