Heavy-particle production by cosmic rays

1979 ◽  
Vol 19 (1) ◽  
pp. 234-238 ◽  
Author(s):  
Nathan Isgur ◽  
Stephen Wolfram
Keyword(s):  
Cosmic Rays ◽  
Particle Production ◽  
Heavy Particle

Erratum: Heavy-particle production by cosmic rays

1979 ◽  
Vol 20 (3) ◽  
pp. 821-821
Author(s):  
Nathan Isgur ◽  
Stephen Wolfram
Keyword(s):  
Cosmic Rays ◽  
Particle Production ◽  
Heavy Particle

PARTON DISTRIBUTION FUNCTIONS AND THE QCD-IMPROVED PARTON MODEL — AN OVERVIEW

1987 ◽  
Vol 02 (04) ◽  
pp. 1369-1387 ◽  
Author(s):  
Wu-Ki Tung
Keyword(s):  
Parton Distribution ◽  
Particle Production ◽  
Heavy Particle ◽  
Parton Model ◽  
Distribution Functions ◽  
Collider Physics ◽  
Parton Distribution Functions ◽  
Parton Distributions ◽  
First Order ◽  
Small X

Some non-trivial features of the QCD-improved parton model relevant to applications on heavy particle production and semi-hard (small-x) processes of interest to collider physics are reviewed. The underlying ideas are illustrated by a simple example. Limitations of the naive parton formula as well as first order corrections and subtractions to it are dis-cussed in a quantitative way. The behavior of parton distribution functions at small x and for heavy quarks are discussed. Recent work on possible impact of unconventional small-x behavior of the parton distributions on small-x physics at SSC and Tevatron are summarized. The Drell-Yan process is found to be particularly sensitive to the small x dependence of parton distributions. Measurements of this process at the Tevatron can provide powerful constraints on the expected rates of semi-hard processes at the SSC.

scholarly journals The scalar chemical potential in cosmological collider physics

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Arushi Bodas ◽  
Soubhik Kumar ◽  
Raman Sundrum
Keyword(s):  
Particle Production ◽  
Chemical Potential ◽  
Direct Detection ◽  
Heavy Particle ◽  
Scalar Particle ◽  
Energy Scale ◽  
Fine Tuning ◽  
Tree Level ◽  
Heavy Particles ◽  
Non Gaussian

Abstract Non-analyticity in co-moving momenta within the non-Gaussian bispectrum is a distinctive sign of on-shell particle production during inflation, presenting a unique opportunity for the “direct detection” of particles with masses as large as the inflationary Hubble scale (H). However, the strength of such non-analyticity ordinarily drops exponentially by a Boltzmann-like factor as masses exceed H. In this paper, we study an exception provided by a dimension-5 derivative coupling of the inflaton to heavy-particle currents, applying it specifically to the case of two real scalars. The operator has a “chemical potential” form, which harnesses the large kinetic energy scale of the inflaton, $$ {\overset{\cdot }{\phi}}_0^{1/2}\approx 60H $$ ϕ ⋅ 0 1 / 2 ≈ 60 H , to act as an efficient source of scalar particle production. Derivative couplings of inflaton ensure radiative stability of the slow-roll potential, which in turn maintains (approximate) scale-invariance of the inflationary correlations. We show that a signal not suffering Boltzmann suppression can be obtained in the bispectrum with strength fNL ∼ $$ \mathcal{O} $$ O (0.01–10) for an extended range of scalar masses $$ \lesssim {\overset{\cdot }{\phi}}_0^{1/2} $$ ≲ ϕ ⋅ 0 1 / 2 , potentially as high as 1015 GeV, within the sensitivity of upcoming LSS and more futuristic 21-cm experiments. The mechanism does not invoke any particular fine-tuning of parameters or breakdown of perturbation-theoretic control. The leading contribution appears at tree-level, which makes the calculation analytically tractable and removes the loop-suppression as compared to earlier chemical potential studies of non-zero spins. The steady particle production allows us to infer the effective mass of the heavy particles and the chemical potential from the variation in bispectrum oscillations as a function of co-moving momenta. Our analysis sets the stage for generalization to heavy bosons with non-zero spin.

scholarly journals Linked Heavy Particle Model and Multiple Particle Production

1964 ◽  
Vol 31 (5) ◽  
pp. 840-857 ◽  
Author(s):  
Tetsuro Kobayashi ◽  
Mikio Namiki ◽  
Ichiro Ohba
Keyword(s):  
Particle Production ◽  
Heavy Particle ◽  
Particle Model ◽  
Multiple Particle Production ◽  
Multiple Particle

Some general properties of radiation processes as related to "secondary" cosmic rays

1968 ◽  
Vol 46 (10) ◽  
pp. S1003-S1005 ◽  
Author(s):  
Frank C. Jones
Keyword(s):  
Cosmic Rays ◽  
Electron Energy ◽  
Power Law ◽  
Particle Production ◽  
Inverse Power ◽  
Characteristic Energy ◽  
Inverse Compton Scattering ◽  
Inverse Power Law ◽  
Radiation Processes ◽  
The Individual

The individual processes of synchrotron radiation and inverse Compton scattering produce quite different photon spectra for electrons of a given energy. However, an inverse power-law spectrum of electrons, j(γ) = k′γ−m, will produce a photon spectrum N(α) = Kα−(m+1)/2 for either process. The explanation for this lies in the fact that both individual radiation processes produce spectra of the form N(α) = F(αc/αc)(αc)−n where the characteristic energy αc is proportional to some power of the electron energy and contains all of the dependence on the electron energy that the spectrum exhibits. This form of the spectrum coupled with an inverse power-law electron spectrum produces the desired result. An investigation reveals that other radiation and secondary particle production processes possess this form of spectrum. This gives a very general explanation for the well-known fact that secondary particles, even those several generations removed from the primary cosmic rays, exhibit inverse power-law spectra.

scholarly journals Cross Section and Asymmetry Measurement of Very Forward Neutral Particle Production at RHIC

2016 ◽  
Vol 40 ◽  
pp. 1660110
Author(s):  
Yuji Goto
Keyword(s):  
Cosmic Rays ◽  
Particle Production ◽  
Spin Asymmetry ◽  
High Energy ◽  
Transverse Spin ◽  
Proton Collisions ◽  
High Energy Cosmic Rays ◽  
Air Shower ◽  
Production Processes ◽  
Polarized Proton

Although air shower observations at the surface of the earth have been developed in order to understand the origin of the ultra high energy cosmic rays, the observations have uncertainties in interpretation of the observed data from the present phenomenological nuclear collision models. Precision measurements of the very forward particle production in the collider experiments improve understanding of particle production processes in the nuclear collisions, and provide large influences on interpretation of the observed data and the origin of the cosmic rays. On the other hand, a large 10% single transverse-spin asymmetry in neutron production from transversely polarized proton collisions was found at the RHIC collider at BNL. It has provided a valuable input for understanding particle production processes in the polarized proton collisions. We will have a new collider experiment at RHIC which has a high resolution and a wide coverage of transverse momentum measurements in order to figure out elementary processes of the air shower generation.

scholarly journals QED ⊗ QCD THRESHOLD CORRECTIONS AT THE LHC

2004 ◽  
Vol 19 (28) ◽  
pp. 2113-2119 ◽  
Author(s):  
C. GLOSSER ◽  
S. JADACH ◽  
B. F. L. WARD ◽  
S. A. YOST
Keyword(s):  
Particle Production ◽  
Heavy Particle ◽  
Threshold Effects

We use the theory of YFS resummation to compute the size of the expected resummed soft radiative threshold effects in precision studies of heavy particle production at the LHC, where accuracies of 1% are desired in some processes. We find that the soft QED threshold effects are at the level of 0.3% whereas the soft QCD threshold effects enter at the level of 20% and hence both must be controlled to be on the conservative side to achieve such goals.

scholarly journals Heavy particle production in high-energy hadron collisions

1986 ◽  
Vol 263 (1) ◽  
pp. 37-60 ◽  
Author(s):  
John C. Collins ◽  
Davison E. Soper ◽  
George Sterman
Keyword(s):  
Particle Production ◽  
Heavy Particle ◽  
High Energy ◽  
Energy Hadron
Sign in / Sign up

Export Citation Format

Share Document