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Measurement of high-$Q^2$ charged-current $e^+p$ deep inelastic scattering cross sections at HERA
- Source :
- Scopus-Elsevier, European Physical Journal C: Particles and Fields, 12 (3), European Physical Journal C, 12, 411-428. Springer New York
- Publication Year :
- 2000
-
Abstract
- The e^+p charged-current deep inelastic scattering cross sections, $d\sigma/dQ^2$ for Q^2 between 200 and 60000 GeV^2, and $d\sigma/dx$ and $d\sigma/dy$ for Q^2 > 200 GeV^2, have been measured with the ZEUS detector at HERA. A data sample of 47.7 pb^-1, collected at a center-of-mass energy of 300 GeV, has been used. The cross section $d\sigma/dQ^2$ falls by a factor of about 50000 as Q^2 increases from 280 to 30000 GeV^2. The double differential cross section $d^2\sigma/dxdQ^2$ has also been measured. A comparison between the data and Standard Model (SM) predictions shows that contributions from antiquarks ($\bar{u}$ and $\bar{c}$) and quarks (d and s) are both required by the data. The predictions of the SM give a good description of the full body of the data presented here. A comparison of the charged-current cross section $d\sigma/dQ^2$ with the recent ZEUS results for neutral-current scattering shows that the weak and electromagnetic forces have similar strengths for Q^2 above $M^2_W, M^2_Z$. A fit to the data for $d\sigma/dQ^2$ with the Fermi constant $G_F$ and $M_W$ as free parameters yields $G_F = (1.171 \pm 0.034 (stat.) ^{+0.026}_{-0.032} (syst.) ^{+0.016}_{-0.015} (PDF)) \times 10^{-5} GeV^{-2}$ and $M_W = 80.8 ^{+4.9}_{-4.5} (stat.) ^{+5.0}_{-4.3} (syst.) ^{+1.4}_{-1.3} (PDF) GeV$. Results for $M_W$, where the propagator effect alone or the SM constraint between $G_F$ and $M_W$ have been considered, are also presented.<br />Comment: 34 pages including 10 figures and 6 tables; added tables for correlated and uncorrelated systematic uncertainties and fixed the total systematic uncertainty for dsigma/dxdQ2 (Table 4 and Figs.7-8); erratum submitted to Eur. Phys. J
- Subjects :
- Particle physics
MONTE-CARLO GENERATOR
Physics and Astronomy (miscellaneous)
FOS: Physical sciences
Weak interaction
Inelastic scattering
PROTON SCATTERING
01 natural sciences
7. Clean energy
JET FRAGMENTATION
High Energy Physics - Experiment
Standard Model
Nuclear physics
High Energy Physics - Experiment (hep-ex)
ZEUS
CENTRAL TRACKING DETECTOR
ZEUS BARREL CALORIMETER
RADIATIVE-CORRECTIONS
PARTON DISTRIBUTIONS
NUCLEON SCATTERING
BOSON PRODUCTION
EVENT GENERATOR
0103 physical sciences
010306 general physics
Engineering (miscellaneous)
Event generator
Physics
Research Groups and Centres\Physics\Low Temperature Physics
Neutral current
010308 nuclear & particles physics
Faculty of Science\Physics
HERA
Deep inelastic scattering
Energy (signal processing)
Subjects
Details
- ISSN :
- 14346044
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- European Physical Journal C
- Accession number :
- edsair.doi.dedup.....fe1eecaee2fe5d53e3eabe9c8ed8d4d9