Powell, Wilson M.
Max results
Sort by Reverse order

Showing 10 of 7011 results

Date

K+- p elastic scattering at 5 gev/c. evidence for a k- p backward peak

Chabaud, V. ; Eide, A. ; Lehmann, P. ; et al.
Phys.Lett.B 38 (1972) 445-448, 1972.
Inspire Record 75816 DOI 10.17182/hepdata.5729

The elastic scattering of K ± mesons on protons has been studied at 5 GeV/c. A total of about 500 000 events have been measured in the c.m. angular range 17° < θ cm < 165° corresponding to 0.2 < − t < (GeV/ c ) 2 . We observed a K − p backward peak which we have parametrized as d σ /d u = (0.6 ± 0.2) exp [(3.3 ± 0.6) u ] μb /(GeV/c) 2 , while for the K + p backward peak we find d σ /d u = (17.5 ± 1) exp [(3.6 ± 0.2) u ] μb /(GeV/c) 2 . The K − p cross-section falls to about 0.03 μ b ( GeV /c) 2 around − t = 5 (GeV/ c ) 2 , while the K + p cross-section stays in the vicinity of 0.3 μ b ( GeV /c) 2 in the same t -region. The K + p and K − p differential cross-sections have cross-over points at − t = 0.2, 1.1 and about 3.5 (GeV/ c ) 2 .

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Elastic scattering of anti-protons on protons at 5 gev/c evidence for a backward peak

Chabaud, V. ; Eide, A. ; Lehmann, P. ; et al.
Phys.Lett.B 38 (1972) 449-451, 1972.
Inspire Record 75820 DOI 10.17182/hepdata.5678

Antiproton-proton elastic scattering has been measured at 5 GeV/c. A total of 30 000 events were observed in the angular range 17° < θ cm < 136°, corresponding to 0.3 < − t < 7.7 (GeV/ c 2 ). In addition to the known dip at − t = 0.5 ( GeV / c ) 2 , we observe a structure at about − t = 2 (GeV/ c ) 2 and a backward peak with a slope4.1 ± 0.6 (GeV/ c ) 2 . The extrapolated differential cross-section at u = 0 is 1.3 ± 0.8 μ b/(GeV/ c ) 2 .

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Measurement of large angle pi+- p elastic scattering at 5 gev/c

Chabaud, V. ; Eide, A. ; Lehmann, P. ; et al.
Phys.Lett.B 38 (1972) 441-444, 1972.
Inspire Record 75821 DOI 10.17182/hepdata.6523

The differential cross-section for 5 GeV/ cπ + p and π − p elastic scattering have been measured in the c.m. angular region 27° < θ cm < 130° corresponding to 0.5 < | t | < 7.8 (GeV/ c ) 2 . Dips are observed in both reactions at − t = 2.8 and 4.8 (GeV/ c ) 2 where the cross-sections are approximately 0.1 μ b/(GeV/ c ) 2 .

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Six-prong interactions of pi+ mesons with protons at 8 gev/c

Bardadin-Otwinowska, M. ; Hofmokl, T. ; Wojcik, W. ; et al.
Phys.Rev.D 4 (1971) 2711-2739, 1971.
Inspire Record 74762 DOI 10.17182/hepdata.3770

Final results for 3678 six-prong π+p events at 8 GeV/c are presented. Single-particle distributions are compared with the predictions of the Chan-Loskiewicz-Allison model and the phenomenological model of the F(t) function. Differences between the transverse momenta of the π+ and π− and between the transverse momenta of secondaries emitted forward and backward in the c.m. system are observed. Cross sections for production of the ρ0, ρ+, ρ−, η, ω0, X0, and D0 mesons and the N33*++ and N33*− isobars are given, together with upper limits for some other resonances. The D0 meson is observed in the seven-body channel in the ηπ+π− system, with some evidence for the cascade decay D0→δ±π∓→ηπ+π−. The branching ratio (f0→2π+2π−)(f0→2π) is determined to be (2.2−2.2+4.5)%. Upper limits for the decay of A mesons into X0π systems are quoted. The cross section for the two-body reaction π+p→N33*++X0 is determined to be 30 ± 13 μb, from which the η0−X0 mixing angle is derived. Associated production of N33*++ and ρ0 in the six-body channel and of N33*++, ρ0, and ω0 in the seven-body channel is studied, and the cross sections for reactions involving simultaneous production of these resonances are estimated. The Goldhaber-Goldhaber-Lee-Pais effect is studied and shown to be strong in the six-body channel, especially for selected events with low energy of the pion system.

73 data tables
Table 1

TOTAL NUMBER EVENTS=504. DATA FROM T 1.

Table 2

TOTAL NUMBER EVENTS=1075. DATA FROM T 1.

Table 3

TOTAL NUMBER EVENTS=425. DATA FROM T 1.

More…

Anti-p p backward scattering and s-channel resonances - upper limit to the anti-p p coupling of the s(1929) meson

Bizzarri, R. ; Guidoni, P. ; Marzano, F. ; et al.
Phys.Rev.D 6 (1972) 160-163, 1972.
Inspire Record 74038 DOI 10.17182/hepdata.22256

From the energy dependence of the p¯p and p¯n inelastic cross sections we deduce an upper limit to the resonant contribution in p¯p backward scattering for c.m. energies between 1915 and 1950 MeV. This limit is smaller than the expected contribution from diffraction scattering. The energy dependence of the 180° p¯p elastic cross section in this energy range cannot therefore be directly related to the formation of s-channel resonances.

1 data table
Table 1

CROSS SECTION ONLY FOR ANNIHILATION EVENTS WITH EMISSION OF SPECTATOR PROTON TOO SLOW TO GIVE A VISIBLE TRACK (LESS THAN ABOUT 80 MEV/C) - ABOUT 60 PCT OF TOTAL ANNILILATION. NUMERICAL VALUES TAKEN FROM TABLE 2 OF R. BIZZARRI ET AL., NC 22A, 225 (1974).


Search for narrow resonances in the r region

Bowen, D. ; Earles, D. ; Faissler, W. ; et al.
Phys.Rev.Lett. 29 (1972) 890-893, 1972.
Inspire Record 75434 DOI 10.17182/hepdata.21418

We report on a measurement of the missing-mass, (mm)−, spectrum from the reaction π−+p→(mm)−+p at 8 GeV. The data contain 6500 events in the R peak (M2=2.72±0.02 GeV2, Γ=139±31 MeV). The R shape is consistent with either a single Breit-Wigner or several wide resonances, as suggested by bubble-chamber experiments, but inconsistent with the series of narrow resonances reported by the CERN missing-mass group.

1 data table
Table 1

No description provided.


Strange-particle production in pi- p collisions at 11.2 gev/c leading to two charged final particles

Dameri, M. ; Tomasini, G. ; Trevisan, U. ; et al.
Nuovo Cim.A 9 (1972) 1-27, 1972.
Inspire Record 78421 DOI 10.17182/hepdata.37457

In this paper we present the results of an analysis of strange-particle production in π−p collisions leading to two charged final particles and at least one strange neutral decay. The sample consists

1 data table
Table 1

No description provided.


Depolarization in Elastic pn Scattering at 612 MeV

Glonti, L.N. ; Kazarinov, Yu. M. ; Khayatov, M.R. ;
Sov.Phys.JETP 35 (1972) 1042-1046, 1972.
Inspire Record 78798 DOI 10.17182/hepdata.39963

None

1 data table
Table 1

No description provided.


Low-momentum antiproton production at the CERN Proton Synchrotron

Kalmus, P.I.P. ; Eisenhandler, E. ; Gibson, W.R ; et al.
CERN-71-25, 1971.
Inspire Record 69690 DOI 10.17182/hepdata.50029

None

2 data tables
Table 1

proton-beryllium TOTAL cross section ( 278 mb ) was used for normalization.

Table 2

Proton-beryllium TOTAL (???) cross section ( 278 mb ) was used for normalization.


Neutron-proton charge-exchange scattering, 3-12 gev/c

Miller, E.L. ; Elfield, M. ; Reay, N.W. ; et al.
Phys.Rev.Lett. 26 (1971) 984-987, 1971.
Inspire Record 69018 DOI 10.17182/hepdata.37275

We report a high-statistics measurement of the neutron-proton charge-exchange differential cross section for incident momenta 3 to 12 GeVc, and four-momentum transfers 0.003 to 0.85 (GeVc)2. The data are normalized absolutely to ±20%. The differential cross section is characterized by a sharp peak at small momentum transfers, with a gentler exponential behavior at large momentum transfers. This shape is remarkably independent of the incident momentum.

2 data tables
Table 1

No description provided.

Table 2

No description provided.