<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi>p</mml:mi></mml:math>interactions at 205 GeV/<i>c</i>: Multiplicities of charged and neutral particles; production of neutral particles

Ljung, D.; Bogert, D.; Hanft, R.; Huson, F. R.; Kahn, S. J.; Pascaud, C.; Pruss, S.; Smart, W.; Bingham, H. H.; Chew, D.M.; Daugéras, B.; Fretter, W. B.; Goldhaber, G.; Graves, W.; Johnson, A. D.; Kadyk, J. A.; Stutte, L.; Trilling, G. H.; Winkelmann, F.C.; Yost, G.P.

doi:10.1103/physrevd.15.3163

Cited by 27 publications

(7 citation statements)

References 33 publications

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“…Numerous studies have been made (see [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], and references therein) including fixed-target experiments at Center-of-Mass (CM) energies up to 40 GeV, mainly with bubble chambers, as well as at CERN's Intersecting Storage Ring in the 1970s and early 1980s (see [21][22][23][24]) and later at the SPS Collider [25]. More recently, studies of strangeness production at a CM energy of 200 GeV in both proton-proton and deuterongold collisions at RHIC have been published [26,27].…”

Section: Introductionmentioning

confidence: 99%

V0 production in p+A collisions at $\sqrt{s}=41.6$ GeV

Abt¹,

Adams²,

Agari³

et al. 2009

Eur. Phys. J. C

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Inclusive doubly differential cross sections d 2 σ pA /dx F dp 2 T as a function of Feynman-x (x F ) and transverse momentum (p T ) for the production of K 0 S , Λ andΛ in proton-nucleus interactions at 920 GeV are presented. The measurements were performed by HERA-B in the negative x F range (−0.12 < x F < 0.0) and for transverse momenta up to p T = 1.6 GeV/c. Results for three target materials: carbon, titanium and tungsten are given. The ratios of production cross sections are presented and discussed. The Cronin effect is clearly observed for all three V 0 species. The atomic number dependence is parameterized as σ pA = σ pN · A α where σ pN is the proton-nucleon cross section. The measured values of α are all near one. The results are compared with EPOS 1.67 and PYTHIA 6.3. EPOS reproduces the data to within ≈ 20% except at very low transverse momentum. a

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Section: Introductionmentioning

confidence: 99%

V0 production in p+A collisions at $\sqrt{s}=41.6$ GeV

Abt¹,

Adams²,

Agari³

et al. 2009

Eur. Phys. J. C

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“…The inclusive cross section for K ~ production in 205 GeV/c ?l'.-P interactions is 3.74 ± 0.24 rnb (Ljung, 1977). The K~ yield, predicted on the basis of this cross section and the acceptance determined above, was compared with that observed in the UHI (interaction trigger) data.…”

Section: B2 Neutral Vee Reconstructionmentioning

confidence: 91%

Strange Quark Suppression in 225-GeV/c $\pi^-$ Beryllium Interactions

Schoessow

1983

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“…At the COMPASS beam momentum of 190 GeV/c, which corresponds to a center-of-momentum energy √ s of approximately 19 GeV, the total π − p cross section is approximately 24 mb [87,88] (see also Fig. 18), whereas the elastic π − p cross section is only about 3 mb [89,90]. This means that most of the scattering processes are inelastic.…”

Section: Production Of Excited Light Mesons At Compassmentioning

confidence: 99%

“…In this paper, we report on the ηπ p, η π p, and π − π − π + p final states. For the process π − + p → π − π − π + p, for example, a total cross section of 635 ± 61 µb was measured at a similar beam energy of 205 GeV [91], which corresponds to 18 ± 2 % of the total 4-prong cross section 38 of about 3.5 mb [89] and to about 2.6 % of the total cross section.…”

Section: Production Of Excited Light Mesons At Compassmentioning

confidence: 99%

Light-Meson Spectroscopy with COMPASS

Ketzer,

Grube,

Ryabchikov

2019

Preprint

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Despite decades of research, we still lack a detailed quantitative understanding of the way quantum chromodynamics (QCD) generates the spectrum of hadrons. Precise experimental studies of the hadron excitation spectrum and the dynamics of hadrons help to improve models and to test effective theories and lattice QCD simulations. In addition, QCD seems to allow hadrons beyond the three-quark and quark-antiquark configurations of the constituent-quark model. These so-called exotic hadrons contain additional constituent (anti)quarks or excited gluonic fields that contribute to the quantum numbers of the hadron. Hadron spectroscopy is currently one of the most active fields of research in hadron physics. The COMPASS experiment at the CERN SPS is studying the excitation spectrum of light mesons, which are composed of up, down, and strange quarks. The excited mesons are produced via the strong interaction, i.e. by Pomeron exchange, by scattering a 190 GeV/c pion beam off proton or nuclear targets. On heavy nuclear targets, in addition the electromagnetic interaction contributes in the form of quasi-real photon exchange at very low four-momentum transfer squared. COMPASS has performed the most comprehensive analyses to date of isovector resonances decaying into ηπ, η π, or π − π − π + final states. In this review, we give a general and pedagogical introduction into scattering theory and the employed partial-wave analysis techniques. We also describe novel methods developed for the high-precision COMPASS data. The COMPASS results are summarized and compared to previous measurements. In addition, we discuss possible signals for exotic mesons and conclude that COMPASS data provide solid evidence for the existence of the manifestly exotic π 1 (1600), which has quantum numbers forbidden for a quark-model state, and of the a 1 (1420), which does not fit into the quark-model spectrum. By isolating the contributions from quasi-real photon exchange, COMPASS has measured the radiative widths of the a 2 (1320) and, for the first time, that of the π 2 (1670) and has tested predictions of chiral perturbation theory for the process π − + γ → π − π − π + .

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π−pinteractions at 205 GeV/c: Multiplicities of charged and neutral particles; production of neutral particles

Cited by 27 publications

References 33 publications

V0 production in p+A collisions at $\sqrt{s}=41.6$ GeV

V0 production in p+A collisions at $\sqrt{s}=41.6$ GeV

Strange Quark Suppression in 225-GeV/c $\pi^-$ Beryllium Interactions

Light-Meson Spectroscopy with COMPASS

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