The reaction γp → pπ+π−π+π− for photon energies from 25 to 70 GeV

Aston, D.; Atkinson, M.; Bailey, R.; Ball, A. H.; Bouquet, B.; Brookes, Graham; Bröring, J.; Bussey, P.; Clarke, D.; Clegg, A.B.; Dalmagne, B.; Rosny, G. De; Diekmann, B.; Donnachie, A.; Draper, Michael; Drévillon, B.; Duerdoth, I. P.; Dufey, J.P.; Ellison, R. J.; Ezra, D.; Feller, P.; Ferrer, A.; Flynn, Phil; Friese, F.; Galbraith, W.; George, R.; Gill, S.; Goldberg, M.; Goodman, S.; Graves, W.; Grossetete, B.; Hampson, P.G.; Héinloth, K.; Hughes-Jones, R. E.; Hutton, J. S.; Ibbotson, M.; Jung, M.; Katsanevas, S.; Kemp, M.A.R.; Kovacs, F.; Kumar, B. R.; Lafferty, G.; Lane, J.B.; Lévy, J. M.; Liebenau, V.; Litt, J.; London, G.W.; Mercer, D.; Morris, J. V.; Müller, K.; Newton, D.; Paul, E.; Pétroff, P.; Pons, Y.; Raine, C.; Richard, F.; Richter, R.; Roberts, J.; Roudeau, P.; Rougé, A.; Rumpf, M.; Sené, M.; Six, J.; Skillicorn, I. O.; Sleeman, J. C.; Smith, K. M.; Steinhauer, C.; Storr, K.M.; Thompson, R. J.; Treille, D.; Vaissière, Ch De La; Videau, H.; Videau, I.; Waite, A. P.; Wijangco, A.; Wójcik, W.; Wuthrick, J.P.; Yiou, T. P.

doi:10.1016/0550-3213(81)90079-1

Cited by 47 publications

(11 citation statements)

References 31 publications

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“…Figure 5 shows the measured π + π − π + π − invariant mass spectrum, which exhibits a broad peak around 1540 MeV/c 2 , indicating resonant ρ production similar to what was seen in fixed-target photoproduction experiments [6][7][8][9][10][11]. This assumes that the peak is dominated by spin states with quantum numbers J P C = 1 −− .…”

Section: Resultsmentioning

confidence: 99%

“…Most of them are from photon-proton or photon-deuteron fixed-target experiments at photon energies in the range from 2.8 to 18 GeV [6][7][8][9]. The OMEGA spectrometer measured photoproduction on proton targets at energies E γ of up to 70 GeV [10]. The heaviest target nucleus used so far to study diffractive two-and four-pion photoproduction was carbon with photon energies between 50 and 200 GeV [11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Observation ofπ+π−π+π−photoproduction in ultraperipheral heavy-ion collisions at
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C

126

198

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Observation ofπ+π−π+π−photoproduction in ultraperipheral heavy-ion collisions at
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C

126

198

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“…the "old" ρ ′ (or ρ(1600)) resonance [29]. Taking into account the splitting of the ρ ′ into two ρ-like resonances (ρ(1450) and ρ(1700) [30]) in photoproduction, according to the available data [26,[31][32][33][34][35][36], is not critical at least for our purposes.…”

Section: States Of Thementioning

confidence: 99%

“…Specific methods used for separating a large number of particular channels in the reaction γp → 4πp have been described in detail in Refs. [31][32][33][34][35][36]67]. Table II shows the available data on the reactions γN → π ± π 0 π + π − N for the average incident photon energies from 3.9 to 8.9 GeV.…”

Section: On the Extraction Of Thementioning

confidence: 99%

Exoticρ±ρ0state photoproduction

Achasov

Shestakov

1999

Phys. Rev. D

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It is shown that the list of unusual mesons planned for a careful study in photoproduction can be extended by the exotic states X ± (1600) with I G (J P C ) = 2 + (2 ++ ) which should be looked for in the ρ ± ρ 0 decay channels in the reactions γN → ρ ± ρ 0 N and γN → ρ ± ρ 0 ∆. The full classification of the ρ ± ρ 0 states by their quantum numbers is presented. A simple model for the spin structure of the γp → f 2 (1270)p, γp → a 0 2 (1320)p, and γN → X ± (N, ∆) reaction amplitudes is formulated and the tentative estimates of the corresponding cross sections at the incident photon energy E γ ≈ 6 GeV are obtained:The problem of the X ± signal extraction from the natural background due to the other π ± π 0 π + π − production channels is discussed. In particular the estimates are presented for the γp → h 1 (1170)π + n, γp → ρ ′ + n → π + π 0 π + π − n, and γp → ωρ 0 p reaction cross sections. Our main conclusion is that the search for the exotic X ± (2 + (2 ++ )) states is quite feasible at JEFLAB facility. The expected yield of the γN → X ± N → ρ ± ρ 0 N events in a 30-day run at the 100% detection efficiency approximates 2.8 × 10 6 events. PACS number(s): 13.60. Le, 12.40.Nn, 14.40.Ev

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“…Diffractive production of ρ ′ (1600) was reported in π + π − [7] and 4π [8] final states (for reanalysis of these data in terms of ρ(1450) and ρ(1700) mesons and for references to earlier experiments at lower energies, see [9]). These states were also studied in a recent Fermilab experiment E687 [10] both in 2π and 4π channels.…”

Section: Introductionmentioning

confidence: 99%

Production of spin-3 mesons in diffractive DIS

Иванов¹

2007

Proceedings of Diffraction 06, International Workshop on Diffraction in High-Energy Physics — PoS(DIFF2006)

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We calculate the amplitudes of J P C = 3 −− meson production in diffractive DIS within the k t -factorization approach, with a particular attention paid to the ρ 3 (1690) meson. We find that at all Q 2 the ρ 3 (1690) production cross section is 2-5 times smaller than the ρ(1700) production cross section, which is assumed to be a pure D-wave state. Studying σ L and σ T separately, we observe domination of ρ 3 in σ L and domination of ρ(1700) in σ T and offer an explanation of this behavior in simple terms. We also find very strong contributions -sometimes even domination -of the s-channel helicity violating amplitudes. The typical color dipole sizes probed in ρ 3 production are shown to be larger than those in the ground state ρ production, and the energy dependence of ρ 3 cross section turns out to be much flatter than the ρ production cross section. All the conclusions about the relative behavior of ρ 3 (1690) and ρ(1700) mesons are numerically stable against variations of input parameters.

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The reaction γp → pπ+π−π+π− for photon energies from 25 to 70 GeV

Cited by 47 publications

References 31 publications

Observation ofπ+π−π+π−photoproduction in ultraperipheral heavy-ion collisions at
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C

Observation ofπ+π−π+π−photoproduction in ultraperipheral heavy-ion collisions at
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C

Exoticρ±ρ0state photoproduction

Production of spin-3 mesons in diffractive DIS

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The reaction γp → pπ+π−π+π− for photon energies from 25 to 70 GeV

Cited by 47 publications

References 31 publications

Observation ofπ+π−π+π−photoproduction in ultraperipheral heavy-ion collisions atAbelev1, Aggarwal2, Ahammed3 et al. 2010Phys. Rev. C

Observation ofπ+π−π+π−photoproduction in ultraperipheral heavy-ion collisions atAbelev1, Aggarwal2, Ahammed3 et al. 2010Phys. Rev. C

Exoticρ±ρ0state photoproduction

Production of spin-3 mesons in diffractive DIS

Contact Info

Product

Resources

About

Observation ofπ+π−π+π−photoproduction in ultraperipheral heavy-ion collisions at
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C

Observation ofπ+π−π+π−photoproduction in ultraperipheral heavy-ion collisions at
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C