We have studied the quasielastic reaction νμn→μ−p in an exposure of the Fermilab deuterium-filled 15-foot bubble chamber to a high-energy wide-band neutrino beam. From an analysis of the Q2 distribution based on the standard V−A theory, the axial-vector mass in a dipole parametrization of the axial-vector form factor is determined to be MA=1.05−0.16+0.12 GeV, consistent with the values previously reported from low-energy experiments.
Measured Quasi-Elastic total cross section.
Measurements of the K - p and K + p elastic differential cross sections at 20 and 50 GeV/ c , respectively, have been made in the momentum transfer range 0.7 < ∥ t ∥ < 8.0 GeV/ c .
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A description is given of an experiment to study elastic scattering of π ± , K ± and p on protons at c.m. scattering angles from 45° to 100° at incident laboratory momenta 20 GeV/ c and 30 GeV/ c . The corresponding t range is from −6.2 (GeV/ c ) 2 to −28 (GeV/ c ) 2 . There are no previous observations for these reactions in this t range. High intensity and large geometrical acceptance were required in order to measure the low cross sections. The experiment used a double-arm spectrometer. MWPCs were used for reconstruction, and threshold and differential Čerenkov counters for identification. Scintillation counters, Čerenkov counters and a hadron calorimeter were used in the trigger. The trigger logic utilized specially designed matrices and a hard wired microprocessor. The π − p elastic scattering cross sections follow approximately the dimensional counting rule from 3.5 GeV/ c .and up to 30 GeV/ c . The cross sections decrease by seven orders of magnitude in this energy range. The data is compared to quark models. None of these models give a comprehensive description of the results. However, some modifications to these models improve their consistency with the data.
EARLIER RESULTS GIVEN IN 'A'.
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Measurements of the differential elastic cross sections for π − p scattering at incident momenta of 20 and 50 GeV c and π + p at 50 GeV c in the momentum transfer range 0.7 < |t|; < 8.0 ( GeV c ) 2 are presented. The data are compared with various models of elastic scattering.
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Data on inclusive and semi-inclusive production of nonstrange meson resonances from a bubble chamber study of pn interactions at 19 GeV/c are presented. Most of the results concern ρ0 production. The inclusive cross-sectionσ(pn → ρ0+x)=(2.4±0.4) mb agrees well with pp data. The ρ0 cross-sections are equal in the protonlike and neutron-like hemispheres. The differential cross-sections are in general agreement with earlier observation in pp interactions. In the fragmentation region the approximate structure function can be described byEdσ/dx= =a(1−|x|)n withn=3.0±0.8 in agreement with recent predictions from quark counting rules. The production of ω(780) is observed in the reaction pn→pp+ω+X with a cross-section σ=(0.13±0.03) mb. There is indication of f0(1270) and g(1680) production.
Axis error includes +- 0.0/0.0 contribution (?////FITTING ERRORRES-DEF(RES=RHO0,BACK=CORRECTED,DEF=0.5 < M(PI+ PI-) < 1.05 GEV,C=MASS AND WIDTH FROM PDG 1980)//RES-DEF(RES=F,BACK=CORRECTED,DEF=0.9 < M(PI+ PI-) < 1.5 GEV,C=MASS AND WIDTH FROM PDG 1980)//RES-DEF(RES=G(1700)0,BACK=CORRECTED,DEF=1.36 < M(PI+ PI-) < 2.1 GEV,C=MASS AND WIDTH FROM PDG 1980)NO REFLECTIONS ,E.G. FROM DEL++, DEL-, OMEGA HAVE BEEN CONSIDERED).
Axis error includes +- 0.0/0.0 contribution (?////FITTING ERRORRES-DEF(RES=RHO0,BACK=CORRECTED,DEF=0.5 < M(PI+ PI-) < 1.05 GEV,C=MASS AND WIDTH FROM PDG 1980)//RES-DEF(RES=F,BACK=CORRECTED,DEF=0.9 < M(PI+ PI-) < 1.5 GEV,C=MASS AND WIDTH FROM PDG 1980)//RES-DEF(RES=G(1700)0,BACK=CORRECTED,DEF=1.36 < M(PI+ PI-) < 2.1 GEV,C=MASS AND WIDTH FROM PDG 1980)NO REFLECTIONS ,E.G. FROM DEL++, DEL-, OMEGA HAVE BEEN CONSIDERED).
Axis error includes +- 0.0/0.0 contribution (?////FITTING ERRORRES-DEF(RES=RHO0,BACK=CORRECTED,DEF=0.5 < M(PI+ PI-) < 1.05 GEV,C=MASS AND WIDTH FROM PDG 1980)//RES-DEF(RES=F,BACK=CORRECTED,DEF=0.9 < M(PI+ PI-) < 1.5 GEV,C=MASS AND WIDTH FROM PDG 1980)//RES-DEF(RES=G(1700)0,BACK=CORRECTED,DEF=1.36 < M(PI+ PI-) < 2.1 GEV,C=MASS AND WIDTH FROM PDG 1980)NO REFLECTIONS ,E.G. FROM DEL++, DEL-, OMEGA HAVE BEEN CONSIDERED).
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Measurements are presented of the inclusive charged-particle cross sections s dσdx for e+e− annihilation at center-of-mass energies of 5.2, 6.5, and 29.0 GeV. Significant scale breaking is observed in these cross sections.
CROSS SECTION S*D(SIG)/DX FOR CHARGED PARTICLES AT SQRT(S) = 5.2, 6.5 AND 29.0 GEV. NUMERICAL VALUES OF DATA TAKEN FROM THESIS OF J.F. PATRICK LBL-14585.
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The Mark II detector at SPEAR has been used to study D-meson production in e+e− annihilation at center-of-mass energies between 3.8 and 6.7 GeV. The neutral and charged D mesons are identified from their K∓π± and K∓π±π± decay modes. Measurements of RD and of the inclusive differential cross section s dσdz are presented. The quasi-two-body cross sections σDD¯, σD*D¯, and σD*D¯* are derived from an overall fit to the D recoil spectra. No evidence was found for the associated production of charmed mesons and charmed baryons.
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THE DIFFERENTIAL SCALING CROSS SECTION FOR NEUTRAL AND CHARGED D'S. DEFINITION OF Z IS 2*E(P=3)/SQRT(S).
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