Theoretical predictions for Bhabha scattering observables are presented including complete one-loop electroweak radiative corrections. Longitudinal polarization of the initial beams is taken into ...account. Numerical results for the asymmetry ALR and the relative correction δ are given for the set of future e+e− collider energies Ecm=250, 500, 1000 GeV with various polarization degrees.
Diagnostic triage is an essential guideline recommendation for low back pain (LBP), which is the most frequent musculoskeletal condition that general practitioners encounter in Australia. Clinical ...diagnosis of LBP - informed by a focused history and clinical examination - is the key initial step for GPs, and determines subsequent diagnostic workup and allied health and medical specialist referral. The goal of diagnostic triage of LBP is to exclude non-spinal causes and to allocate patients to one of three broad categories: specific spinal pathology (< 1% of cases), radicular syndrome (∼ 5-10% of cases) or non-specific LBP (NSLBP), which represents 90-95% of cases and is diagnosed by exclusion of the first two categories. For specific spinal pathologies (eg, vertebral fracture, malignancy, infection, axial spondyloarthritis or cauda equina syndrome), a clinical assessment may reveal the key alerting features. For radicular syndrome, clinical features distinguish three subsets of nerve root involvement: radicular pain, radiculopathy and spinal stenosis. Differential diagnosis of back-related leg pain is complex and clinical manifestations are highly variable. However, distinctive clusters of characteristic history cues and positive clinical examination signs, particularly from neurological examination, guide differential diagnosis within this triage category. A diagnosis of NSLBP presumes exclusion of specific pathologies and nerve root involvement. A biopsychosocial model of care underpins NSLBP; this includes managing pain intensity and considering risk for disability, which directs matched pathways of care. Back pain is a symptom and not a diagnosis. Careful diagnostic differentiation is required and, in primary care, diagnostic triage of LBP is the anchor for a diagnosis.
Radiative corrections to the neutral current Drell–Yan-like processes are considered. Complete one-loop electroweak corrections are calculated within the SANC system. Theoretical uncertainties are ...discussed. Numerical results are presented for typical conditions of LHC experiments.
New features of the MCSANC v.1.20 program, a Monte Carlo tool for calculation of the next-to-leading order electroweak and QCD corrections to various Standard Model processes, have been presented. ...The extensions concern implementation of Drell–Yan-like processes and include a systematic treatment of the photon-induced contribution in proton–proton collisions and electroweak corrections beyond the NLO approximation. There are also technical improvements such as calculation of the forward–backward asymmetry for the neutral current Drell–Yan process. The updated code is suitable for studies of the effects due to EW and QCD radiative corrections to Drell–Yan (and several other) processes at the LHC and for forthcoming high-energy proton–proton colliders.
Modules and packages for the one-loop calculations at the partonic level represent the first level of SANC output computer product. The next level represents Monte Carlo integrator
mcsanc
, realizing ...fully differential hadron level calculations (convolution with PDF) for the HEP processes at LHC. In this paper we describe the implementation into the framework mcsanc first set of processes: DY NC, DY CC,
and single top production. Both EW and QCD NLO corrections are taken into account. A comparison of SANC results with those existing in the world literature is given.
Radiative corrections to the charged current Drell–Yan processes are revisited. Complete one-loop electroweak corrections are calculated within the automatic SANC system. Electroweak scheme ...dependence and the choice of the factorization scale are discussed. Comparisons with earlier calculations are presented.
The SANC system is used for systematic calculations of various processes within the Standard Model in the one-loop approximation. QED, electroweak, and QCD corrections are computed to a number of ...processes being of interest for modern and future high-energy experiments. Several applications for the LHC physics program are presented. Development of the system and the general problems and perspectives for future improvement of the theoretical precision are discussed.
In this article we have summarized the status of the system
SANC version
1.00. We have implemented theoretical predictions for many high energy interactions of fundamental particles at the one-loop ...precision level for up to 4-particle processes. In the present part of our
SANC description we place emphasis on an extensive discussion of an important first step of calculations of the one-loop amplitudes of 3- and 4-particle processes in QED, QCD and EW theories.
Title of program:
SANC
Catalogue identifier: ADXK_v1_0
Program summary URL:
http://cpc.cs.qub.ac.uk/summaries/ADXK_v1_0
Program obtainable from: CPC Program Library, Queen's University of Belfast, N. Ireland
Designed for: platforms on which Java and FORM3 are available
Tested on: Intel-based PC's
Operating systems: Linux, Windows
Programming languages used: Java, FORM3, PERL, FORTRAN
Memory required to execute with typical data: 10 Mb
No. of bytes in distributed program, including test data, etc.: 3 658 844
No. of bits in a word: 32
No. of processors used: 1 on
SANC server, 1 on
SANC client
Distribution format: tar.gz
Nature of physical problem: Automatic calculation of pseudo- and realistic observables for various processes and decays in the Standard Model of Electroweak interactions, QCD and QED at one-loop precision level. Form factors and helicity amplitudes free of UV divergences are produced. For exclusion of IR singularities the soft photon emission is included.
Method of solution: Numerical computation of analytical formulae of form factors and helicity amplitudes. For simulation of two fermion radiative decays of Standard Model bosons
(
W
±
,
Z
)
and the Higgs boson a Monte Carlo technique is used.
Restrictions on the complexity: In the current version of
SANC there are 3 and 4 particle processes and decays available at one-loop precision level.
Typical running time: The running time depends on the selected process. For instance, the symbolic calculation of form factors (with precomputed building blocks) of Bhabha scattering in the Standard Model takes about 15 s, helicity amplitudes—about 30 s, and bremsstrahlung—10 s. The numerical computation of cross-section for this process takes about 5 s (CPU 3 GHz IP4, RAM 512 Mb, L2 1024 KB).
SANC: the process γγ → ΖΖ Bardin, D.; Bondarenko, S.; Christova, P. ...
Physics of particles and nuclei letters,
11/2017, Letnik:
14, Številka:
6
Journal Article
Recenzirano
Odprti dostop
The implementation of the process γγ →
ΖΖ
at the one-loop level within SANC system multichannel approach is considered. The derived one-loop scalar form factors can be used for any cross channel ...after an appropriate permutation of their arguments–Mandelstam variables
s
,
t
,
u
. To check of the correctness of the results we observe the independence of the scalar form factors on the gauge parameters and the validity of Ward identity (external photon transversality). We present the complete analytical results for the covariant and tensor structures and helicity amplitudes for this process. We make an extensive comparison of our analytical and numerical results with those existing in the literature.
PDF
