Observation of diffraction excitation in pp → (pπ+π?)+X at the CERN-ISR and tests of limiting fragmentation |
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Authors: | L Baksay A Boehm H Foeth A Staude W Lockman M Medinnis T Meyer J Rander P Schlein T Trippe R Webb R Ellis B Naroska P Strolin |
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Institution: | III. Physikalisches Institut der Technischen Hochschule Aachen, Germany;CERN, Geneva, Switzerland |
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Abstract: | In a single-arm magnetic spectrometer experiment at the CERN Intersecting Storage Rings (ISR), a prominent diffractive enhancement is observed for inclusive production of (pπ+π?) systems near x ~ 1 at √s = 53 and 35 GeV. In testing limiting fragmentation and scaling for this system, inclusive pπ+π? diffractive excitation into a fixed invariant mass range is found to possess a cross-section independent of s to within (3 ± 5)%. The main component in the (pπ+π?) system is Δ(1236)π, with a charge structure compatible with the break-up of an isotopic spin system. |
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