Rare Top-Quark Decay Slabospitsky, S. R.
Physics of atomic nuclei,
2023/12, Letnik:
86, Številka:
6
Journal Article
Recenzirano
The rare
-quark decay
is considered within the Standard Model, as well as with allowance for the charged Higgs boson contribution. The role of background processes is discussed.
We calculate the contribution of anomalous top-quark interaction with a gluon, photon, and
Z-boson (FCNC) to
t
t
̄
pair production in hadronic collisions. Using the current data from Run 1 of the ...Tevatron we evaluate the upper limit on the the anomalous coupling of
t-quark with gluon, |
κ
g
/
Λ|≤0.52 TeV
−1. We examine the production of double top (
tt or
t
̄
t
̄
) at hadronic colliders as a result of FCNC interactions of the top quark. It is shown that the study of such reactions at LHC collider makes it possible to obtain the constraint on strength of coupling at the level of |
κ
g
/
Λ|≤0.09 TeV
−1.
A standard file format is proposed to store process and event information, primarily output from parton-level event generators for further use by general-purpose ones. The information content is ...identical with what was already defined by the Les Houches Accord five years ago, but then in terms of Fortran commonblocks. This information is embedded in a minimal XML-style structure, for clarity and to simplify parsing.
Using the constraint on the single top production cross-section obtained at the HERA collider, σ(ep→etX), we evaluate an upper limit on coupling constant of the anomalous top quark interaction with a ...gluon via flavor-changing neutral current: |κtgq/Λ|≲0.4 TeV−1, BR(t→gq)<13%.
Physics at the Large Hadron Collider (LHC) and the International
e
+
e
-
Linear Collider (ILC) will be complementary in many respects, as has been demonstrated at previous generations of hadron and ...lepton colliders. This report addresses the possible interplay between the LHC and ILC in testing the Standard Model and in discovering and determining the origin of new physics. Mutual benefits for the physics programme at both machines can occur both at the level of a combined interpretation of Hadron Collider and Linear Collider data and at the level of combined analyses of the data, where results obtained at one machine can directly influence the way analyses are carried out at the other machine. Topics under study comprise the physics of weak and strong electroweak symmetry breaking, supersymmetric models, new gauge theories, models with extra dimensions, and electroweak and QCD precision physics. The status of the work that has been carried out within the LHC/ILC Study Group so far is summarized in this report. Possible topics for future studies are outlined.
This is the manual of the specialized event generator TopReX 3.25. The generator provides the simulation of several important processes in
pp and
p
p
̄
collisions, not implemented in PYTHIA (yet). ...Some of these processes include
t-quarks whose spin polarizations are taken into account in the subsequent decay of the
t-quarks. Several non-SM top quark decay channels are included, too. All calculated subprocesses can be accessed from PYTHIA as external processes. In addition, TopReX can be used as stand alone event generator, providing partonic final states before showering. In this mode the control of the event generation is taken by TopReX itself. A few simple examples of
main routines, which show how to use TopReX in the different modes are discussed.
The SPASCHARM experiment is aimed at a systematic study of the nucleon spin structure and the spin dependence of the strong interaction of antimatter and matter with matter at energies up to 45 GeV. ...As part of the first stage of the experiment, the study of the spin properties of hadrons will take place in a beam of negatively charged hadrons on existing beamline 14 at the operating SPASCHARM setup at the U70 facility. At the second stage, the production of polarized beams of protons and antiprotons is envisaged in beamline 24A of the U-70 accelerator facility. A polarized antiproton beam will certainly become a unique beam in the world. It is planned to measure single-spin asymmetries in dozens of reactions, both on hydrogen and on various nuclei. At the SPASCHARM facility, it is also possible to measure the transverse polarization of hyperons and elements of the spin density matrix of vector mesons. The spin structure of the nucleon will be investigated in the study of quarkonium production to determine the contribution of gluons to the proton spin. The presence of two types of polarized beams and eight types of nonpolarized beams (π
±
,
K
±
,
p
,
,
d
,
C
), in combination with a polarized target, expands the range of studies of polarization phenomena and enhances the uniqueness of the project.
The task of constantly improving the efficiency of justice continues to be relevant due to its versatility and the growing demand of society. In order to continue this discussion, the article ...analyzes the judicial system of Singapore through the prism of its judicial system and judicial proceedings. The purpose of the work is to analyze the practical solutions of the studied justice, to highlight the positive and negative experience. The scientific and practical significance of the study lies in the fact that there is a positive practice of increasing the level of accessibility and openness of justice. As a result, it seems possible to implement the norms of foreign law due to the proximity of the emerging needs of judicial systems, both in Russia and in Kazakhstan. Methodological basis: formal legal method, synchronous and diachronic methods, as well as general scientific methods of cognition. A brief overview of the Singapore justice system, including the experience of implementing electronic technologies in this system, is given. The author shows that the introduction of these technologies and reasonable deterimental some elements of the trial allows to reduce the bureaucratic and material costs, as well as more efficiently and safely in a pandemic 2020 use human resources of the court and other persons involved in the case. Keywords: electronic court, automation of legal proceedings, accessibility of justice, internet. References: 1 Alenov M.A., Implementation of e-justice in Kazakhstan: regulatory framework and prospects // KAZGUU University. – Astana: Law and State, 2013. No. 3 (60). S. 71-73. 2 Cornie Ng. Integrated Electronic Litigation System (iELS) for the Singapore Ludiciary. URL: http: // mstreamlegal.com/ uploads / upload_ legal_ research_ center / lntegrated% 20Litigation% 20system.pdf. 3 Zhuikov V., Borisova E., Golovko L., Bonner A., Yarkov V., Afanasyev S., Pashin S., Patsatsiya M., Tai Yu., Smolnikov D. Reform of the judicial system in Russia: a new stage // Zakon. – M .: Zakon, 2016, No. 11 S. 20-34. 4 Zorkin V.D. The letter and spirit of the Constitution // Rossiyskaya Gazeta. – M .: Rossiyskaya Gazeta, 2018. No. 7689 (226) // SPS ConsultantPlus. 5 In the Supreme Court of the Republic of Singapore Registrar’s Circular No. 3 of 2020 (Mar. 27, 2020) (Supreme Court Circular), https://perma.cc/K5CE-9YW4. 6 Legislation, CRT, https://perma.cc/2XMY-P6D8. 7 Malik, Walled Haider. Judiciary-Led Reforms in Singapore: framework, strategies and lessons. The World Bank, 2007. P. 53. 8 Media Release, Supreme Court, State Courts and Family Justice Courts to Hear Only Essential and Urgent Matters from 7 April to 4 May 2020 (Apr. 5, 2020), https://perma.cc/8WE5-RVQ4. 9 Message from Chief Justice Sundaresh Menon, The Singapore Judiciary’s Response to COVID-19 (Mar. 26, 2020), https:// perma.cc/WA7T-DBHN. 10 Momotov V.V. Justice and expediency in the Anglo-American and continental-European legal systems: problem statement // Russian justice. 2017.No. 12.P. 16-24. 11 Lim Seng Siew. The Role of Service Bureaux in EFS. URL: http: // www.lawgazette.com.sg/ 2000-2 / Feb00-20.htm. 12 Reshetnyak V.I. Information technologies in the judicial system of Singapore // Information law. 2012. N 2.P. 21 – 24 // SPS ConsultantPlus. 13 Rogov I. I. Reforming according to the principle of the rule of law // Legal newspaper. 2016. No. 130. 14 Singapore Judicial System, Supreme Court of Singapore (last updated June 7, 2019), https://perma.cc/Z2SX- UFCL. 15 Tan Siong Thye. Senior District Judge Subordinate Courts of Singapore. Current reforms in Asean countries – lessons and experiences. The Singapore’s experience. URL: http: // www.aseanlawassociation.org/ 10GAdocs /. URL: http:// app.supremecourt.gov.sg. 16 Walker J., Watson G.D. New Technologies and the Civil Litigation Process. Common Law General Report. Osgoode Hall Law School York University, Toronto (Canada) http: // research.osgoode.yorku.ca/ iapl2007. 17 Wong Peck. eJustice-Transforming The Justice System. URL: http:// www.aija.org.au/ Law&Tech%2008/ Papers/. 18 Woolf H.K. Access to justice – Final Report to the Lord Chancellor on the civil justice system in England and Wales. London, 1996 https://www.goodreads.com/book/show/1632182.Access_to_Justice.
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