scholarly journals Single inclusive particle production in proton-nucleus collisions at next-to-leading order in the hybrid formalism

2015 ◽  
Vol 91 (9) ◽  
Author(s):  
Tolga Altinoluk ◽  
Néstor Armesto ◽  
Guillaume Beuf ◽  
Alex Kovner ◽  
Michael Lublinsky
Keyword(s):  
Particle Production ◽  
Leading Order

scholarly journals Forward particle production in proton-nucleus collisions at next-to-leading order

2018 ◽  
Vol 192 ◽  
pp. 00014
Author(s):  
D.N. Triantafyllopoulos
Keyword(s):  
Cross Section ◽  
Particle Production ◽  
Eikonal Approximation ◽  
High Energy ◽  
Fine Tuning ◽  
Color Glass ◽  
Leading Order ◽  
Energy Evolution ◽  
The Impact ◽  
Correct Size

We consider the next-to-leading order (NLO) calculation of single inclusive particle production at forward rapidities in proton-nucleus collisions and in the framework of the Color Glass Condensate (CGC). We focus on the quark channel and the corrections associated with the impact factor. In the first step of the evolution the kinematics of the emitted gluon is kept exactly (and not in the eikonal approximation), but such a treatment which includes NLO corrections is not explicitly separated from the high energy evolution. Thus, in this newly established “factorization scheme”, there is no “rapidity subtraction”. The latter suffers from fine tuning issues and eventually leads to an unphysical (negative) cross section. On the contrary, our reorganization of the perturbation theory leads by definition to a well-defined cross section and the numerical evaluation of the NLO correction is shown to have the correct size.

Single particle inclusive leptoproduction in quantum chromodynamics

1982 ◽  
Vol 60 (7) ◽  
pp. 939-949 ◽  
Author(s):  
Bruce A. Campbell
Keyword(s):  
Quantum Chromodynamics ◽  
Single Particle ◽  
Particle Production ◽  
Neutral Current ◽  
Asymptotic Freedom ◽  
Charged Current ◽  
Leading Order ◽  
Production Processes ◽  
Scaling Violations

The effects of scaling violations in current induced single particle inclusive lepto-production reactions is examined in the framework of asymptotic freedom. A set of quark fragmention functions is introduced which approximately satisfies the leading order asymptotic freedom constraints of quantum chromodynamics. These are then used to give a consistent leading order treatment of current induced single particle production processes, in particular: e+e− annihilation, charged current neutrino (antineutrino) reactions, electro (muo) production, and neutral current neutrino reactions. We emphasize the consistency of the different reactions with an asymptotically free parton picture.

scholarly journals Particle production in pA collisions beyond leading order

2017 ◽  
Vol 967 ◽  
pp. 297-300
Author(s):  
E. Iancu ◽  
A.H. Mueller ◽  
D.N. Triantafyllopoulos
Keyword(s):  
Particle Production ◽  
Leading Order

scholarly journals DeepXS: fast approximation of MSSM electroweak cross sections at NLO

2020 ◽  
Vol 80 (1) ◽  
Author(s):  
Sydney Otten ◽  
Krzysztof Rolbiecki ◽  
Sascha Caron ◽  
Jong-Soo Kim ◽  
Roberto Ruiz de Austri ◽  
...  
Keyword(s):  
Cross Sections ◽  
Particle Production ◽  
Production Cross ◽  
Hadron Collider ◽  
Distribution Functions ◽  
Monte Carlo Integration ◽  
Leading Order ◽  
Parton Distribution Functions ◽  
Dimensional Parameter ◽  
O 10

AbstractWe present a deep learning solution to the prediction of particle production cross sections over a complicated, high-dimensional parameter space. We demonstrate the applicability by providing state-of-the-art predictions for the production of charginos and neutralinos at the Large Hadron Collider (LHC) at the next-to-leading order in the phenomenological MSSM-19 and explicitly demonstrate the performance for $$pp\rightarrow \tilde{\chi }^+_1\tilde{\chi }^-_1,$$pp→χ~1+χ~1-,$$\tilde{\chi }^0_2\tilde{\chi }^0_2$$χ~20χ~20 and $$\tilde{\chi }^0_2\tilde{\chi }^\pm _1$$χ~20χ~1± as a proof of concept which will be extended to all SUSY electroweak pairs. We obtain errors that are lower than the uncertainty from scale and parton distribution functions with mean absolute percentage errors of well below $$0.5\,\%$$0.5% allowing a safe inference at the next-to-leading order with inference times that improve the Monte Carlo integration procedures that have been available so far by a factor of $$\mathscr {O}(10^7)$$O(107) from $$\mathscr {O}(\mathrm{min})$$O(min) to $$\mathscr {O}(\mu \mathrm{s})$$O(μs) per evaluation.

QCD at Fixed Order: Technology

2018 ◽  
Author(s):  
John Campbell ◽  
Joey Huston ◽  
Frank Krauss
Keyword(s):  
Particle Production ◽  
W Boson ◽  
Hadron Production ◽  
Tree Level ◽  
Leading Order ◽  
Short Summary ◽  
Electron Positron Annihilation ◽  
Electron Positron ◽  
Fixed Order ◽  
Infrared Divergences

This chapter is devoted to the technology of fixed-order calculations, in particular, in QCD. After a short summary of methods for the efficient evaluation of tree-level scattering amplitudes for multi-particle production, and their integration in phase space, next-to leading order corrections in QCD are addressed. Techniques for the evaluation of loop amplitudes with modern methods, based on the reduction to master integrals, either analytically or with numerical unitarity cut methods, are discussed in some detail. After identifying the problem of infrared divergences and illuminating their treatment with a toy model, Catani-Seymour subtraction is explicitly introduced and exemplified for two cases, namely inclusive hadron production in electron-positron annihilation and inclusive W boson production in hadron collisions. This chapter concludes with some remarks concerning the rapidly developing field of next-to-next-to leading order calculations.

Intramitochondrial Viruses of Reptilian Cell Origin

1972 ◽  
Vol 30 ◽  
pp. 318-319
Author(s):  
Philip D. Lunger ◽  
H. Fred Clark
Keyword(s):  
Particle Production ◽  
Outer Zone ◽  
Density Variation ◽  
Core Region ◽  
Mitochondrial Membranes ◽  
Virus Particles ◽  
The Core ◽  
Vipera Russelli ◽  
Maturation Stages ◽  
Type Particle

In the course of fine structure studies of spontaneous “C-type” particle production in a viper (Vipera russelli) spleen cell line, designated VSW, virus particles were frequently observed within mitochondria. The latter were usually enlarged or swollen, compared to virus-free mitochondria, and displayed a considerable degree of cristae disorganization.Intramitochondrial viruses measure 90 to 100 mμ in diameter, and consist of a nucleoid or core region of varying density and measuring approximately 45 mμ in diameter. Nucleoid density variation is presumed to reflect varying degrees of condensation, and hence maturation stages. The core region is surrounded by a less-dense outer zone presumably representing viral capsid.Particles are usually situated in peripheral regions of the mitochondrion. In most instances they appear to be lodged between loosely apposed inner and outer mitochondrial membranes.

Electrospray technique for solid lipid-based particle production

2009 ◽  
Vol 00 (00) ◽  
pp. 090930024652050-8
Author(s):  
M. Trotta ◽  
R. Cavalli ◽  
C. Trotta ◽  
R. Bussano ◽  
L. Costa
Keyword(s):  
Particle Production ◽  
Solid Lipid
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