Criegee, L.
GAMMA GAMMA --> PI+ PI-
Cross Section
[0.0, 1.0]
Max results
Sort by Reverse order

Showing 3 of 3 results

rivet Analysis
Exclusive production of pion and kaon meson pairs in two photon collisions at LEP.

The ALEPH collaboration Heister, A. ; Schael, S. ; Barate, R. ; et al.
Phys.Lett.B 569 (2003) 140-150, 2003.
Inspire Record 626022 DOI 10.17182/hepdata.49730

Exclusive production of π and K meson pairs in two photon collisions is measured with ALEPH data collected between 1992 and 2000. Cross-sections are presented as a function of cos θ ∗ and invariant mass, for | cos θ ∗ |<0.6 and invariant masses between 2.0 and 6.0 GeV/ c 2 (2.25 and 4.0 GeV/ c 2 ) for pions (kaons). The shape of the distributions are found to be well described by QCD predictions but the data have a significantly higher normalization.

4 data tables
Table 1

Measured angular distribution for pion production.

Table 2

Measured angular distribution for kaon production.

Table 3

Measured cross section for pion production as a function of W.

More…

rivet Analysis
An Experimental study of the process gamma gamma ---> pi+ pi-

The CELLO collaboration Behrend, H.J. ; Criegee, L. ; Field, J.H. ; et al.
Z.Phys.C 56 (1992) 381-390, 1992.
Inspire Record 345437 DOI 10.17182/hepdata.14534

Using the CELLO detector, we have measured cross sections for the processγγ→π+π− in the mass range 0.75–1.9 GeV/c2. A partial wave fit to the data indicates the presence of a sizeableS-wave amplitude with signs of resonant behaviour. Values for the γγ width of thef2(1270) are given, showing the model-dependence of this quantity. At higher dipion masses, the model of Brodsky and Lepage is found to give an order of magnitude description of the data.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


rivet Analysis
Two photon production of pion pairs

Boyer, J. ; Butler, F. ; Gidal, G. ; et al.
Phys.Rev.D 42 (1990) 1350-1367, 1990.
Inspire Record 304882 DOI 10.17182/hepdata.22881

We present a new high-statistics measurement of the cross section for the process e+e−→e+e−π+π− at a center-of-mass energy of 29 GeV for invariant pion-pair masses M(π+π−) between 350 MeV/c2 and 1.6 GeV/c2. We observe the f2(1270) and measure its radiative width to be 3.15±0.04±0.39 keV. We also observe an enhancement in the π+π− spectrum near 1 GeV. General agreement is found with unitarized models of the γγ→π+π− reaction that include final-state interactions.

2 data tables
Table 1

No description provided.

Table 2

Statistical errors only.