Dimuon Production by Neutrons

Открытие J-Частицы (Личные Впечатления)

“…Ли, Пиплз, О'Хэллоран с сотрудниками *) 28 -29 смогли обнаружить /-частицу в процессе фоторождения на ядрах в фотонном пучке с энергией ·--100 Гэв. Они показали, что фоторождение / имеет много общего с фоторождением р, и, таким образом, впервые установили, что / есть сильно взаимодей-ствующая частица.…”

Limit on Production of Charmed Particles in Association with theJ

“…If the event had a third muon which was consistent with a common production vertex for all three muons, the event was a candidate for Reactions (2) or (3). Each muon track was required to satisfy all of the cuts defined in Ref.…”

“…In this instance we assumed that the two J's were produced independently with (1 -x) 5,2 rapidity distributions. We again required the sum of x ¥ for the two par-ticles to be less than 0.7.…”

“…l2 We note several important systematic effects on Shortly after the original discovery of the J particle, 1 it was shown that the cross section for hadronic production of the J increased by more than two orders of magnitude between alternating-gradient synchrotron (AGS) energies (~ 30 GeV) and Fermilab energies (~300 GeV). 2 One possible explanation of this increase is that the major mechanism for J production by hadrons is the Okubo-Zweig-Iizuka (OZI)-rule-allowed 3 reaction:…”

“…Possible support for this mechanism comes from recent observations of an excess of K's in hadronic production of the cp meson. 4 We have tested this hypothesis by searching for the leptonic or semileptonic decays of charmed particles produced in association with a J particle as in Reaction (2). The J was produced in neutron-nuclear collisions at Fermilab (average neutron energy about 300 GeV), and detected through its dimuon decay mode.…”