scholarly journals Description of ϕ-meson production in hadronic and nuclear collisions at very high energies

2018 ◽  
Vol 33 (33) ◽  
pp. 1850202 ◽  
Author(s):  
G. H. Arakelyan ◽  
C. Merino ◽  
Yu. M. Shabelski
Keyword(s):  
Experimental Data ◽  
Production Cross ◽  
Meson Production ◽  
High Energy ◽  
Interesting Case ◽  
Wide Energy Range ◽  
Central Rapidity ◽  
Inclusive Density ◽  
Nuclear Targets ◽  
Very High

We expose the current experimental and theoretical situation of the interesting case of the production of [Formula: see text] mesons in up to very high energy collisions of hadrons on both nucleon and nuclear targets, and we present a quantitatively good theoretical description of the corresponding experimental data, based on the formalism of the well established Quark–Gluon String Model, that has proved to be valid for a wide energy range. All the available experimental data for [Formula: see text]-meson production in hadron–nucleon collisions on the spectra of secondary [Formula: see text], and on the ratios of [Formula: see text] and [Formula: see text] production cross-sections, as well the corresponding ones for [Formula: see text]-meson production on nuclear targets, are considered. In particular, it is seen that the production of [Formula: see text]-mesons on nuclear targets presents unusually small shadow corrections for the inclusive density in the central rapidity region.

scholarly journals On the origin of the TeV gamma-ray emission from Cygnus X-3

2019 ◽  
Vol 208 ◽  
pp. 14008
Author(s):  
V.G. Sinitsyna ◽  
V.Y. Sinitsyna
Keyword(s):  
Energy Range ◽  
Particle Production ◽  
Cosmic Ray ◽  
High Energy ◽  
Wide Energy Range ◽  
Electromagnetic Spectrum ◽  
Essential Information ◽  
Wide Range ◽  
Γ Ray ◽  
Very High

Cygnus X-3 binary system is a famous object studied over the wide range of electromagnetic spectrum. Early detections of ultra-high energy gamma-rays from Cygnus X-3 by Kiel, Havera Park and then by Akeno triggered the construction of several large air shower detectors. Also, Cygnus X-3 has been proposed to be one of the most powerful sources of charged cosmic ray particles in the Galaxy. The results of twenty-year observations of the Cyg X-3 binary at energies 800 GeV - 85 TeV are presented with images, spectra during periods of flaring activity and at low flux periods. The correlation of TeV flux increases with flaring activity at the lower energy range of X-ray and radio emission from the relativistic jets of Cygnus X-3 is found as well as 4.8-hour orbital modulation of TeV γ-ray intensity. Detected modulation of TeV γ-ray emission with orbit and important characteristics of Cyg X-3 such as the high luminosity of the companion star and the close orbit leads to an efficient generation of γ-ray emission through inverse Compton scattering in this object. The different type variability of very high-energy γ-emission and correlation of radiation activity in the wide energy range can provide essential information on the mechanism of particle production up to very high energies.

scholarly journals A cloud-chamber investigation of penetrating showers

1946 ◽  
Vol 187 (1011) ◽  
pp. 464-479 ◽  
Keyword(s):  
Small Groups ◽  
Meson Production ◽  
High Energy ◽  
Cloud Chamber ◽  
Meson Spectrum ◽  
High Energy Electron ◽  
High Energies ◽  
Incident Nucleon ◽  
Very High ◽  
Counter Data

An account is given of a cloud-chamber investigation of penetrating showers. It is concluded that the cloud-chamber data are consistent with Jánossy’s counter data and also with the view that penetrating showers consist of a small number of penetrating ionizing particles which are mainly mesons. There is no evidence to show that the showers are produced by processes other than those postulated in the theory of meson production proposed by Hamilton, Heitler & Peng, together with the addition suggested by Jánossy, i. e. the emission of small groups of mesons every few centimetres of lead. There are given several photographs of showers of penetrating particles which may be examples of the successive production of penetrating particles by an incident nucleon and its recoil particles. The spectrum of the penetrating particles seems to be approximately of the same form as the meson spectrum at sea-level. Some 20% of penetrating showers are accompanied, in the cloud chamber, by what appear to be electron cascades. It is shown that these showers cannot be due to knock-on electrons, to high-energy electron cascades penetrating the whole thickness of the absorber, or to decay electrons unless a meson of lifetime less than 10 -10 sec. is postulated. It is suggested that these showers may be due to electrons or photons produced in processes which become important at very high energies, e. g. > 10 11 eV.

THE KNEE OF EAS SIZE SPECTRUM, MISSING COMPONENT AND VERY HIGH ENERGY MUONS

2005 ◽  
Vol 20 (29) ◽  
pp. 6846-6848 ◽  
Author(s):  
V. B. PETKOV
Keyword(s):  
Experimental Data ◽  
High Energy ◽  
Size Spectrum ◽  
Present Experimental Data ◽  
Shower Development ◽  
Very High Energy ◽  
Very High

Knee formation in the EAS size spectrum as a possible result of some portion of EAS's energy carried away by some missing EAS component is discussed. To explain the absence of the bump in calculated EAS size spectrum for the standard EAS development in the present day experiments, the model of "catastrophic" EAS development was proposed. The hypothesis that all the energy lost for the further shower development ELT finally passes into neutrino (¾ELT) and muons (¼ELT) is shown to be practically excluded by present experimental data.

scholarly journals Measurement of nuclide production cross section for lead and bismuth with proton in energy range from 0.4 GeV to 3.0 GeV

2020 ◽  
Vol 239 ◽  
pp. 06004
Author(s):  
Hiroki Matsuda ◽  
Shin-ichiro Meigo ◽  
Hiroki Iwamoto ◽  
Fujio Maekawa
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Cross Sections ◽  
Production Cross Section ◽  
Production Cross ◽  
High Energy ◽  
Production Yield ◽  
Thin Foils ◽  
Hpge Detectors ◽  
Decay Gamma

For the Accelerator-Driven nuclear transmutation System (ADS), nuclide production yield estimation in a lead-bismuth target is important to manage the target. However, experimental data of nuclide production yield by spallation and high-energy fission reactions are scarce. In order to obtain the experimental data, an experiment in J-PARC using natPb and 209Bi samples were carried out. The samples were thin foils with about 0.1 mm thick and 25 mm × 25 mm square and were irradiated with protons at kinematic energy points of 0.4GeV, 2.2GeV, and 3.0 GeV. After the irradiation, the nuclide production cross section was determined by spectroscopic measurement of decay gamma-rays from the samples with HPGe detectors. In this paper, 14 nuclide production cross sections for lead and bismuth were obtained. They were compared with the calculated cross sections with various models and the evaluated one.

scholarly journals Investigation of abnormal absorption of cosmic-ray hadrons in lead calorimeters

2019 ◽  
Vol 208 ◽  
pp. 06001
Author(s):  
A.S. Borisov ◽  
V.G. Denisova ◽  
V.I. Galkin ◽  
Z.M. Guseva ◽  
E.A. Kanevskaya ◽  
...  
Keyword(s):  
Particle Production ◽  
Production Cross ◽  
Cosmic Ray ◽  
High Energy ◽  
Tien Shan ◽  
Kinematic Region ◽  
Detailed Simulation ◽  
Very High Energy ◽  
Forward Kinematic ◽  
Very High

A phenomenon of abnormally weak absorption of very high energy cosmic ray hadrons in thick lead blocks is discussed. This phenomenon was first observed in a Tien Shan high altitude experiment to study hadronic cores of extensive air showers (EAS) with a deep ionization calorimeter and encouraged researchers to introduce the hypothesis of the so-called long-flying or penetrating cosmic ray component. A similar effect was detected later with deep uniform lead X-ray emulsion chambers (XREC) at the Pamirs, which we discuss in detail. To establish the nature of the phenomenon we are have carried out dedicated experiments at the Tien Shan and at the Pamirs by exposing two-storey XRECs with large air gaps. According to detailed simulation of the chamber response, these experiments are very sensitive to the production of charmed hadrons in the forward kinematic region and can prove a hypothesis that the phenomenon under study can be explained on the assumption of very high values of charm particle production cross section at 〈ELab〉 ~ 75 TeV in the forward kinematic region at xLab ≳ 0.1 which are near the upper limit of recent results of collider experiments, i.e., σpp→c¯c ~ 8 mb. The same factor makes it possible to fit all the features of the experimental hadron absorption curve observed by means of deep uniform lead XRECs, including its bending at a depth of ~ 70 c.u.

scholarly journals Improved $$(g-2)_\mu $$ measurements and supersymmetry

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
Manimala Chakraborti ◽  
Sven Heinemeyer ◽  
Ipsita Saha
Keyword(s):  
Experimental Data ◽  
Standard Model ◽  
Cross Sections ◽  
Direct Detection ◽  
Production Cross ◽  
High Energy ◽  
Experimental Result ◽  
Supersymmetric Particle ◽  
Negative Results ◽  
Upper Limits

AbstractThe electroweak (EW) sector of the Minimal Supersymmetric Standard Model (MSSM) can account for variety of experimental data. The lighest supersymmetric particle (LSP), which we take as the lightest neutralino, $${\tilde{\chi }}_{1}^0$$ χ ~ 1 0 , can account for the observed Dark Matter (DM) content of the universe via coannihilation with the next-to-LSP (NLSP), while being in agreement with negative results from Direct Detection (DD) experiments. Owing to relatively small production cross-sections a comparably light EW sector of the MSSM is also in agreement with the unsuccessful searches at the LHC. Most importantly, the EW sector of the MSSM can account for the persistent $$3-4\,\sigma $$ 3 - 4 σ discrepancy between the experimental result for the anomalous magnetic moment of the muon, $$(g-2)_\mu $$ ( g - 2 ) μ , and its Standard Model (SM) prediction. Under the assumption that the $${\tilde{\chi }}_{1}^0$$ χ ~ 1 0 provides the full DM relic abundance we first analyze which mass ranges of neutralinos, charginos and scalar leptons are in agreement with all experimental data, including relevant LHC searches. We find an upper limit of $$\sim 600 \,\, \mathrm {GeV}$$ ∼ 600 GeV for the LSP and NLSP masses. In a second step we assume that the new result of the Run 1 of the “MUON G-2” collaboration at Fermilab yields a precision comparable to the existing experimental result with the same central value. We analyze the potential impact of the combination of the Run 1 data with the existing $$(g-2)_\mu $$ ( g - 2 ) μ data on the allowed MSSM parameter space. We find that in this case the upper limits on the LSP and NLSP masses are substantially reduced by roughly $$100 \,\, \mathrm {GeV}$$ 100 GeV . This would yield improved upper limits on these masses of $$\sim 500 \,\, \mathrm {GeV}$$ ∼ 500 GeV . In this way, a clear target could be set for future LHC EW searches, as well as for future high-energy $$e^+e^-$$ e + e -  colliders, such as the ILC or CLIC.

BOSON INTERFEROMETRY: A REVIEW OF HIGH ENERGY DATA AND ITS INTERPRETATION

1989 ◽  
Vol 04 (12) ◽  
pp. 2861-2896 ◽  
Author(s):  
BENGT LÖRSTAD
Keyword(s):  
Experimental Data ◽  
Reaction Mechanism ◽  
Interference Effect ◽  
High Energy ◽  
Energy Data ◽  
Absolute Value ◽  
Main Variable ◽  
Bose Einstein ◽  
Very High ◽  
Significant Data

Experimental data on the correlation of identical bosons are reviewed and the interpretation discussed. A revived interest in the study of the Bose-Einstein effect has evolved after new significant data from collisions at high energy. There is evidence that it looks the same in general events of all kinds of reactions and that the main variable in describing the effect is the absolute value of the four-momentum transfer Q. There is a dependence on multiplicity density at high energy, and furthermore there is an indication of a special reaction mechanism for selected events of very high multiplicity density. New experiments planned are dedicated to studies of the different aspects of this interference effect.

scholarly journals ATMOSPHERIC MUON FLUX AT PEV ENERGIES

2010 ◽  
Vol 25 (18n19) ◽  
pp. 3733-3740 ◽  
Author(s):  
S. I. SINEGOVSKY ◽  
A. A. KOCHANOV ◽  
T. S. SINEGOVSKAYA ◽  
A. MISAKI ◽  
N. TAKAHASHI
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
High Energy ◽  
Muon Flux ◽  
Muon Spectrum ◽  
High Energy Muon ◽  
Very High Energy ◽  
Atmospheric Muon ◽  
Near Future ◽  
Very High

In the near future, the energy region above few hundreds of TeV may really be accessible for measurements of the atmospheric muon spectrum with IceCube array. Therefore, one expects that muon flux uncertainties above 50 TeV, related to a poor knowledge of charm production cross-sections and insufficiently examined primary spectra and composition, will be diminished. We give predictions for the very high-energy muon spectrum at sea level, obtained with the three hadronic interaction models, taking into account also the muon contribution due to decays of the charmed hadrons.

scholarly journals Improved $${(g-2)_\mu }$$ measurements and wino/higgsino dark matter

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
Manimala Chakraborti ◽  
Sven Heinemeyer ◽  
Ipsita Saha
Keyword(s):  
Experimental Data ◽  
Dark Matter ◽  
Standard Model ◽  
Cross Sections ◽  
Direct Detection ◽  
Production Cross ◽  
High Energy ◽  
Experimental Result ◽  
Supersymmetric Particle ◽  
Relic Density

AbstractThe electroweak (EW) sector of the Minimal Supersymmetric Standard Model (MSSM) can account for a variety of experimental data. In particular it can explain the persistent $$3-4\,\sigma $$ 3 - 4 σ discrepancy between the experimental result for the anomalous magnetic moment of the muon, $$(g-2)_\mu $$ ( g - 2 ) μ , and its Standard Model (SM) prediction. The lightest supersymmetric particle (LSP), which we take as the lightest neutralino, $${\tilde{\chi }}_{1}^0$$ χ ~ 1 0 , can furthermore account for the observed Dark Matter (DM) content of the universe via coannihilation with the next-to-LSP (NLSP), while being in agreement with negative results from Direct Detection (DD) experiments. Concerning the unsuccessful searches for EW particles at the LHC, owing to relatively small production cross-sections a comparably light EW sector of the MSSM is in full agreement with the experimental data. The DM relic density can fully be explained by a mixed bino/wino LSP. Here we take the relic density as an upper bound, which opens up the possibility of wino and higgsino DM. We first analyze which mass ranges of neutralinos, charginos and scalar leptons are in agreement with all experimental data, including relevant LHC searches. We find roughly an upper limit of $$\sim 600 \,\, \mathrm {GeV}$$ ∼ 600 GeV for the LSP and NLSP masses. In a second step we assume that the new result of the Run 1 of the “MUON G-2” collaboration at Fermilab yields a precision comparable to the existing experimental result with the same central value. We analyze the potential impact of the combination of the Run 1 data with the existing $$(g-2)_\mu $$ ( g - 2 ) μ data on the allowed MSSM parameter space. We find that in this case the upper limits on the LSP and NLSP masses are substantially reduced by roughly $$100 \,\, \mathrm {GeV}$$ 100 GeV . We interpret these upper bounds in view of future HL-LHC EW searches as well as future high-energy $$e^+e^-$$ e + e -  colliders, such as the ILC or CLIC.

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