scholarly journals NRQCD: Fundamentals and Applications to Quarkonium Decay and Production

2006 ◽  
Vol 21 (04) ◽  
pp. 785-792 ◽  
Author(s):  
Geoffrey T. Bodwin
Keyword(s):  
Current Status ◽  
Experimental Measurements ◽  
Factorization Formalism ◽  
Quarkonium Production

I discuss NRQCD and, in particular, the NRQCD factorization formalism for quarkonium production and decay. I also summarize the current status of the comparison between the predictions of NRQCD factorization and experimental measurements.

scholarly journals DOUBLE PARTON FRAGMENTATION FUNCTION AND ITS EVOLUTION IN QUARKONIUM PRODUCTION

2014 ◽  
Vol 25 ◽  
pp. 1460040
Author(s):  
ZHONG-BO KANG
Keyword(s):  
Fragmentation Function ◽  
Evolution Equations ◽  
Heavy Quarkonia ◽  
Large Transverse Momentum ◽  
Heavy Quark Mass ◽  
Qcd Factorization ◽  
Factorization Formalism ◽  
Quarkonium Production ◽  
Large Enhancement ◽  
Fragmentation Functions

We summarize the results of a recent study on a new perturbative QCD factorization formalism for the production of heavy quarkonia of large transverse momentum pT at collider energies. Such a new factorization formalism includes both the leading power (LP) and next-to-leading power (NLP) contributions to the cross section in the [Formula: see text] expansion for heavy quark mass mQ. For the NLP contribution, the so-called double parton fragmentation functions are involved, whose evolution equations have been derived. We estimate fragmentation functions in the non-relativistic QCD formalism, and found that their contribution reproduce the bulk of the large enhancement found in explicit NLO calculations in the color singlet model. Heavy quarkonia produced from NLP channels prefer longitudinal polarization, in contrast to the single parton fragmentation function. This might shed some light on the heavy quarkonium polarization puzzle.

scholarly journals FUSION INDUCED BY RADIOACTIVE ION BEAMS

2005 ◽  
Vol 14 (08) ◽  
pp. 1121-1150 ◽  
Author(s):  
J. F. LIANG ◽  
C. SIGNORINI
Keyword(s):  
Ion Beams ◽  
Heavy Elements ◽  
Current Status ◽  
Radioactive Ion Beams ◽  
Experimental Measurements ◽  
Radioactive Beams ◽  
Unstable Nuclei ◽  
New Frontier ◽  
Fusion Yield ◽  
The Continuum

The use of radioactive beams opens a new frontier for fusion studies. The coupling to the continuum can be explored with very loosely bound nuclei. Experiments were performed with beams of nuclei at or near the proton and neutron drip-lines to measure fusion and associated reactions in the vicinity of the Coulomb barrier. In addition, the fusion yield is predicted to be enhanced in reactions involving very neutron-rich unstable nuclei. Experimental measurements were carried out to investigate if it is feasible to use such beams to produce new heavy elements. The current status of these experimental activities is given in this review.

scholarly journals B PHYSICS ON THE LATTICE: PRESENT AND FUTURE

2006 ◽  
Vol 21 (15) ◽  
pp. 1167-1182 ◽  
Author(s):  
MATTHEW WINGATE
Keyword(s):  
Lattice Qcd ◽  
Light Quark ◽  
Mass Difference ◽  
Current Status ◽  
Recent Measurement ◽  
Experimental Measurements ◽  
Decay Channels ◽  
Flavor Changing ◽  
Lattice Calculations ◽  
Light Quark Mass

Recent experimental measurements and lattice QCD calculations are now reaching the precision (and accuracy) needed to over-constrain the CKM parameters [Formula: see text] and [Formula: see text]. In this brief review, we discuss the current status of lattice QCD calculations needed to connect the experimental measurements of B meson properties to quark flavor-changing parameters. Special attention is given to B→πℓν, which is becoming a competitive way to determine |Vub|, and to [Formula: see text] mixings, which now include reliable extrapolation to the physical light quark mass. The combination of the recent measurement of the Bs mass difference and current lattice calculations dramatically reduces the uncertainty in |Vtd|. We present an outlook for reducing dominant lattice QCD uncertainties entering CKM fits and remark on lattice calculations for other decay channels.

scholarly journals J/ψ, ψ′ AND ϒ PRODUCTION AT HADRON COLLIDERS: A REVIEW

2006 ◽  
Vol 21 (19n20) ◽  
pp. 3857-3915 ◽  
Author(s):  
JEAN-PHILIPPE LANSBERG
Keyword(s):  
Experimental Data ◽  
Present Status ◽  
High Energy ◽  
Experimental Measurements ◽  
Color Singlet ◽  
Hadron Colliders ◽  
Direct Production ◽  
Quarkonium Production ◽  
Energy Hadron ◽  
Hadron Duality

We give an overview of the present status of knowledge of the production of J/ψ, ψ′ and ϒ in high-energy hadron collisions. We first present two early models, namely the Color-Singlet Model (CSM) and the Color-Evaporation Model (CEM). The first is the natural application of pQCD to quarkonium production and has been shown to fail dramatically to describe experimental data, the second is its phenomenological counterpart and was introduced in the spirit of the quark–hadron duality in the late 1970's. Then, we expose the most recent experimental measurements of J/ψ, ψ′ and ϒ prompt and direct production at nonzero pTfrom two high-energy hadron colliders, the Tevatron and RHIC. In a third part, we review six contemporary models describing J/ψ, ψ′ and ϒ production at nonzero pT.

scholarly journals An experimentalist’s guide to the semileptonic bottom to charm branching fractions

2018 ◽  
Vol 33 (32) ◽  
pp. 1850176 ◽  
Author(s):  
Matthew Rudolph
Keyword(s):  
Branching Fraction ◽  
Branching Fractions ◽  
Current Status ◽  
Experimental Measurements ◽  
Final States

This work summarizes the current status of the measured semileptonic branching fractions [Formula: see text]. The sum of exclusive measurements is compared with the inclusive determination, accounting for isospin extrapolation. Further derived quantities are computed, taking into account different explanations for the unmeasured components of the total branching fraction. These quantities focus on the charge breakdown of the final states, and are designed for use as inputs or comparisons in future experimental measurements.

scholarly journals MEASUREMENT OF CP-VIOLATION IN $D^0/\bar{D}^0$

2012 ◽  
Vol 27 (36) ◽  
pp. 1230039
Author(s):  
MICHAEL J. MORELLO
Keyword(s):  
Cp Violation ◽  
Particle Physics ◽  
New Physics ◽  
Charm Physics ◽  
Current Status ◽  
Experimental Measurements ◽  
Flavor Oscillations ◽  
The Past

Charm physics has played all along a central role in particle physics, however, the level of attention on it has tremendously increased in the last years because of the observation of "fast" [Formula: see text] flavor oscillations and because of very recent observed hints of CP-violation. While in the past these would have been unambiguously interpreted as signs of New Physics (NP), the revisitation of theoretical expectations, prompted by the latest experimental measurements, makes the picture not clear. This brief review covers the current status of CP-violating measurements in the [Formula: see text] system, both on the experimental and theoretical sides.

Current status of special planetary and lunar theories and ephemerides

1966 ◽  
Vol 25 ◽  
pp. 266-267
Author(s):  
R. L. Duncombe
Keyword(s):  
Observational Data ◽  
Current Status ◽  
Numerical Errors

An examination of some specialized lunar and planetary ephemerides has revealed inconsistencies in the adopted planetary masses, the presence of non-gravitational terms, and some outright numerical errors. They should be considered of temporary usefulness only, subject to subsequent amendment as required for the interpretation of observational data.

Current Status of Solid-State X-Ray Systems

1985 ◽  
Vol 43 ◽  
pp. 158-161
Author(s):  
Martin Peckerar ◽  
Anastasios Tousimis
Keyword(s):  
Solid State ◽  
Electric Fields ◽  
Spectral Lines ◽  
Current Status ◽  
Mobile Charge ◽  
Electron Hole ◽  
X Ray ◽  
Sensing Systems ◽  
Transmission Electron ◽  
Electron Microscopes

Solid state x-ray sensing systems have been used for many years in conjunction with scanning and transmission electron microscopes. Such systems conveniently provide users with elemental area maps and quantitative chemical analyses of samples. Improvements on these tools are currently sought in the following areas: sensitivity at longer and shorter x-ray wavelengths and minimization of noise-broadening of spectral lines. In this paper, we review basic limitations and recent advances in each of these areas. Throughout the review, we emphasize the systems nature of the problem. That is. limitations exist not only in the sensor elements but also in the preamplifier/amplifier chain and in the interfaces between these components.Solid state x-ray sensors usually function by way of incident photons creating electron-hole pairs in semiconductor material. This radiation-produced mobile charge is swept into external circuitry by electric fields in the semiconductor bulk.

Electron-deficient boron-based catalysts for C–H bond functionalisation

2021 ◽  
Author(s):  
Yuanhong Ma ◽  
Shao-Jie Lou ◽  
Zhaomin Hou
Keyword(s):  
Review Article ◽  
Current Status ◽  
Comprehensive Overview

This review article provides a comprehensive overview to recognise the current status of electron-deficient boron-based catalysis in C–H functionalisations.

Sign in / Sign up

Export Citation Format

Share Document