Measurement of total and partial photon proton cross sections at 180 GeV center of mass energy

1994 ◽  
Vol 63 (3) ◽  
pp. 391-408 ◽  
Author(s):  
◽  
M. Derrick ◽  
D. Krakauer ◽  
S. Magill ◽  
B. Musgrave ◽  
...  
Keyword(s):  
Cross Sections ◽  
Center Of Mass ◽  
Mass Energy ◽  
Center Of Mass Energy

scholarly journals Proton Spectra from He3+T and He3+He3 Fusion at Low Center-of-Mass Energy, with Potential Implications for Solar Fusion Cross Sections

2017 ◽  
Vol 119 (22) ◽  
Author(s):  
A. B. Zylstra ◽  
J. A. Frenje ◽  
M. Gatu Johnson ◽  
G. M. Hale ◽  
C. R. Brune ◽  
...  
Keyword(s):  
Cross Sections ◽  
Center Of Mass ◽  
Mass Energy ◽  
Center Of Mass Energy

scholarly journals Measurements of the vector boson production with the ATLAS detector

2018 ◽  
Vol 172 ◽  
pp. 03001
Author(s):  
A. Lapertosa
Keyword(s):  
Perturbative Qcd ◽  
High Precision ◽  
Cross Sections ◽  
Center Of Mass ◽  
Atlas Collaboration ◽  
Mass Energy ◽  
Ratio Measurement ◽  
Center Of Mass Energy ◽  
Proton Structure ◽  
8 Tev

Measurements of the Drell-Yan production of W and Z bosons at the LHC provide a benchmark of our understanding of perturbative QCD and probe the proton structure in a unique way. The ATLAS collaboration has performed new high precision measurements at a center-of-mass energy of 7 TeV. The measurements are performed for W+, W- and Z bosons integrated and as a function of the boson or lepton rapidity and the Z mass. Unprecedented precision is reached and strong constraints on Parton Distribution Functions, in particular the strange density are found. Z boson cross sections are also measured at center-of-mass energies of 8 TeV and 13 TeV, and cross-section ratios to the top-quark pair production have been derived. This ratio measurement leads to a cancellation of systematic effects and allows for a high precision comparison to the theory predictions. The production of jets in association with vector bosons is a further important process to study perturbative QCD in a multi-scale environment. The ATLAS collaboration has performed new measurements of Z boson plus jets cross sections, differential in several kinematic variables, in proton-proton collision data taken at a center-of-mass energy of 13 TeV. The measurements are compared to state-of-the art theory predictions. They are sensitive to higher-order pQCD effects, probe flavour and mass schemes and can be used to constrain the proton structure. In addition, a new measurement of the splitting scales of the kt jet-clustering algorithm for final states containing a Z boson candidate at a center-of-mass energy of 8 TeV is presented.

scholarly journals Study of π+π−π+π− production with CMD-3 detector at the VEPP-2000 collider

2019 ◽  
Vol 212 ◽  
pp. 04009
Author(s):  
A. A. Korobov ◽  
R. R. Akhmetshin ◽  
A. N. Amirkhanov ◽  
A. V. Anisenkov ◽  
V. M. Aulchenko ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Anomalous Magnetic Moment ◽  
Center Of Mass ◽  
Vector Current ◽  
Precision Measurements ◽  
Mass Energy ◽  
Muon Anomalous Magnetic Moment ◽  
Center Of Mass Energy ◽  
The Cross

The cross section of the process e+e−→ π+π−π+π− has been measured using an integrated luminosity of 17 pb−1 collected with the CMD-3 detector in the center-of-mass energy range 650-1000 MeV. High-precision measurements of various hadronic cross sections are of great interest in relation with the problem of the muon anomalous magnetic moment g-2. This measurement can be also used to test the relation between the cross section of e+e−→ π+ π−π+ π− and the spectral function for the τ−→ π−π0π0π0 decay predicted by the conservation of vector current (CVC).

Direct measurement of the cross sections for , and production by annihilation at the center-of-mass energy

2005 ◽  
Vol 727 (1-2) ◽  
pp. 395-405 ◽  
Author(s):  
M. Ablikim ◽  
J.Z. Bai ◽  
Y. Ban ◽  
J.G. Bian ◽  
X. Cai ◽  
...  
Keyword(s):  
Direct Measurement ◽  
Cross Sections ◽  
Center Of Mass ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
The Cross

Trace of nonperturbative charm content of the nucleon on Z + c-jet production

2017 ◽  
Vol 32 (16) ◽  
pp. 1750095
Author(s):  
S. Rostami ◽  
A. Khorramian
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Center Of Mass ◽  
Distribution Functions ◽  
Mass Energy ◽  
Parton Distribution Functions ◽  
Jet Production ◽  
Center Of Mass Energy ◽  
Intrinsic Charm ◽  
The Impact

We perform a comparison of the impact of different intrinsic charm (IC) models, based on the prediction of the differential cross-sections of [Formula: see text]-boson and [Formula: see text]-jet production in [Formula: see text] collision. It is shown that regardless of choosing the model, considering nonperturbative intrinsic charm component increases the magnitude of the cross-section when the [Formula: see text] transverse momentum grows or at large rapidity [Formula: see text] of the [Formula: see text]. Moreover, to evaluate the effect of different parton distribution functions (PDFs), we also compare the results of two PDF sets in prediction of production [Formula: see text]-jet in [Formula: see text] at a center-of-mass energy of 13 TeV with taking into account the intrinsic charm contribution in the proton. It is shown that the various PDF sets give some difference in the description of the [Formula: see text]-jet cross-section.

WW CROSS SECTIONS AND W BRANCHING FRACTIONS IN L3

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 329-332
Author(s):  
LUCA MALGERI
Keyword(s):  
Cross Sections ◽  
Branching Fractions ◽  
Center Of Mass ◽  
Mass Determination ◽  
Mass Energy ◽  
Statistical Accuracy ◽  
Center Of Mass Energy ◽  
Systematic Uncertainties ◽  
Large Center ◽  
Near Future

The measurements of W-pair cross sections performed by the L3 experiment at the LEP collider are herein reported. The statistics collected in the period 1996-2000 amounts to more than 8000 events distributed over a large center-of-mass energy range: 161–208 GeV. From the cross section measurements, also the W branching fractions in leptons and hadrons are derived with a percent precision: BR ( W → qq) = 68.47 ± 0.49 ± 0.33% and BR ( W → ℓν) = 10.51 ± 0.16 ± 0.11%. The improving statistical accuracy of the measurements is now approaching the systematic uncertainties. Further studies, necessary also for the W mass determination, will be needed in the near future to keep them under control.

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