We present a program to calculate the total cross section for top-quark pair production in hadronic collisions. The program takes into account recent theoretical developments such as approximate ...next-to-next-to-leading order perturbative QCD corrections and it allows for studies of the theoretical uncertainty by separate variations of the factorization and renormalization scales. In addition it offers the possibility to obtain the cross section as a function of the running top-quark mass. The program can also be applied to a hypothetical fourth quark family provided the QCD couplings are standard.
Program title: Hathor
Catalogue identifier: AEID_v1_0
Program summary URL:
http://cpc.cs.qub.ac.uk/summaries/AEID_v1_0.html
Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland
Licensing provisions: GNU GPL 3
No. of lines in distributed program, including test data, etc.: 5405
No. of bytes in distributed program, including test data, etc.: 327 718
Distribution format: tar.gz
Programming language: C++, Fortran, Java
Computer: Standard PCs (x86, x86_64 processors)
Operating system: Linux
RAM: 256 MB
Classification: 11.1
External routines: Interface to LHAPDF for the user's choice of parton distribution functions, see
http://projects.hepforge.org/lhapdf/
Nature of problem: Computation of total cross section in perturbative QCD.
Solution method: Numerical integration of hard parton cross section convoluted with parton distribution functions.
Running time: A few seconds to a few minutes on standard desktop PCs or notebooks, depending on the chosen options.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
Using the most general form of the interpolating current for baryons, the strong electric and magnetic coupling constants of light vector mesons
ρ
and
K
∗
with doubly heavy baryons are computed ...within the light-cone sum rules. We consider 2- and 3-particle distribution amplitudes of the aforementioned vector mesons. The obtained results can be useful in the analysis of experimental data on the properties of doubly heavy baryons conducted at LHC.
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Abstract
One of the promising areas of improvement of sensors for monitoring the condition of track sections is the development of controlling sensors, which are less dependent on changes in ballast ...resistance, longitudinal asymmetry and standard value of shunt sensitivity, such a direction is the development of adaptive track circuits 1-5. The article proposes a control sensor with an adaptive receiver, principle of operation of which is that monitoring the state of the track section depends on the parameters of adjacent monitoring sensors, included in the common controlled zone CZ.
Mathematical model and analytical expressions have been developed taking into account the resistance of the rails and the resistance of the insulation being carried out 6. Proposed the coefficients of a rail fourpole with one of the choke-transformer, powered with one side. The calculated expressions of the fourpole and the criteria for the sensitivity of the rail circuit when one line is broken are presented and derived, and also the minimum transmission resistance 6.
In this paper, we analyze the vertices of doubly heavy spin-3/2–spin-1/2 baryons with light mesons within the method of light-cone QCD sum rules. These vertices are parametrized in terms of one ...(three) coupling constant(s) for the pseudoscalar (vector) mesons. The said coupling constants are calculated for all possible transitions. The results presented here can serve as useful information in experimental as well as theoretical studies of the properties of doubly heavy baryons.
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We estimate the strong coupling constants of charmed and bottom mesons ... , D(s)1, ... , and B(s)1 with light vector mesons ρ,ω, K*, and ϕ within the framework of light-cone QCD sum rules. We take ...into account the contributions of two- and three-particle distribution amplitudes of light vector mesons of twist-2, -3, and -4, and determine the values of the couplings between heavy vector (axial vector) mesons and light vector mesons. These couplings can play an essential role in understanding the charmonium absorption cross section in quark-gluon plasma. Moreover, we compare our estimations to the ones predicted by other approaches.(ProQuest: … denotes formulae omitted.)
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We explore the recently observed Ξb(6227)− resonance to fix its quantum numbers. To this end, we consider various possible scenarios: It can be considered as either a 1P or 2S excitation of the Ξb− ...and Ξb′(5935) ground-state baryons with spin-12 or the 1P or 2S excitation of the ground-state Ξb(5955) with spin-32. We calculate the masses of the possible angular-orbital 1P and 2S excited states corresponding to each channel employing the QCD sum rule technique. It is seen that all the obtained masses are in agreement with the experimentally observed value, implying that the mass calculations are not enough to determine the quantum numbers of the state under question. Therefore, we extend the analysis to investigate the possible decays of the excited states into Λb0K− and Ξb−π. Using the light cone QCD sum rule method, we calculate the corresponding strong coupling constants, which are used to extract the decay widths of the modes under consideration. Our results on decay widths indicate that the Ξb(6227)− is a 1P angular-orbital excited state of the Ξb(5955) baryon with quantum numbers JP=32−.
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Very recently, Belle Collaboration reported observation of a narrow state called Ω(2012) with mass 2012.4±0.7(stat)±0.6(syst) MeV and width 6.4−2.0+2.5(stat)±1.6(syst) MeV. We calculate the mass ...and residue of the Ω(2012) state by employing the QCD sum rule method. Comparison of the obtained results with the experimental data allows us to interpret this state as a 1P orbital excitation of the ground state Ω baryon, i.e., with quantum numbers JP=32−.
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The radiative decays of the p-wave charmed heavy baryons to the ground state baryon states are studied in the framework of the light cone QCD sum rules method. Firstly, the transition form factors ...that describe these transitions are estimated and then, using these form factors, the corresponding decay widths are calculated. A comparison of our results for the decay widths with those predicted by the other approaches existing in the literature is performed.
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Radial excitations of the decuplet baryons Aliev, T. M.; Azizi, K.; Sundu, H.
European physical journal. C, Particles and fields,
04/2017, Volume:
77, Issue:
4
Journal Article
Peer reviewed
Open access
The ground and first excited states of the decuplet baryons are studied using the two-point QCD sum rule approach. The mass and residue of these states are computed and compared with the existing ...experimental data and other theoretical predictions. The results for the masses of the ground state particles as well as the excited
Δ
and
Σ
∗
states are in good consistency with experimental data. Our results on the excited
Ξ
∗
and
Ω
-
states reveal that the experimentally poorly known
Ξ
(
1950
)
and
Ω
-
(
2250
)
can be assigned to the first excited states in
Ξ
∗
and
Ω
-
channels, respectively.
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By using the quark part of the energy-momentum tensor current, the gravitational formfactors of the ρ, π, and K mesons are calculated within the light-cone sum rules method. In the considered ...version, the energy-momentum tensor current is not conserved and as a result, for integer spin J, there appear 4J + 2(2J + 1) formfactors, which correspond to the conservation (nonconservation) of the energy-momentum tensor current. The average mass radius of ρ, π, and K mesons as well as the gravitational quadrupole moment of the ρ meson are calculated. We also compare our results with the one existing in the literature on these quantities.
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