Study of intranuclear collision effects in interactions ofK +/π + mesons with Al and Au nuclei at 250 GeV/c

Agababyan, N. M.; Ajinenko, I.; Botterweck, F.; Charlet, M.; Chliapnikov, P.; DeWolf, E. A.; Dziunikowska, K.; Endler, A. M. F.; Gulkanyan, G.R.; Hakobyan, R.; Karamyan, J.K.; Kittel, W.; Kisielewska, D.; Levchenko, B. B.; Megrabyan, S. S.; Olkiewicz, K.; Rizatdinova, F.; Shabalina, L.; Verbeure, F.; Wischnewski, R.

doi:10.1007/bf01565944

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…In the following years, further central production data from the WA76 and WA102 experiments at CERN confirmed the f 1 (1420) axial vector dominance, decaying to K * K +c.c., and excluded a 0 −+ contribution in the 1.4-1.5 GeV/c 2 mass region [74][75][76][77][78]. These data are coherent with the experimental observation of the suppression of pseudoscalar signals in central production [74,[79][80][81].…”

Section: Hadroproductionsupporting

confidence: 78%

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The case of the pseudoscalar glueball

Masoni

Cicalò

Usai

2006

J. Phys. G: Nucl. Part. Phys.

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Glueballs represent a key requirement of quantum chromodynamics as a non-Abelian field theory. Their search provides one of the strongest motivations for meson spectroscopy. The first glueball candidate was identified in 1980 in the J/Ψ radiative decay. Its discovery actually dates back to 1963 and for four decades about 30 experiments, using six different production mechanisms, were dedicated to studying the pseudoscalar states lying in the 1.4–1.5 GeV/c2 mass region. Today, the presence of two pseudoscalar states and an axial vector can be considered as established (see 2004 edition of the Review of Particle Properties). Assuming that η(1295) is established and the nonet filled, the lower mass pseudoscalar, η(1405), becomes a supernumerary and shows the properties of a non- state. Here, we review the experimental effort related to this long search, which can be considered a sort of paradigm for light-quark spectroscopy.

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Section: Hadroproductionsupporting

confidence: 78%

“…A possible small pseudoscalar contribution was considered in one of the earlier WA76 analyses [34] but was later excluded [74][75][76][77][78]. These results are consistent with the hypothesis that pseudoscalars do not couple to double pomeron exchange [11,80].…”

Section: Towards a Coherent Frameworksupporting

confidence: 63%

The case of the pseudoscalar glueball

Masoni

Cicalò

Usai

2006

J. Phys. G: Nucl. Part. Phys.

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Backward proton production in ?+ andK + collisions with Al and Au nuclei at 250 GeV/c

Agababyan¹,

Ajinenko

Atayan³

et al. 1995

Z. Phys. C - Particles and Fields

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EC guest scientist, now at DESY, Hamburg production is estimated.An upper limit of the cross section for the colour-charge-exchange mechanism of backward proton of the secondary pion absorption can be fitted by a power dependence ot AB, with [3 = 0.27 dz 0.05.by a nucleon pair in the nuclear medium, 1r+(pn) -» *5 p and 1r°(pp) -> *5 p. It is found that the share (44:t6)% for Au) of the backward proton production can be attributed to secondary pion absorption angles. From the two-proton correlations, it is found, that a significant part ((2614)% for Al and and Au nuclei at 250 GeV/c. The proton momentum spectra are measured at different emission Abstract. Backward proton production is studied in interactions of 7r+ and K + mesons with Al not a candidate for a quasi-elastic or coherent interaction with the nucleus. The events are weighted OCR Output vertex is within one of the nuclear foils; the event is satisfactorily measured and reconstructed and isThe following selection criteria are used for the events (see details in [16,17]): the interaction was estimated visually on the scanning table.spectrometer. For reconstructed tracks with lab momentum pm, < 1.2 GeV/c, the ionization strength 2% for tracks reconstructed in the bubble chamber and from 1 to 2.5% for those reconstucted in the measurement in RCBC. The average momentum resolution for charged particles varies from 1 to backward tracks (i.e. tracks with a lab. frame production angle 0],,,, > 900) are reconstructed from from hits in the wire and drift chambers of the spectrometer and from measurement in RCBC. The Tracks of secondary charged particles, leaving RCBC through the exit window, are reconstructed window of the chamber.length. The foils were placed side by side, orthogonally to the beam, 15.5 cm behind the entrance gold foil of thickness 2.5 mm and 0.64 mm, respectively, corresponding to 0.5 % of an interaction cylinder axis. The RCBC was equipped with two nuclear targets consisting of an aluminium and a vertex and track detector, as well as an ionization device. A 2T magnetic field was applied along the A rapid cycling bubble chamber RCBC, 80 cm in diameter and filled with hydrogen, was used asThe experimental set-up of EHS is described in detail in [13], the data reduction procedure in [14][15][16]. (253:8)% and (1718)%, respectively [3]. The second class are two (or multi)-step mechanisms of this mechanism has experimentally been estimated for 1xNe and 17Ne -interactions and found to be (or more) nucleons or multiquark compositions in the nucleus (see e.g. [1,2]). The contribution of distinguished. The first one is a "direct" (spectator type) mechanism of projectile collision with two in which two or more nucleons of the nucleus are involved. Two classes of these processes can be takes place on a free nucleon. Selecting on backward protons, one therefore can select processes

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