Search For Up-Down Quark Mass Differences Via Isospin Symmetry Breaking

H Machner,S Abdel-Samad,J Bojowald, A Budzanowski,A Chatterjee,J Ernst, D Frekers,W Garske,P Hawranek,J Ilieva,R Jahn, L Jarczyk,K Kilian, D Kirillov,S Kliczewski,W Klimala,D Kolev,M Kravcikova,T Kutsarova, J Lieb,A Magiera,G Martinska, H Nann,L Pentchev,N Piskunov,D Protic,P Von Rossen,Bj Roy,I Sitnik, R Siudak,M Ulicny, A Strzalkowski,R Tsenov,J Urban,K Zwoll

Progress in Particle and Nuclear Physics（2003）

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摘要

Abstract We performed a series of experiments employing the two pion production reactions p + d → 3 He + π 0 and p + d → 3 H + π + . The two isopin related reactions differ by a Clebsch Gordan coefficient of 2. We searched for deviations in this ratio in complete angular distributions in the range of the Δ excitation as well as in the vicinity of the η production threshold.

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关键词

quark mass differences,isospin symmetry,up-down

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