scholarly journals Small-x saturation in forward hadronic interactions

2019 ◽  
Vol 208 ◽  
pp. 12001
Author(s):  
Hirotsugu Fujii
Keyword(s):  
Particle Production ◽  
Charm Quark ◽  
Cosmic Ray ◽  
High Energy ◽  
High Energy Particle ◽  
Hadronic Interactions ◽  
Longitudinal Correlation ◽  
Quark Production ◽  
Small X ◽  
Limiting Fragmentation

After a brief introduction of parton saturation in hadrons at small Bjorken's x, we recapitulate its phenomenological implications in high-energy particle production, such as longitudinal correlation, particle mulctiplicity, limiting fragmentation and charm quark production, which may have relevance to study of highenergy cosmic ray physics.

scholarly journals Measurements and tests of hadronic interactions at ultra-high energies with the Pierre Auger Observatory

2019 ◽  
Vol 210 ◽  
pp. 02002
Author(s):  
Lorenzo Cazon ◽  
Keyword(s):  
Particle Production ◽  
Center Of Mass ◽  
Cosmic Ray ◽  
High Energy ◽  
Air Showers ◽  
Complex Objects ◽  
Hadronic Interactions ◽  
Center Of Mass Energy ◽  
Surface Detector ◽  
Good Agreement

Extensive air showers are complex objects, resulting of billions of particle reactions initiated by single cosmic ray at ultra-high-energy. Their characteristics are sensitive both to the mass of the primary cosmic ray and to the details of hadronic interactions. Many of the interactions that determine the shower features occur in kinematic regions and at energies beyond those tested by human-made accelerators. We will report on the measurement of the proton-air cross section for particle production at a center-of-mass energy per nucleon of 39 TeV and 56 TeV. We will also show comparisons of post-LHC hadronic interaction models with shower data by studying the moments of the distribution of the depth of the electromagnetic maximum, the number and production depth of muons in air showers, and finally a parameter based on the rise-time of the surface detector signal, sensitive to the electromagnetic and muonic component of the shower. While there is good agreement found for observables based on the electromagnetic shower component, discrepancies are observed for muon-sensitive quantities.

scholarly journals Opening Remarks ~ Prospects of very high energy cosmic ray interactions for astroparticle physics

2019 ◽  
Vol 208 ◽  
pp. 01001
Author(s):  
Yoshitaka Itow
Keyword(s):  
Cosmic Rays ◽  
Particle Production ◽  
Cosmic Ray ◽  
High Energy ◽  
Hadronic Interactions ◽  
High Energy Cosmic Rays ◽  
Cosmic Ray Interactions ◽  
Precise Knowledge ◽  
Very High Energy ◽  
Very High

Hadronic interactions of very high energy cosmic rays have been studied in various aspects of motivation. In recent decades, mainly motivated by air shower experiments, modelling of very high energy cosmic ray interactions have been greatly improved together with new data obtained from high energy colliders such as the LHC. Regarding recent rapid progress of multi-messenger astronomy, a precise knowledge on secondary particle production by cosmic rays at very high energy is largely indispensable. This would give us a new insight and new motivation to study minimum bias hadronic interactions of very high energy cosmic rays.

PARTICLE PRODUCTION AT COLLIDER ENERGIES

1989 ◽  
Vol 04 (07) ◽  
pp. 1527-1680 ◽  
Author(s):  
CHRISTOPH GEICH-GIMBEL
Keyword(s):  
Particle Physics ◽  
Particle Production ◽  
Cosmic Ray ◽  
Parton Model ◽  
High Energy ◽  
High Energy Particle ◽  
Final State ◽  
Long Range Correlations ◽  
Vector Bosons ◽  
Order Of Magnitude

High energy particle physics, which has been trying to understand and to devise new laws governing nature at per particle energies far beyond everyday energies, has entered a new episode. Having surpassed the ‘low energy’ regime, where (s channel) resonance production dominantly projects onto the final state, very interesting features of the strong interaction arose at c.m. energies in the tens of GEV range, as found at the CERN Intersecting Storage Rings (ISR). One recalls the onset of hard scattering processes, which was understood as a scattering between constituents of the nucleon, hence supporting the Quark Parton Model (QPM). Surprisingly enough the total cross section started to rise again, when it was initially believed to have reached a constant value, suggesting an asymptotia. Furthermore correlations among the final state particles produced were observed, and especially long range correlations, which must reflect dynamical laws. The advent of the CERN [Formula: see text] Collider, with c.m. energies up to 900 GeV, representing a step of more than an order of magnitude in the energy available, puts one into a position to test more directly many of these ‘new’ things and to prove the existence of the elusive intermediate vector bosons W± and Z, thus unifying weak and electromagnetic interactions. Finally a bridge to cosmic ray results at extreme energies may be provided. Naturally quite a lot of new unanswered questions will emerge in the investigations of Collider data, since new regions bring new surprises, but this possibility should be regarded as a means of gaining new insights, rather than as a disturbance of hitherto believed regularities, of which some inevitably fail. In this spirit the following article is written.

scholarly journals High energy cosmic ray interactions and UHECR composition problem

2019 ◽  
Vol 210 ◽  
pp. 02001
Author(s):  
Sergey Ostapchenko
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Cosmic Rays ◽  
Cosmic Ray ◽  
High Energy ◽  
Ultra High Energy ◽  
Hadronic Interactions ◽  
High Energy Cosmic Rays ◽  
Cosmic Ray Interactions ◽  
Composition Problem

The differences between contemporary Monte Carlo generators of high energy hadronic interactions are discussed and their impact on the interpretation of experimental data on ultra-high energy cosmic rays (UHECRs) is studied. Key directions for further model improvements are outlined. The prospect for a coherent interpretation of the data in terms of the UHECR composition is investigated.

scholarly journals High-Energy Multimessenger Transient Astrophysics

2019 ◽  
Vol 69 (1) ◽  
pp. 477-506 ◽  
Author(s):  
Kohta Murase ◽  
Imre Bartos
Keyword(s):  
Time Domain ◽  
Particle Production ◽  
High Energy ◽  
High Energy Particle ◽  
Energy Particle ◽  
Transient Phenomena ◽  
New Era ◽  
Astrophysical Objects ◽  
High Energy Emission

The recent discoveries of high-energy cosmic neutrinos and gravitational waves from astrophysical objects have led to a new era of multimessenger astrophysics. In particular, electromagnetic follow-up observations triggered by these cosmic signals have proved to be highly successful and have brought about new opportunities in time-domain astronomy. We review high-energy particle production in various classes of astrophysical transient phenomena related to black holes and neutron stars, and discuss how high-energy emission can be used to reveal the underlying physics of neutrino and gravitational-wave sources.

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 Average shape of longitudinal shower profiles measured at the Pierre Auger Observatory

2019 ◽  
Vol 210 ◽  
pp. 02015
Author(s):  
Sofia Andringa ◽  
Keyword(s):  
Cosmic Ray ◽  
High Energy ◽  
Pierre Auger Observatory ◽  
Composition Analysis ◽  
Shape Parameters ◽  
Hadronic Interactions ◽  
Shower Development ◽  
Shower Maximum ◽  
Detailed Composition ◽  
First Time

The average profiles of cosmic ray shower development as a function of atmospheric depth are measured for the first time with the Fluorescence Detectors at the Pierre Auger Observatory. The profile shapes are well reproduced by the Gaisser-Hillas parametrization at the 1% level in a 500 g/cm2 interval around the shower maximum, for cosmic rays with log(E/eV) > 17.8. The results are quantified with two shape parameters, measured as a function of energy. The average profiles carry information on the primary cosmic ray and its high energy hadronic interactions. The shape parameters predicted by the commonly used models are compatible with the measured ones within experimental uncertainties. Those uncertainties are dominated by systematics which, at present, prevent a detailed composition analysis.

Ion Heating and High-Energy-Particle Production by Ion-Cyclotron Heating in the Large Helical Device

2000 ◽  
Vol 85 (21) ◽  
pp. 4530-4533 ◽  
Author(s):  
T. Mutoh ◽  
R. Kumazawa ◽  
T. Seki ◽  
T. Watari ◽  
K. Saito ◽  
...  
Keyword(s):  
Particle Production ◽  
High Energy ◽  
High Energy Particle ◽  
Energy Particle ◽  
Ion Heating ◽  
Ion Cyclotron

Astrophysics and Particle Physics in Space with the Alpha Magnetic Spectrometer

2003 ◽  
Vol 18 (28) ◽  
pp. 1951-1966 ◽  
Author(s):  
Giovanni Lamanna
Keyword(s):  
Particle Physics ◽  
Gamma Ray ◽  
Space Shuttle ◽  
Space Station ◽  
Cosmic Ray ◽  
High Energy ◽  
Magnetic Spectrometer ◽  
High Energy Particle ◽  
Physics Experiment ◽  
Alpha Magnetic Spectrometer

The Alpha Magnetic Spectrometer (AMS) is a high energy particle physics experiment in space scheduled to be installed on the International Space Station (ISS) by 2006 for a three-year mission. After a precursor flight of a prototype detector on board of the NASA Space Shuttle in June 1998, the construction of the detector in its final configuration is started and it will be completed by 2004. The purpose of this experiment is to provide a high statistics measurement of charged particles and nuclei in rigidity range 0.5 GV to few TV and to explore the high-energy (> 1 GeV ) gamma-ray sky. In this paper we describe the detector layout and present an overview of the main scientific goals both in the domain of astrophysics: cosmic-ray origin, age and propagation and the exploration of the most energetic gamma-ray sources; and in the domain of astroparticle: the anti-matter and the dark matter searches.

scholarly journals GRAVITATIONAL LENSING IN THE WEAK FIELD LIMIT BY A BRANEWORLD BLACK HOLE

2005 ◽  
Vol 20 (32) ◽  
pp. 2487-2496 ◽  
Author(s):  
A. S. MAJUMDAR ◽  
NUPUR MUKHERJEE
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Gravitational Lensing ◽  
Cosmic Ray ◽  
Weak Field ◽  
High Energy ◽  
High Energy Particle ◽  
Field Limit ◽  
Weak Field Limit ◽  
Point Light

The existence of braneworld black holes may be of primordial origin, or may even be produced in high energy particle collisions in the laboratory and in cosmic ray showers as well. These black holes obey a modified mass–radius relationship compared to standard Schwarzschild black holes. Using the variational principle we calculate the bending angle of a light ray near the horizon of a braneworld black hole in the weak field limit. We next derive the expressions of several lensing quantities like the Einstein radius and the magnification for a point light source. These expressions are modified compared to the lensing quantities for standard Schwarzschild black holes and contain the scale of the extra dimensions.

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