Cross-sections of large-angle hadron production in proton– and pion–nucleus interactions II: beryllium nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c

Bolshakova, Anastasia; Boyko, I. R.; Chelkov, G. A.; Dedovitch, D.; Elagin, A.; Gostkin, M. I.; Grishin, S. V.; Guskov, A.; Kroumchtein, Z.V.; Nefedov, Y.; Nikolaev, K.; Zhemchugov, A.; Dydak, F.; Wotschack, J.; Min, A. De; Ammosov, V. V.; Гапиенко, В. А.; Koreshev, V.; Semak, A.; Sviridov, Yu M.; Usenko, E.; Zaets, V. G.

doi:10.1140/epjc/s10052-009-1092-1

Cited by 18 publications

(31 citation statements)

References 307 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The nominal beam position 2 was at x beam = y beam = 0, however, excursions by several millimeters could occur. 3 A loose fiducial cut x 2 beam + y 2 beam < 12 mm ensured full beam acceptance.…”

Section: The T9 Proton and Pion Beams And The Targetmentioning

confidence: 99%

“…1 A smooth variation of beam intensity eases corrections for dynamic TPC track distortions. 2 A right-handed Cartesian and/or spherical polar coordinate system is employed; the z axis coincides with the beam line, with +z pointing downstream; the coordinate origin is at the upstream end of the copper target, 500 mm downstream of the TPC's pad plane; looking downstream, the +x coordinate points to the left and the +y coordinate points up; the polar angle θ is the angle with respect to the +z axis. 3 The only relevant issue is that the trajectory of each individual beam particle is known, whether shifted or not, and therefore the amount of matter to be traversed by the secondary hadrons.…”

Section: Performance Of the Harp Large-angle Detectorsmentioning

confidence: 99%

“…6 We observe no appreciable dependence of the deuteron to proton ratio on beam momentum. 7 The beryllium data with +8.9 GeV/c beam momentum [1,2] have been scaled, by interpolation, to a beam momentum of 8.0 GeV/c. Figure 10 shows their published Lorentz-invariant crosssection of π + and π − production by +14.6 GeV/c protons, in the rapidity range 1.2 < y < 1.4, as a function of m T − m π , where m T denotes the pion transverse mass.…”

Section: Comparison Of Charged-pion Productionmentioning

confidence: 99%

“…In the first paper, [1], we described the detector characteristics and our analysis algorithms, on the example of +8.9 GeV/c and −8.0 GeV/c beams impinging on a 5% λ abs Be target. The second paper [2] presented results for all beam momenta from this Be target, and the third paper [3] results from the interactions with a 5% λ abs Ta target.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Cross-sections of large-angle hadron production in proton– and pion–nucleus interactions IV: copper nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c

et al. 2009

Self Cite

View full text Add to dashboard Cite

We report on double-differential inclusive crosssections of the production of secondary protons, charged pions, and deuterons, in the interactions with a 5% λ abs thick stationary copper target, of proton and pion beams with momentum from ±3 GeV/c to ±15 GeV/c. Results are given for secondary particles with production angles 20°< θ < 125°. The inclusive pion production cross-sections are compared to those on beryllium and tantalum, published by us recently.PACS 13.85.Ni · 25.40.Qa

show abstract

Section: The T9 Proton and Pion Beams And The Targetmentioning

confidence: 99%

Section: Performance Of the Harp Large-angle Detectorsmentioning

confidence: 99%

Section: Comparison Of Charged-pion Productionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cross-sections of large-angle hadron production in proton– and pion–nucleus interactions IV: copper nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c

et al. 2009

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the first paper [2] we described the detector characteristics and our analysis algorithms, on the example of +8.9 GeV/c and −8.0 GeV/c beams impinging on a 5% λ int Be target. The second paper [3] presented results for all beam momenta from this Be target. The third [4], fourth [5], fifth [6], sixth [7], and seventh [8] papers presented results from the interactions with 5% λ int tantalum, copper, lead, carbon, and tin targets.…”

Section: Introductionmentioning

confidence: 99%

Cross-sections of large-angle hadron production in proton– and pion–nucleus interactions VIII: aluminium nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c

et al. 2012

Self Cite

View full text Add to dashboard Cite

We report on double-differential inclusive crosssections of the production of secondary protons, charged pions, and deuterons, in the interactions with a 5% λ int thick stationary aluminium target, of proton and pion beams with momentum from ±3 GeV/c to ±15 GeV/c. Results are given for secondary particles with production angles 20 • < θ < 125 • . Cross-sections on aluminium nuclei are compared with cross-sections on beryllium, carbon, copper, tin, tantalum and lead nuclei.

show abstract

First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter

et al. 2012

View full text Add to dashboard Cite

See paper for full list of authors,We present data on dielectron emission in proton induced reactions on a Nb target at 3.5 GeV kinetic beam energy measured with HADES installed at GSI. The data represent the first high statistics measurement of proton-induced dielectron radiation from cold nuclear matter in a kinematic regime, where strong medium effects are expected. Combined with the good mass resolution of 2%, it is the first measurement sensitive to changes of the spectral functions of vector mesons, as predicted by models for hadrons at rest or small relative momenta. Comparing the e+e− invariant mass spectra to elementary p + p data, we observe for e+e− momenta Pee<0.8 GeV/c a strong modification of the shape of the spectrum, which we attribute to an additional ρ-like contribution and a decrease of ω yield. These opposite trends are tentatively interpreted as a strong coupling of the ρ meson to baryonic resonances and an absorption of the ω meson, which are two aspects of in-medium modification of vector mesons. The QCD vacuum is characterized by nonzero expectation values of various quark and gluon operators. Most notable is the finite chiral quark condensate, signaling the spontaneous breaking of chiral symmetry. In a cold strongly interacting medium, the chiral condensate is expected to be modified (in linear density approximation, by about 30% at nuclear saturation density). As predicted by various models [1], [2], [3], [4], [5], [6], [7], [8] and [9], vector meson properties should be affected by changes of the condensates. Such phenomena can be studied in leptonic decays of the vector mesons (e.g. V→e+e−, with V=ρ,ω,ϕ). According to [10] the ρ meson is especially sensitive to changes of those condensates which break chiral symmetry (also called chirally odd condensates). In hadronic many-body approaches many hints have been found for a broadening of the ρ meson spectral function in an ambient nuclear medium [5], [6], [11] and [12]. Experimentally, in-medium properties can be studied in heavy-ion collisions (probing hot and dense hadronic matter) or in proton-, pion- or photon-induced reactions on nuclei (probing cold nuclear matter). For recent reviews on medium effects in cold nuclear matter see in particular [6] and [7]. Medium modifications are expected to be stronger in heavy-ion collisions due to the higher densities and temperatures. Measured observables represent an average over the complete space-time evolution of the temperature and the density of the system. On the other hand, in proton-, pion- or photon-induced reactions the system does not undergo a noticeable density and temperature evolution in time hence conditions of the system are better defined. Electron pair (e+e−) decay of vector mesons is an ideal probe for such studies since electrons and positrons are not affected by strong final state interactions. A promising observable is the spectral shape, i.e. the e+e− invariant mass distribution, but also the nuclear modification of the cross section provides valuable information since i...

show abstract

Cross-sections of large-angle hadron production in proton– and pion–nucleus interactions II: beryllium nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c

Cited by 18 publications

References 307 publications

Cross-sections of large-angle hadron production in proton– and pion–nucleus interactions IV: copper nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c

Cross-sections of large-angle hadron production in proton– and pion–nucleus interactions IV: copper nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c

Cross-sections of large-angle hadron production in proton– and pion–nucleus interactions VIII: aluminium nuclei and beam momenta from ±3 GeV/c to ±15 GeV/c

First measurement of proton-induced low-momentum dielectron radiation off cold nuclear matter

Contact Info

Product

Resources

About