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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1986, vol. 178, p. 447-451

Inclusive η production at low transverse momentum in 63 GeV ppcollisions at the cern intersecting storage rings

Åkesson T., Albrow M. G., Almehed S., Anassontzis E., Batley R., Benary O., Bøggild H., Botner O., Breuker H., Burkert V., Callen B., Carosi R., Carter A. A., Carter J. R., Cecil P. C., Chernyatin V., Choi Y., Cleland W. E., Dagan S., Dahl-Jensen E., Dahl-Jensen I., Dam P., Damgaard G., Dolgoshein B., Eidelman S., Evans W. M., Fabjan C. W., Frankel S., Frati W., Gavrilenko I., Goerlach U., Goloubkov Y., Gordon H., Hansen K. H., Hedberg V., Jarlskog G., Jensen T., Kalinovsky A., Kanteserov V., Katsanevas S., Kourkoumelis C., Kroeger R., Kulka K., Lissauer D., Lörstad B., Mannelli I., Markou A., Mayburov S., McCubbin N. A., Mjörnmark U., Møller R., Molzon W., Nevsky P., Nielsen B. S., Olsen L. H., Oren Y., Piskounov G., Resvanis L. K., Rudge A., Schukraft J., Shmeleva A., Sidorov V., Specht H., Stumer I., Sullivan M., Thodberg H. H., Thompson J. A., Thorstenson G., Vasilev P., Vella E., Williamson J., Willis W. J., Winik M., Woody C., Zajc W. A.

The inclusive production of η-mesons in pp collisions at √s=63 GeV and θ{symbol}CM=90° has been measured for pT<1.5GeV/c. The η/π ratio decreases from its previously measured asymptotic value of η/π ∼ 0.5 at high transverse momentum, to η/π ≈0.3 at PT = 750 MeV/c and η/π ≈ 0.01 at PT=300 MeV/c, in a way that consistent with phase-space considerations, e.g. mT scaling. The η/π ratio, integrated from 0.2-1.5 GeV/c, is found to be η/π=0.07±0.055. © 1986.