Observation of vector meson production in inclusive pp reactions

Blobel, V.; Fesefeldt, H.; Fränz, H.; Hellwig, B.; Idschok, U.; Lämsä, J.; Mönkemeyer, D.; Neumann, H.; Roedel, D.; Schrankel, W.; Schwarz, Benjamin; Selonke, F.; Söding, P.

doi:10.1016/0370-2693(74)90462-6

Cited by 128 publications

(38 citation statements)

References 16 publications

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“…54, the range 0.6 < m e + e − < 0.76GeV/c 2 was excluded from the fit. ii) The ρ/ω ratio, which is known to be close to unity in pp collisions at this energy (Blobel et al, 1974), is here ρ/ω < 0.15 and < 0.31 for C and Cu targets, respectively (95% C.L. ).…”

Section: E325 Results On the ρ/ω Mesonsmentioning

confidence: 99%

“…(ii) E325 and CBELSA/TAPS disagree on the ω width: While an ω width broadening was not observed by the E325 experiment, CBELSA/TAPS found an 12 Note that the ρ/ω ratio in the pp collisions at the KEK energy is about unity (Blobel et al, 1974), while that in the γp collisions at the CLAS energy is about 3 to 1 (Barth et al, 2003;Erbe et al, 1968;Wu et al, 2005), which may account for the bulk of the difference found in Fig. 66.…”

Section: Vector Mesonsmentioning

confidence: 99%

“…A more recent analysis of 40 Ca(γ, ππ), with higher statistics by Bloch et al (2007), shown in Fig. 34, revealed that the invariant-mass spectra show a similar (Roca et al, 2002).…”

Section: Tapsmentioning

confidence: 99%

“…This approach has been generalized to attack the problems of hadron properties in the hot/dense medium (Bochkarev and Shaposhnikov, 1986;Hatsuda et al, 1993;Hatsuda and Lee, 1992), and further theoretical elaborations were made (Asakawa and Ko, 1993;Jin and Leinweber, 1995;Klingl et al, 1997;Koike and Hayashigaki, 1997;Leupold et al, 1998;Ruppert et al, 2006). A major difference of the inmedium QSR from the in-vacuum QSR is that there arise Lorentz-tensor condensates.…”

Section: Qcd Sum Rulesmentioning

confidence: 99%

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Hadron properties in the nuclear medium

2010

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The QCD vacuum shows the dynamical breaking of chiral symmetry. In the hot/dense QCD medium, the chiral order parameter such as qq is expected to change as function of temperature T and density ρ of the medium, and its experimental detection is one of the main challenges in modern hadron physics. In this article, we discuss theoretical expectations for the in-medium hadron spectra associated with partial restoration of chiral symmetry and the current status of experiments with an emphasis on the measurements of properties of mesons produced in nearground-state nuclei.

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Section: E325 Results On the ρ/ω Mesonsmentioning

confidence: 99%

Section: Vector Mesonsmentioning

confidence: 99%

“…A more recent analysis of 40 Ca(γ, ππ), with higher statistics by Bloch et al (2007), shown in Fig. 34, revealed that the invariant-mass spectra show a similar (Roca et al, 2002).…”

Section: Tapsmentioning

confidence: 99%

Section: Qcd Sum Rulesmentioning

confidence: 99%

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Hadron properties in the nuclear medium

2010

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“…The experimental observation of such phenomena has become one of the most interesting topics in hadron physics today. These values are much smaller than unity, the value previously measured in pp interactions at the same energy [3]. A detailed description of the E325 spectrometer can be found elsewhere [1].…”

Section: Introductionmentioning

confidence: 72%

Medium Modi cation on Vector Mesons Observed in 12 GeV p + A Reactions

Naruki

En’yo

Muto

et al. 2006

AIP Conference Proceedings

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Experimental study of the e+e− → π+π−π0 reaction by SND detector in the energy range s = 0.42 - 1.38 GeV AIP Conf.Abstract. The invariant mass spectra of e + e − pairs produced in 12 GeV p+A reactions are measured at the KEK-PS. We observed a significant enhancement over the known hadronic sources on the low-mass side of the ω meson peak. The 95 % C.L. allowed parameter regions for ρ/ω ratio are obtained as ρ/ω < 0.15 and ρ/ω < 0.31 for C and Cu targets, respectively. As for the φ meson, the data obtained with a Cu target revealed a significant excess on the low-mass side of the φ meson peak mainly in the β γ φ < 1.25 region.

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Resonance Production and Correlations of Neutral and Charged Pions

1978

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A b s t r a c t . The influence of the production of the meson resonances e,f and Q on semi-inclusive no multiplicities and nOnO correlations is investigated in a Correlated J e t Model (CJM) for resonance production besides direct pion production. The model takes into account an exact global isospin conservation provided by a coherent state projection procedure and the local isospin conservation at the re8onance decay vertices. The resulting semi-inclusive no multiplicity (no)rr, yields a sufficient description of the data a t FXAL energies. This quantity is decomposed in the modcl into contributions from direct no production and from no coming from the decay of the different resonanms. Furthcrmore, the predictions of the CJM for the semiinclusive xOnO correlation coefficient is given and found t o be consistent with present data. Resonanzproduktion und Korrolatmionen zwischen goladenon und neutralen x-MesonenI n h a l t s i i b e r s i c h t . I n einem korreliertcn J e t Modell (CJM), dw ncben direkter Erzeugung von n-Mesonen die Produktion von Resonanzen beriichiehtigt, wird der EinflnO der mesonischen Resonanzen e,f und o auf semiinklusive d' Multiplizitiiten und zOno Korrelationen untersucht. Das Modell enthllt durch Projektion koharenter Zustinde cine exakte globale IRospinerhaltung nnd lokale Isoapinerhaltung an den Resonanzzerfallsvertizes. Die resultierenden semiinklnsiven no Multiplizitiiten

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Observation of vector meson production in inclusive pp reactions

Cited by 128 publications

References 16 publications

Hadron properties in the nuclear medium

Hadron properties in the nuclear medium

Medium Modi cation on Vector Mesons Observed in 12 GeV p + A Reactions

Resonance Production and Correlations of Neutral and Charged Pions

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