2017 Vol. 41, No. 8

Particles and fields
Analytic forms for cross sections of di-lepton production from e+e- collisions around the J/ψ resonance
Xing-Yu Zhou, Ya-Di Wang, Li-Gang Xia
2017, 41(8): 083001. doi: 10.1088/1674-1137/41/8/083001
Abstract:
A detailed theoretical derivation of the cross sections of e+e-→e+e- and e+e-→μ+μ- around the J/ψ resonance is reported. The resonance and interference parts of the cross sections, related to J/ψ resonance parameters, are calculated. Higher-order cor...
Analysis of λbλ l+l- rare decays in a non-universal Z' model
D. Banerjee, S. Sahoo
2017, 41(8): 083101. doi: 10.1088/1674-1137/41/8/083101
Abstract:
We investigate the rare baryonic λbλl+l- decays in a non-universal Z' model, which is one of the well-motivated extensions of the standard model (SM). Considering the effects of Z'-mediated flavour-changing neutral currents (FCNCs) we analyse the di...
Instanton effects on the heavy-quark static potential
U. T. Yakhshiev, Hyun-Chul Kim, B. Turimov, M. M. Musakhanov, Emiko Hiyama
2017, 41(8): 083102. doi: 10.1088/1674-1137/41/8/083102
Abstract:
We investigate instanton effects on the heavy-quark potential, including its spin-dependent part, based on the instanton liquid model. Starting with the central potential derived from the instanton vacuum, we obtain the spin-dependent part of the hea...
Analysis of the Y (4220) and Y (4390) as molecular states with QCD sum rules
Zhi-Gang Wang
2017, 41(8): 083103. doi: 10.1088/1674-1137/41/8/083103
Abstract:
In this article, we assign the m Y(4390) and m Y(4220) to be the vector molecular states DD1(2420) and D*D0*(2400), respectively, and study their masses and pole residues in detail with the QCD sum rules. The present calculations only favor assigning...
Analysis of the strong coupling form factors of bNB andcND in QCD sum rules
Guo-Liang Yu, Zhi-Gang Wang, Zhen-Yu Li
2017, 41(8): 083104. doi: 10.1088/1674-1137/41/8/083104
Abstract:
In this article, we study the strong interaction of the vertices bNB and cND using the three-point QCD sum rules under two different Dirac structures. Considering the contributions of the vacuum condensates up to dimension 5 in the operation produc...
S-wave resonance contributions to B(s)0→ηc(2S+π-in the perturbative QCD factorization approach
Ai-Jun Ma, Ya Li, Wen-Fei Wang, Zhen-Jun Xiao
2017, 41(8): 083105. doi: 10.1088/1674-1137/41/8/083105
Abstract:
By employing the perturbative QCD (PQCD) factorization approach, we study the quasi-two-body B(s)0→ ηc(2S+π- decays, where the pion pair comes from the S-wave resonance f0(X). The Breit-Wigner formula for the f0(500) and f0(1500) resonances and the...
Exotic hadron bound state production at hadron colliders
Yi Jin, Shi-Yuan Li, Yan-Rui Liu, Lu Meng, Zong-Guo Si, Xiao-Feng Zhang
2017, 41(8): 083106. doi: 10.1088/1674-1137/41/8/083106
Abstract:
The non-relativistic wave function framework is applied to study the production and decay of exotic hadrons, which can be effectively described as bound states of other hadrons. Employing the factorized formulation, with the help of event generators,...
Study of radially excited Ds(21S0) and Ds(3P)
Yu Tian, Ze Zhao, Ai-Lin Zhang
2017, 41(8): 083107. doi: 10.1088/1674-1137/41/8/083107
Abstract:
The unobserved JP=0- radial excitation Ds(21S0) is anticipated to have mass 2650 MeV (denoted as Ds(2650)). Study of hadronic production is an important way to identify highly excited states. We study hadronic production of Ds(2650) from higher excit...
Nuclear physics
Ω and φ in Au+Au collisions at sqrt(SNN)=200 and 11.5 GeV from a multiphase transport model
Y. J. Ye, J. H. Chen, Y. G. Ma, S. Zhang, C. Zhong
2017, 41(8): 084101. doi: 10.1088/1674-1137/41/8/084101
Abstract:
Within the framework of a multiphase transport model, we study the production and properties of Ω and φ in Au + Au collisions with a new set of parameters for √sNN=200 GeV and with the original set of parameters for √sNN=11.5 GeV. The AMPT model with...
Pion transverse-momentum spectrum, elliptic flow, and Hanbury-Brown-Twiss interferometry in a viscous granular source model
Jing Yang, Wei-Ning Zhang, Yan-Yu Ren
2017, 41(8): 084102. doi: 10.1088/1674-1137/41/8/084102
Abstract:
We examine the evolution of quark-gluon plasma (QGP) droplets with viscous hydrodynamics and analyze the pion transverse-momentum spectrum, elliptic flow, and Hanbury-Brown-Twiss (HBT) interferometry in a granular source model consisting of viscous Q...
Properties of even 168-178Hf isotopes using IBM-1 and SEF
Mushtaq Abed Al-Jubbori, Khalaf Ajaj Al-Mtiuty, Khaliel. I. Saeed, Fadhil I. Sharrad
2017, 41(8): 084103. doi: 10.1088/1674-1137/41/8/084103
Abstract:
The properties of the ground and excited-state (γ-and β-bands) of 168-178Hf nuclei have been studied. The ratio r(I+2/I) and Eγ (I→ I-2)/I have been calculated as a function of the spin (I) to determine the ground-state evolution. The results indicat...
Systematic study of kinematic and dynamic moments of inertia of superdeformed bands with Np Nn scheme
Honey Sharma, Neha Sharma, H. M. Mittal
2017, 41(8): 084104. doi: 10.1088/1674-1137/41/8/084104
Abstract:
The systematics of kinematic moment of inertia J(1) and dynamic moment of inertia J(2) of superdeformed (SD) bands in A~130, 150, 190 mass regions have been studied. We have obtained the values of J(1) and J(2) for all the SD bands observed in the A~...
Shell-model calculations for the semi-magic nucleus 85Br and systematic features of the N=50 odd-A isotones
Rui-Ju Guo, Zhi-Quan Li, Chen Liu, Yong-He Tian, Shou-Yu Wang
2017, 41(8): 084105. doi: 10.1088/1674-1137/41/8/084105
Abstract:
Level structures of 85Br have been investigated using the shell-model code nushellx within a large model space containing the neutron-core excitations across the N=50 closed shell. The calculated results have been compared with the available experime...
Particle and Nuclear Astrophysics and Cosmology
Higher order corrections to asymptotic-de Sitter inflation
M. Mohsenzadeh, E. Yusofi
2017, 41(8): 085101. doi: 10.1088/1674-1137/41/8/085101
Abstract:
Since trans-Planckian considerations can be associated with the re-definition of the initial vacuum, we investigate further the influence of trans-Planckian physics on the spectra produced by the initial quasi-de Sitter (dS) state during inflation. W...
Detectors, Related Electronics and Experimental Methods
Geometry optimization of a barrel silicon pixelated tracker
Qing-Yuan Liu, Meng Wang, Marc Winter
2017, 41(8): 086001. doi: 10.1088/1674-1137/41/8/086001
Abstract:
We have studied optimization of the design of a barrel-shaped pixelated tracker for given spatial boundaries. The optimization includes choice of number of layers and layer spacing. Focusing on tracking performance only, momentum resolution is chosen...
Accelerators
Focusing properties of discrete RF quadrupoles
Zhi-Hui Li, Zhi-Jun Wang
2017, 41(8): 087001. doi: 10.1088/1674-1137/41/8/087001
Abstract:
The particle motion equation for a Radio Frequency (RF) quadrupole is derived. The motion equation shows that the general transform matrix of a RF quadrupole with length less than or equal to 0.5β λ (β is the relativistic velocity of particles and λ ...
Analysis and correction of linear optics errors, and operational improvements in the Indus-2 storage ring
Riyasat Husain, A. D. Ghodke
2017, 41(8): 087002. doi: 10.1088/1674-1137/41/8/087002
Abstract:
Estimation and correction of the optics errors in an operational storage ring is always vital to achieve the design performance. To achieve this task, the most suitable and widely used technique, called linear optics from closed orbit (LOCO) is used ...
Design and experimental testing of a gas cluster ion accelerator
Xiao-Mei Zeng, Vasiliy Pelenovich Chuan-Sheng Liu, De-Jun Fu
2017, 41(8): 087003. doi: 10.1088/1674-1137/41/8/087003
Abstract:
A gas cluster ion beam (GCIB) system with cluster energy up to 12 keV has been designed. To facilitate pumping of the nozzle chamber and increased pressure of the gas source up to 10 atm, pulse mode was used for the gas feeding. Argon was employed as...

ISSN 1674-1137 CN 11-5641/O4

Original research articles, Ietters and reviews Covering theory and experiments in the fieids of

  • Particle physics
  • Nuclear physics
  • Particle and nuclear astrophysics
  • Cosmology
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