Review of Particle Physics Workman, R L; Klempt, E; Agashe, K ...
Progress of theoretical and experimental physics,
08/2022, Volume:
2022, Issue:
8
Journal Article
Peer reviewed
Open access
Abstract
The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 2,143 new measurements from 709 papers, we list, evaluate, and average measured ...properties of gauge bosons and the recently discovered Higgs boson, leptons, quarks, mesons, and baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle properties and search limits are listed in Summary Tables. We give numerous tables, figures, formulae, and reviews of topics such as Higgs Boson Physics, Supersymmetry, Grand Unified Theories, Neutrino Mixing, Dark Energy, Dark Matter, Cosmology, Particle Detectors, Colliders, Probability and Statistics. Among the 120 reviews are many that are new or heavily revised, including a new review on Machine Learning, and one on Spectroscopy of Light Meson Resonances.
The Review is divided into two volumes. Volume 1 includes the Summary Tables and 97 review articles. Volume 2 consists of the Particle Listings and contains also 23 reviews that address specific aspects of the data presented in the Listings.
The complete Review (both volumes) is published online on the website of the Particle Data Group (pdg.lbl.gov) and in a journal. Volume 1 is available in print as the PDG Book. A Particle Physics Booklet with the Summary Tables and essential tables, figures, and equations from selected review articles is available in print, as a web version optimized for use on phones, and as an Android app.
Atomic Oxygen in the Ionospheric E Layer Golubkov, G. V.; Maslov, T. A.; Bychkov, V. L. ...
Russian journal of physical chemistry. B,
09/2020, Volume:
14, Issue:
5
Journal Article
Peer reviewed
The diagnostics of nonequilibrium two-temperature plasma parameters in the D and E layers of the lower ionosphere are required to improve the operation of satellite navigation systems, flight tests ...with the use of gas-discharge devices, and remote sensing of the Earth’s surface. Together with the main neutral atmospheric molecules of nitrogen and oxygen, excited states of oxygen atoms play an important role in the exchange reactions. This work is devoted to calculating the concentration of atomic oxygen generated during photodissociation in the E layer of the Earth’s ionosphere (at altitudes from 90 to 105 km). The calculation results are in a good agreement with the existing experimental and theoretical data. The role of direct dissociation of oxygen molecules under the action of fast electrons is discussed; it is shown that the process is not dominant.
Search for heavy neutrino in K+→μ+νH decay Sadovsky, A. S.; Kurshetsov, V. F.; Filin, A. P. ...
The European physical journal. C, Particles and fields,
02/2018, Volume:
78, Issue:
2
Journal Article
Peer reviewed
Open access
A high statistics data sample of the
K
+
→
μ
+
ν
μ
decay was accumulated by the OKA experiment in 2012. The missing mass analysis was performed to search for the decay channel
K
+
→
μ
+
ν
H
with a ...hypothetic stable heavy neutrino in the final state. The obtained missing mass spectrum does not show peaks that could be attributed to existence of stable heavy neutrinos in the mass range
(
270
<
m
ν
H
<
375
)
MeV
/
c
2
. As a result, upper limits on the branching ratio and on the value of the mixing element
|
U
μ
H
|
2
are obtained.
Review of Particle Physics Barnett, R M; Beringer, J; Dahl, O ...
Progress of theoretical and experimental physics,
2020, Volume:
2020, Issue:
8
Journal Article
Peer reviewed
Open access
Abstract
The Review summarizes much of particle physics and cosmology. Using data from previous editions, plus 3,324 new measurements from 878 papers, we list, evaluate, and average measured ...properties of gauge bosons and the recently discovered Higgs boson, leptons, quarks, mesons, and baryons. We summarize searches for hypothetical particles such as supersymmetric particles, heavy bosons, axions, dark photons, etc. Particle properties and search limits are listed in Summary Tables. We give numerous tables, figures, formulae, and reviews of topics such as Higgs Boson Physics, Supersymmetry, Grand Unified Theories, Neutrino Mixing, Dark Energy, Dark Matter, Cosmology, Particle Detectors, Colliders, Probability and Statistics. Among the 120 reviews are many that are new or heavily revised, including a new review on High Energy Soft QCD and Diffraction and one on the Determination of CKM Angles from B Hadrons.
The Review is divided into two volumes. Volume 1 includes the Summary Tables and 98 review articles. Volume 2 consists of the Particle Listings and contains also 22 reviews that address specific aspects of the data presented in the Listings.
The complete Review (both volumes) is published online on the website of the Particle Data Group (pdg.lbl.gov) and in a journal. Volume 1 is available in print as the PDG Book. A Particle Physics Booklet with the Summary Tables and essential tables, figures, and equations from selected review articles is available in print and as a web version optimized for use on phones as well as an Android app.
Using a two-component model for the structure of the circumstellar nebulae of WR and O stars, we predict that their emission may be variable on time scales from several months to several years. This ...variability should be manifest as an enhancement of the emission luminosities of separate compact regions in the hydrogen Balmer lines, HeII ion line, and nebular lines of the ions OII, OIII, NeIII, and NeIV. In the model considered, this line variability reflects non-stationary ionization, cooling, and recombination behind a shock propagating inward in the cloud. The set of lines that are variable depends on the shock velocity, while the scale of the variability decreases with increasing cloud density.
Abstract A precise measurement of the vector and axial-vector form factors difference $$F_V-F_A$$ FV-FA in the $$K^+\rightarrow {\mu ^+}{\nu _{\mu }}{\gamma }$$ K+→μ+νμγ decay is presented. About 95K ...events of $$K^+\rightarrow {\mu ^+}{\nu _{\mu }}{\gamma }$$ K+→μ+νμγ are selected in the OKA experiment. The result is $$F_V-F_A=0.134\pm 0.021(stat)\pm 0.027(syst)$$ FV-FA=0.134±0.021(stat)±0.027(syst) . Both errors are smaller than in the previous $$F_V-F_A$$ FV-FA measurements.
We use a two-phase model for the structure of the circumstellar nebulae of hot stars to analyze the radiative cooling of a dense, compact cloud behind the shock produced by the compression of the ...cloud by hot gas from the stellar wind, taking into account ionization and heating by radiation from the central star. We can distinguish three stages of the evolution of the cloud during its compression. In the first stage, relevant for the entire cloud before compression and the gas ahead of the shock front, the state of the gas is determined purely by ionization by the stellar radiation. The next stage is characterized by the simultaneous action of two gas excitation mechanisms—photoionization by the stellar radiation and shock heating. In this stage, the gas intensively radiates thermal energy received at the shock front. After radiative cooling, in the final stage, ionization and heating of the gas are again determined mainly by the star. To compute the spectrum of the cloud radiation, we solved for the propagation of a plane-parallel, homogeneous flux through the shock front in the radiation field of the hot star. The computations show that a combination of two excitation mechanisms considerably enriches the theoretical spectrum. The relative intensities of emission lines of a single cloud may resemble either those for an HII region or of a supernova remnant.
Study of the decay K+→π+π-π+γ in the OKA experiment Shapkin, M. M.; Akimenko, S. A.; Artamonov, A. V. ...
The European physical journal. C, Particles and fields,
04/2019, Volume:
79, Issue:
4
Journal Article
Peer reviewed
Open access
A high statistics data sample of the decays of
K
+
mesons to three charged particles was accumulated by the OKA experiment in 2012 and 2013. This allowed to select a clean sample of about 450 events ...with
K
+
→
π
+
π
-
π
+
γ
decays with the energy of the photon in the kaon rest frame greater than 30 MeV. The measured branching fraction of the
K
+
→
π
+
π
-
π
+
γ
, with
E
γ
∗
>
30
MeV
is equal to
(
0.71
±
0.05
)
×
10
-
5
. The measured differential branching fraction over photon energy is compared with the prediction of the chiral perturbation theory to
O
(
p
4
)
. A search for an up-down asymmetry of the photon with respect to the hadronic system decay plane is also performed.
A precise measurement of the vector and axial-vector form factors difference
F
V
-
F
A
in the
K
+
→
μ
+
ν
μ
γ
decay is presented. About 95K events of
K
+
→
μ
+
ν
μ
γ
are selected in the OKA ...experiment. The result is
F
V
-
F
A
=
0.134
±
0.021
(
s
t
a
t
)
±
0.027
(
s
y
s
t
)
. Both errors are smaller than in the previous
F
V
-
F
A
measurements.
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