Booth, E.C.
Pion-Proton Scattering
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Inelastic Diffractive Scattering at FNAL Energies

Ayres, D.S. ; Diebold, Robert E. ; Cutts, D. ; et al.
Phys.Rev.Lett. 37 (1976) 1724, 1976.
Inspire Record 109174 DOI 10.17182/hepdata.21057

Inelastic differential cross sections have been measured for π±p, K±p, and p±p at 140- and 175-GeV/c incident momentum over a |t| range from 0.05 to 0.6 GeV2 and covering a missing-mass region from 2.4 to 9 GeV2. For Mx2 greater than 4 GeV2, the invariant quantity Mx2d2σdtdMx2 was found to be independent of Mx2 at fixed t and could be adequately described by a simple triple-Pomeron form. The values obtained for the triple-Pomeron couplings are identical within statistics for all channels.

1 data table
Table 1

Data from 140 GeV and 175 GeV are combined. The distributions are fit to CONST*(SLOPE(C=1)*T+SLOPE(C=2)*T**2).


Radiative decay of the Delta resonance: Analyzing powers for pi- p (polarized) ---> gamma n

Stasko, J.C. ; Bassalleck, B. ; Booth, E.C. ; et al.
Phys.Rev.Lett. 72 (1994) 973-976, 1994.
Inspire Record 376202 DOI 10.17182/hepdata.19677

The polarized target asymmetry AN for π−p→→γn has been measured by coincident detection of the γ and the neutron at several angles across the Δ resonace energy region. A high-resolution NaI γ spectrometer together with good time-of-flight information for the neutron resulted in excellent separation of this radiative capture reaction from the much higher cross-section charge exchange reaction π−p→→π0n. Statistical uncertainties are ΔAN=0.02-0.04, representing a significant improvement over previous results. The new data are discussed in the context of recent theoretical models.

1 data table
Table 1

No description provided.


High Transverse Momentum $\eta$ Production in $\pi^- p$, $\pi^+ p$ and $p p$ Interactions at 280-{GeV}/$c$

The WA70 collaboration Bonesini, M. ; Bonvin, E. ; Booth, P.S. L. ; et al.
Z.Phys.C 42 (1989) 527, 1989.
Inspire Record 267856 DOI 10.17182/hepdata.15526

The inclusive cross sections for η production by the interactions of 280 GeV/c momentum π−, π+, and proton beams in hydrogen have been measured. The kinematical range covered is −0.45<xF<0.45, and 4.0<PT<7.0 GeV/c for FeynmanxF and transverse momentum respectively. The η to π0 cross section ratios are given for the three reactions. The ratio of π−p to π+p cross sections for η production in the above kinematic ranges is 1.22±0.08±0.11.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


High Transverse Momentum $\pi^0$ Production by $\pi^-$ and $\pi^+$ on Protons at 280-{GeV}/$c$

The WA70 collaboration Bonesini, M. ; Bonvin, E. ; Booth, P.S. L. ; et al.
Z.Phys.C 37 (1987) 39-50, 1987.
Inspire Record 250754 DOI 10.17182/hepdata.15679

The inclusive cross sections for π0 production by π− and π+ on protons have been measured with a beam momentum of 280 GeV/c using a fine grained electromagnetic calorimeter and the CERN Omega spectrometer. The transverse momentum and FeynmanxF ranges covered are 4.0<pT<7.0 GeV/c and −0.45<xF<0.6 respectively. The data are compared with leading order QCD calculations.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


A Partial Wave Analysis of the ($K^+ K^- \pi^-$) System Produced in $\pi^- p \to K^+ K^- \pi^- p$ at 16-{GeV}/$c$

The Aachen-Bari-Bonn-CERN-Glasgow-Liverpool-Milan collaboration Armstrong, T.A. ; Baccari, B. ; Bonesini, M. ; et al.
Nucl.Phys.B 202 (1982) 1-20, 1982.
Inspire Record 169445 DOI 10.17182/hepdata.44589

The reaction π − p → K + K − π − p at 16 GeV/ c was studied in the CERN OMEGA spectrometer and a partial-wave analysis (PWA) of the low-mass (K + K − π − ) system (1.3–2.0 GeV) was performed. Only states in the unnatural spin-parity series produced by natural parity exchange are important and they approximately conserve t -channel helicity. The 1 + S K ∗ K wave dominates the low-mass (K + K − π − ) region. We observe an enhancement in 2 − P K ∗ K wave at a mass of 1.7 GeV, consistent with the decay of the A 3 resonance.

3 data tables
Table 1

TOTAL ACCEPTANCE CORRECTED CROSS SECTION.

Table 2

ACCEPTANCE CORRECTED.

Table 3

MOST IMPORTANT CONTRIBUTING STATES CORRECTED FOR ACCEPTANCE.


A Study of the Reaction $\pi^- p \to \phi \phi n$ at 16-{GeV}/$c$

The Aachen-Bari-Bonn-CERN-Glasgow-Liverpool-Milan collaboration Armstrong, T.A. ; Baccari, B. ; Booth, P.S.L. ; et al.
Nucl.Phys.B 196 (1982) 176-188, 1982.
Inspire Record 165251 DOI 10.17182/hepdata.34217

The reaction π − p → φφ n has been isolated at 16 GeV/ c and its cross section determined to be 40 ± 10 nb. The φφ mass spectrum shows a threshold enhancement between 2.1 and 2.5 GeV. A successful description of the angular content of the φφ system requires two interferingss J P = 2 + states.

2 data tables
Table 1

No description provided.

Table 2

SLOPE OF DIFFERENTIAL TP(P=3,P=2) DISTRIBUTION.


Search for structure in pi- p ---> lambda k0 at sigma k threshold

Nelson, B. ; Knasel, T.M. ; Lindquist, J. ; et al.
Phys.Rev.Lett. 31 (1973) 901-904, 1973.
Inspire Record 83771 DOI 10.17182/hepdata.21338

We have measured the cross section, the angular distribution, and the Λ polarization for the reaction π−p→ΛK0. A spark-chamber spectrometer was used to collect 8400 ΛK0 events at fourteen beam momenta near ΣK threshold. Our data do not show the prominent cross-section enhancement suggested by some previous experiments. However, detailed structure in the cross section and the angular distribution agrees well with a simple model which includes a cusp effect at ΣK threshold.

3 data tables
Table 1

No description provided.

Table 2

BACKWARD-FORWARD PRODUCTION ASYMMETRY.

Table 3

AVERAGE LAMBDA POLARIZATION.


Experimental study of the reaction $\pi^- p \to \Lambda K^0$ at beam momenta between 930 and 1130 MeV/c

Knasel, T.M. ; Lindquist, J. ; Nelson, B. ; et al.
Phys.Rev.D 11 (1975) 1-13, 1975.
Inspire Record 107188 DOI 10.17182/hepdata.24916

We have used an optical spark-chamber spectrometer to perform a systematic study of the reaction π−p→ΛK0 at beam momenta between 930 and 1130 MeV/c. The cross section, angular distribution, and Λ polarization have been measured. We present our complete data from a sample of 11 400 events along with Legendre polynomial coefficients for the angular distributions. No striking cross-section enhancement at ΣK threshold is observed, but there is evidence for a small cusp effect. A simple model which takes account of the ΣK channel provides a good fit to our data.

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

More…

Measurement of the polarization parameter in pi- p backward elastic scattering at 6-GeV/c

The CERN-Orsay-Oxford collaboration Dick, L. ; Janout, Z. ; Aoi, H. ; et al.
Nucl.Phys.B 64 (1973) 45-57, 1973.
Inspire Record 94951 DOI 10.17182/hepdata.32420

The polarization parameter in π − p elastic scattering has been measured in the backward angular region at an incident momentum of 6 GeV/ c . The measurements cover the range of four momentum transfer u = 0 to −1 (GeV/ c ) 2 , and were obtained with a high intensity pion beam, a butanol polarized proton target, and arrays of scintillation counter hodoscopes. The polarization is different from zero, in contradiction to the prediction of the naive one trajectory Regge-exchange model. It increases positively with the four-momentum transfer u, reaching a maximum of about 0.4 at u ≈ −0.3 (GeV/c)2. It then decreases and becomes slightly negative beyond u ≈ −0.5 (GeV/c)2. A variety of baryon exchange models are briefly reviewed and none are found to be in complete agreement with all the experimental data.

1 data table
Table 1

No description provided.


Measurement of the polarization parameter in pi+ p backward elastic scattering at 6-GeV/c

The CERN-IPN Orsay-Oxford collaboration Dick, L. ; Janout, Z. ; Aeoi, H. ; et al.
Nucl.Phys.B 43 (1972) 522-540, 1972.
Inspire Record 75086 DOI 10.17182/hepdata.32869

The polarization parameter in π + p backward elastic scattering at 6 GeV/ c incident pion momentum has been measured using a butanol polarized proton target, a high intensity pion beam, and a scintillation hodoscope detection system. Details of the apparatus and data analysis are presented here, together with the final results.

1 data table
Table 1

No description provided.