Structure in the Pion-Proton Total Cross Section Between 2.5 and 5.5 BeV/<i>c</i>

Citron, A.; Galbraith, W.; Kycia, T. F.; Leontić, Boran; Rousset, A.

doi:10.1103/physrevlett.13.205

Cited by 43 publications

(6 citation statements)

References 5 publications

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“…The relative A -dependence behavior of the production cross section then yields information on the p°-nucleon mean free path in nuclear matter. With the diffraction model of Drell and Trefil, 8 the best fit of our data yields r 0 = 1.29 ±0.04 F, and o pN = 31.3 ±2.3 mb, 4 in good agreement with the total 7r-nucle~ on cross section («30 mb) in the same energy region, as predicted by SU(6). 5 (b) t dependence.--The behavior of do/d\t\ as a function of four-momentum transfer t = (p-k) 2 was obtained at a fixed # 0 = 15°, a constant central p° laboratory momentum of 2.7 GeV/c, and fixed mass interval 700 MeV/c 2 <M<800 MeV/c 2 .…”

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confidence: 73%

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High Energy Photoproduction of Neutral Rho Mesons on Complex Nuclei

et al. 1967

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In an experiment performed at the Deutsches Elektronen-Synchrotron (DESY) 6.2-GeV electron synchrotron we have studied the production, at forward angles, of TT+TT" pairs from the reaction y+A~ A + TT +77(1)Measurements were made for various target nuclei A (Be, C, Al, Cu, Ag, and Pb), momenta of the 3.04, 3.5, and 4.5 GeV/c), and peak incident bremsstrahlung energies & max (4.35 and 6.02 GeV). The objects of the experiment were fourfold: first, to search for possible 0 + , 1~~, 2 + , • • • resonances by measuring the pair invariantmass distribution in the region 0.35-1.2 GeV/ c 2 ; second, to study the mechanism by which p° mesons are produced at high energy and low momentum transfers, where diffraction seems to dominate 1 ; third, to determine the p°-N cross section using the diffraction model; and fourth, to determine the mass and width of photoproduced p° mesons.The TT+TT-pairs were detected by a doublearm magnetic spectrometer which has been described in a previous publication. 2 Through scintillation-counter hodoscopes, the kinematics of each event was then defined within the following uncertainty: 6p/p = ±2%, 66/6 = ±3%, and 6m/m =±2%. The separation of TT + TT~" pairs from the background of e + e~ pairs was accomplished by four large-aperture threshold Cherenkov counters and two lead-Lucite shower counters; protons were rejected by time-offlight techniques.In the kinematical region accepted by our spectrometer (0 o = 4°-17.2°, p 0 = 1.2-2.25 GeV/ c, ^m ax = 4 -35 or 6.02 GeV), our measurements show that, for TT+TT-pair masses from 0.350 to 1.20 GeV/c 2 , Reaction (1) is dominated by p°-meson production. Within the statistical accuracy, 5%, no other TT + TT"~ enhancements were observed. Therefore, as described below, we have used Reaction (1) to study the differential p° production cross section and to gain information as to the production mechanism of p° mesons.To study the mechanism by which p° mesons are produced at high energy and low momentum transfer, we compare the data with the predictions of the diffraction models of Berman and Drell, Drell and Trefil, and Ross and Stodolsky, 3 in which the forward p° production cross section may be expressed (in the laboratory system) as da/cm = C(A)p*f>(p)f T (R,t,G pN ),(where p is the momentum of the p° meson, R = r 0 A us is the nuclear radius, Op^ is the total p°-nucleon absorption cross section, and t is the square of the momentum transfer to the nucleus. C(A) is a normalization constant. The function/'(p) is proportional (following Berman and Drell) to p(p 2 + m 2 )~x /2 a 7l N 2 (p), where ^^jsjiP) is the total 7r-nucleon cross section.The function/j, describing the production and reabsorption of p° mesons by the target nucleus, is found as follows: The forward production amplitude/(0°) on each individual target nucleon is attenuated by a factor exp(-20pN® x ) where x = distance traveled by p° inside the nucleus after its production, and D = nucleon density function, a constant inside a sphere of radius R, zero elsewhere. Then, integrating over the nuc...

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confidence: 73%

“…8 The comparison of do/dQ with the forward ir-N diffraction cross section (do/ dty^-p is shown in Fig. 2(d), where one approximates the energy variation of the total TT~-p cross section by an empirical formula The quantity [f'(p)p 2 f T ]" 1 da/d£l is relatively independent of incident momentum/).…”

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confidence: 99%

High Energy Photoproduction of Neutral Rho Mesons on Complex Nuclei

et al. 1967

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“…We are now in a position to investigate this speculation about 0 in a simultaneous fit to Eqs. (3) through (7).…”

Section: + D{by {V B})+(3(v ){By B» (9)mentioning

confidence: 99%

Analysis of Total Cross-Section Differences at High Energy

Barger

Olsson

1965

Phys. Rev. Lett.

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“…The data used in this paper are taken from Lindenbaum et al (1961), Diddens et al (1963), Citron et al (1964), Galbraith et al (1965), Foley et al (1967), and Allaby et al (1969). Figure 1 shows (5)) plotted against (a) P1ab and (b) E 1ab/mc 2 :…”

Section: Range Of the Quark-quark Interaotionmentioning

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Estimation of the Properties of Quarks. I. Vector Quark?Quark Interaction

Smith¹,

Tassie²

1970

Aust. J. Phys.

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AbatractFrom the sum rules for hadron scattering, the nucleon form factors, and the masses of the hadrons, the properties of quarks are estimated as: 2 Ge V Jc2 ;:; quark mass ;:; 30 Ge V Jc2, 0·1 fm ;:; range of the quark-quark interaction ;:; 0·25 fm.The hadrons are described by a relativistic independent quark model using the Dirac equation with a potential energy term for the effective interaction. This model is compared with a rigid rotor model.

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Structure in the Pion-Proton Total Cross Section Between 2.5 and 5.5 BeV/c

Cited by 43 publications

References 5 publications

High Energy Photoproduction of Neutral Rho Mesons on Complex Nuclei

High Energy Photoproduction of Neutral Rho Mesons on Complex Nuclei

Analysis of Total Cross-Section Differences at High Energy

Estimation of the Properties of Quarks. I. Vector Quark?Quark Interaction

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