Tether, S.
Max results
Sort by Reverse order

Showing 10 of 5500 results

Date

Measurement of the Ratios of $\bar{\nu}_\mu n$ to $\bar{\nu}_\mu p$ Charged Current Cross-sections at High-energies

Allasia, D. ; Angelini, C. ; Baldo-Ceolin, M. ; et al.
Phys.Lett.B 107 (1981) 148-152, 1981.
Inspire Record 167732 DOI 10.17182/hepdata.39982

From the analysis of 5630 v υ and of 1372 v π charged current interactions, obtained in the BEBC bubble chamber filled with deuterium and exposed to the CERN wide band antineutrino beam, the ratios of cross section on neutron and photon targets have been measured and found to be R  σ ν)/σ v p = 0.51 ± 0.01 (±0.03) , and R  σ( ν n )/σ( v p ) = 22.2 ± 0.12 (±0.25) The dependence of these ratios on the x scaling variable shows, in a direct way, that the momentum distribution of the majority quark, u p ( x ) = d n ( x ), is broader than that of the minority quark, u n ( x ) = d p ( x ).

2 data tables
Table 1

No description provided.

Table 2

No description provided.


rivet Analysis
Dimuon Scaling Comparison at 44-{GeV} and 62-{GeV}

Antreasyan, D. ; Becker, U. ; Bellettini, G. ; et al.
Phys.Rev.Lett. 48 (1982) 302, 1982.
Inspire Record 168182 DOI 10.17182/hepdata.20610

Measurements of pp→μ+μ−+X at s=44 and 62 GeV are compared. The data are taken under identical conditions utilizing clean proton-proton collisions from the CERN intersecting storage rings and confirm scaling to 5%. The observed μ+μ− yield is a factor of 1.6±0.2 larger than estimated from a simple parton model but is consistent with QCD. The pT dependence of the muon pairs agrees well with expectations from QCD.

1 data table
Table 1

No description provided.


Inclusive $\pi^0$ Production in 250-{GeV}/$c \pi^- p$ Interactions

Diamond, R.N. ; Hagopian, S. ; Hays, P.J. ; et al.
Phys.Rev.D 25 (1982) 41, 1982.
Inspire Record 11137 DOI 10.17182/hepdata.23973

Neutral-pion production in 250-GeV/c π−p interactions are studied using the Fermilab 15-ft bubble chamber. The mean number of neutral pions produced is 3.54±0.15 per inelastic collision and a fit to a linear dependence on the charged multiplicity gives 〈n0〉=1.30+0.56n−. The π0 transverse- and longitudinal-momentum distributions are obtained from the inclusive γ-ray data and compared with the distribution obtained from those π0's which have both decay γ rays converting in the bubble chamber.

1 data table
Table 1

PI0 MEAN MULTIPLICITY IS OBTAINED FROM SIG(PI0,BACKGROUND CORRECTED)=70.8+-8.3 MB. THE NON-CORRECTED BACKGROUD SIG(PI0)=75.7+-3.2 MB AND < PI0 >=3.54+-0.15.


CHARM PARTICLE PRODUCTION IN 360-GeV pi- p AND 360-GeV p p INTERACTIONS

The Amsterdam-Brussels-CERN-Madrid-Mons-Nijmegen-Oxford-Padua- Paris-Rutherford-Serpukhov-Stockholm-Strasbourg-Turin-Trieste collaboration Aguilar-Benitez, M. ; Allison, W. ; Bagnaia, P. ; et al.
IFVE-81-165, 1981.
Inspire Record 169453 DOI 10.17182/hepdata.34204

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


rivet Analysis
Production of $\pi^0 \pi^0$ and $\pi^0 \eta$ in Photon - Photon Collisions

Edwards, C. ; Partridge, Richard ; Peck, C. ; et al.
Phys.Lett.B 110 (1982) 82-86, 1982.
Inspire Record 168793 DOI 10.17182/hepdata.30959

We investigate the four-photon final state produced in γγ colissions. In the π 0 π 0 channel we observe f(1270) production with predominantly helicity 2 and measure a partial width Γ γγ 2.9 +0.6 −0.4 ± keV (independent of assumptions on the helicity). We observe A 2 (1310) production in the π 0 η channel and find a partial width Γ γγ = 0.77 ± 0.18 ± 0.27 KeV (assuming helicity 2). We give an upper limit for f ≈ ηη .

3 data tables
Table 1

Data read from graph. Systematic error on M is of order of 2% or less.

Table 2

Data read from graph.

Table 3

No description provided.


rivet Analysis
$\pi^0$ Production by $e^+ e^-$ Annihilation at 14-{GeV} and 34-{GeV} Center-of-mass Energy

The TASSO collaboration Brandelik, R. ; Braunschweig, W. ; Gather, K. ; et al.
Phys.Lett.B 108 (1982) 71-76, 1982.
Inspire Record 168232 DOI 10.17182/hepdata.31018

The process e + e − → π 0 + anything has been measured at c.m. energies of 14 and 34 GeV for π 0 energies between 0.5 and 4 GeV. The ratio of π 0 to π ± production for π momenta between 0.5 and 1.5 GeV/ c is measured to be 2 σ ( π 0 )/ [ σ ( π + ) + σ ( π − )] = 1.3 ± 0.4 (1.2 ± 0.4) at 14 (34) GeV. The scaled cross section ( s / μ )d σ /d x when compared with lower energy (4.9–7.4 GeV) π 0 data indicates a substantial scaling violation.

3 data tables
Table 1

COMPARISON OF PI0 WITH CHARGED PION CROSS SECTIONS (SCALED BI 1/S TO SAME ENERGIES).

Table 2

No description provided.

Table 3

No description provided.


A Comparison of $\bar{p} p$ and $p p$ Interactions in the Central Region at $\sqrt{s}=53$-{GeV}

The Axial Field Spectrometer collaboration Akesson, T. ; Albrow, M.G. ; Almehed, S. ; et al.
Phys.Lett.B 108 (1982) 58-62, 1982.
Inspire Record 168036 DOI 10.17182/hepdata.31012

The inclusive production cross sections of pions, kaons, protons, and antiprotons in p p and pp interactions at √ s =53 GeV are compared in the kinematic range | y | < 0.8 and p T < 1.5 GeV/ c . We observe differences in the K + /K − and p /p ratios for the two data samples. Although the bulk of the particles are produced with the same momentum and rapidity distributions in p p and pp collisions, we observe difference in these distributions for produced protons and antiprotons.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Observation of a Charge Asymmetry in $e^+ e^- \to \mu^+ \mu^-$

The JADE collaboration Bartel, W. ; Cords, D. ; Dittmann, P. ; et al.
Phys.Lett.B 108 (1982) 140-144, 1982.
Inspire Record 168234 DOI 10.17182/hepdata.31023

The angular distribution and the s dependence of the total cross section for the process e + e − → μ + μ − have been measured using the JADE detector at PETRA. After radiative corrections, a forward-backward asymmetry of −(11.8±3.8) % was observed at an average centre of mass energy of 33.5 GeV. For comparison, an asymmetry of −7.8 % is expected on the basis of the standard Glashow-Salam-Weinberg model.

5 data tables
Table 1

Best fit to total cross section in energy range.

Table 2

ANGULAR DISTRIBUTION.

Table 3

Forward-backward asymmetry within the acceptnce region.

More…

rivet Analysis
Hadron Production by e+ e- Annihilation at Center-Of-Mass Energies Between 2.6 GeV and 7.8 GeV: Part 1. Total Cross-Section, Multiplicities and Inclusive Momentum Distributions

Siegrist, J. ; Schwitters, R. ; Alam, M.S. ; et al.
Phys.Rev.D 26 (1982) 969, 1982.
Inspire Record 169326 DOI 10.17182/hepdata.23889

Measurements of multihadron production in e+e− annihilation at center-of-mass energies between 2.6 and 7.8 GeV are presented. Aside from the narrow resonances ψ(3095) and ψ(3684), the total hadronic cross section is found to be approximately 2.7 times the cross section for the production of muon pairs at c.m. energies below 3.7 GeV and 4.3 times the muon-pair cross section at c.m. energies above 5.5 GeV. Complicated structure is found at intermediate energies. Charged-particle multiplicities and inclusive momentum distributions are presented.

7 data tables
Table 1

ERRORS ARE STATISTICAL ONLY.

Table 2

ERRORS INCLUDE SYSTEMATICS.

Table 3

R WITH SMALLER BINNING AROUND RESONANCE REGION. ERRORS ARE STATISTICAL ONLY.

More…

Measurements of $\pi^- p$ Forward Elastic Scattering at High-energies

Burq, J.P. ; Chemarin, M. ; Chevallier, M. ; et al.
Phys.Lett.B 109 (1982) 111, 1982.
Inspire Record 166767 DOI 10.17182/hepdata.31011

The differential cross section of π − p scattering has been measured in the energy region 100–345 GeV and in the t -range 0.002<| t |< 0.04 (GeV/ c ) 2 . The real part of the π − p scattering amplitude has been extracted from the data. The results show that the real part continues to increase with energy. The energy dependence of the slope parameter has also been determined. The shrinkage found expressed in terms of the slope of the pomeron trajectory is2 α ′ p =0.23±0.04 (GeV/ c ) −2 . This agrees with the energy dependence found at larger| t |-values.

1 data table
Table 1

RE(AMP)/IM(AMP) (REAL/IMAG) AND SLOPE PARAMETERS DEDUCED FROM A FIT TO D(SIG)/DT IN T HE COULOMB INTERFERENCE REGION (-T = 0.002 TO 0.04 GEV**2).