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 Chinese Physics C   [SJR: 0.367]   [H-I: 12]   [0 followers]  Follow         Subscription journal    ISSN (Print) 1674-1137    Published by Institute of Physics (IOP)  [70 journals]
• Combined estimation for multi-measurements of branching ratio
• First page: 103001
Abstract: A maximum likelihood method is used to deal with the combined estimation of multi-measurements of a branching ratio, where each result can be presented as an upper limit. The joint likelihood function is constructed using observed spectra of all measurements and the combined estimate of the branching ratio is obtained by maximizing the joint likelihood function. The Bayesian credible interval or upper limit of the combined branching ratio, is given in cases both with and without inclusion of systematic error.
Citation: Chinese Physics C
PubDate: 2015-10-14T23:00:00Z
Issue No: Vol. 39, No. 10 (2015)

• NLO QCD corrections to η c +h c (1 P )/ψ 1,2 (1 D ) production
at B-factories
• Authors: Chen Long-Bin; Jiang Jun Qiao Cong-Feng
First page: 103101
Abstract: We calculate the next-to-leading order (NLO) quantum chromodynamics (QCD) corrections to double charmonium production processes e + e − → γ* → η c +h c (1 P )/ψ 1,2 (1 D ) within the non-relativistic QCD (NRQCD) factorization framework. We find that the corrections to η c +h c (1 P ) production are positive, while those to η c +ψ 1,2 (1 D ) are negative. Unlike the J/ψ+η c case, all the corrections here are not large. Uncertainties in the renormalization scale, quark mass and running energy of center-of-mass are discussed, and the scale dependence of these processes is found to be greatly reduced with the NLO QCD corrections.
Citation: Chinese Physics C
PubDate: 2015-10-14T23:00:00Z
Issue No: Vol. 39, No. 10 (2015)

• Holographic cusped Wilson loops in q -deformed AdS 5 × S 5 spacetime
• Authors: Bai Nan; Chen Hui-Huang Wu Jun-Bao
First page: 103102
Abstract: In this paper, a minimal surface in q -deformed AdS 5 × S 5 with a cusp boundary is studied in detail. This minimal surface is dual to a cusped Wilson loop in dual field theory. We find that the area of the minimal surface has both logarithmic squared divergence and logarithmic divergence. The logarithmic squared divergence cannot be removed by either Legendre transformation or the usual geometric subtraction. We further make an analytic continuation to the Minkowski signature, taking the limit such that the two edges of the cusp become light-like, and extract the anomalous dimension from the coefficient of the logarithmic divergence. This anomalous dimension goes back smoothly to the results in the undeformed case when we take the limit that the deformation parameter goes to zero.
Citation: Chinese Physics C
PubDate: 2015-10-14T23:00:00Z
Issue No: Vol. 39, No. 10 (2015)

• Direct mass measurements of neutron-rich 86 Kr projectile fragments and
the persistence of neutron magic number N =32 in Sc isotopes
• Authors: Xu Xing; Wang Meng, Zhang Yu-Hu, Xu Hu-Shan, Shuai Peng, Tu Xiao-Lin, Yuri A. Litvinov, Zhou Xiao-Hong, Sun Bao-Hua, Yuan You-Jin, Xia Jia-Wen, Yang Jian-Cheng, Klaus Blaum, Chen Rui-Jiu, Chen Xiang-Cheng, Fu Chao-Yi, Ge Zhuang, Hu Zheng-Guo, Huang Wen-Jia, Liu Da-Wei, Lam Yi-Hua, Ma Xin-Wen, Mao Rui-Shi, T. Uesaka, Xiao Guo-Qing, Xing Yuan-Ming, T. Yamaguchi, Y. Yamaguchi, Zeng Qi, Yan Xin-Liang, Zhao Hong-Wei, Zhao Tie-Cheng, Zhang Wei Zhan Wen-Long
First page: 104001
Abstract: In this paper, we present direct mass measurements of neutron-rich 86 Kr projectile fragments conducted at the HIRFL-CSR facility in Lanzhou by employing the Isochronous Mass Spectrometry (IMS) method. The new mass excesses of 52–54 Sc nuclides are determined to be −40492(82), −38928(114), −34654(540) keV, which show a significant increase of binding energy compared to the reported ones in the Atomic Mass Evaluation 2012 (AME12). In particular, 53 Sc and 54 Sc are more bound by 0.8 MeV and 1.0 MeV, respectively. The behavior of the two neutron separation energy with neutron numbers indicates a strong sub-shell closure at neutron number N =32 in Sc isotopes.
Citation: Chinese Physics C
PubDate: 2015-10-14T23:00:00Z
Issue No: Vol. 39, No. 10 (2015)

• Forward–backward emission of target evaporated fragments in high
energy nucleus–nucleus collisions
• Authors: Zhang Zhi; Ma Tian-Li Zhang Dong-Hai
First page: 104002
Abstract: The multiplicity distribution, multiplicity moment, scaled variance, entropy and reduced entropy of target evaporated fragments emitted in forward and backward hemispheres in 12 A GeV 4 He, 3.7 A GeV 16 O, 60 A GeV 16 O, 1.7 A GeV 84 Kr and 10.7 A GeV 197 Au -induced emulsion heavy target (AgBr) interactions are investigated. It is found that the multiplicity distribution of target evaporated fragments emitted in both forward and backward hemispheres can be fitted by a Gaussian distribution. The multiplicity moments of target evaporated particles emitted in the forward and backward hemispheres increase with the order of the moment q , and the second-order multiplicity moment is energy independent over the entire energy range for all the interactions in the forward and backward hemisphere. The scaled variance, a direct measure of multiplicity fluctuations, is close to one for all the interac...
Citation: Chinese Physics C
PubDate: 2015-10-14T23:00:00Z
Issue No: Vol. 39, No. 10 (2015)

• Fractal geometrical properties of nuclei
• Authors: Ma Wei-Hu; Wang Jian-Song, Wang Qi, S. Mukherjee, Yang Lei, Yang Yan-Yun Huang Mei-Rong
First page: 104101
Abstract: We present a new idea to understand the structure of nuclei and compare it to the liquid drop model. After discussing the probability that the nuclear system may be a fractal object with the characteristic of self-similarity, the irregular nuclear structure properties and the self-similarity characteristic are considered to be an intrinsic aspect of the nuclear structure properties. For the description of nuclear geometric properties, the nuclear fractal dimension is an irreplaceable variable similar to the nuclear radius. In order to determine these two variables, a new nuclear potential energy formula which is related to the fractal dimension is put forward and the phenomenological semiempirical Bethe–Weizsäcker binding energy formula is modified using the fractal geometric theory. One important equation set with two equations is obtained, which is related to the concept that the fractal dimension should be a dynamic parameter in the process of nuclear synthesis. The fractal di...
Citation: Chinese Physics C
PubDate: 2015-10-14T23:00:00Z
Issue No: Vol. 39, No. 10 (2015)

• Particle-number fluctuation of pairing correlations for Dy isotopes
• Authors: Cheng Ming-Jian; Liu Lang Zhang Yi-Xin
First page: 104102
Abstract: Within the relativistic mean field (RMF) theory, the ground state properties of dysprosium isotopes are studied using the shell-model-like approach (SLAP), in which pairing correlations are treated with particle-number conservation, and the Pauli blocking effects are taken into account exactly. For comparison, calculations of the Bardeen–Cooper–Schrieffer (BCS) model with the RMF are also performed. It is found that the RMF+SLAP calculation results, as well as the RMF+BCS ones, reproduce the experimental binding energies and one- and two-neutron separation energies quite well. However, the RMF+BCS calculations give larger pairing energies than those obtained by the RMF+SLAP calculations, in particular for nuclei near the proton and neutron drip lines. This deviation is discussed in terms of the BCS particle-number fluctuation, which leads to the sizable deviation of pairing energies between the RMF+BCS and RMF+SLAP models, where the fluctuation of the particle number is eliminate...
Citation: Chinese Physics C
PubDate: 2015-10-14T23:00:00Z
Issue No: Vol. 39, No. 10 (2015)

• Shape phase transition in the odd Sm nuclei: effective order parameter and
odd–even effect
• Authors: Zhang Yu; Guan Xin, Wang Yin, Zuo Yan, Bao Li-Na Pan Feng
First page: 104103
Abstract: Some binding energy related quantities serving as effective order parameters have been used to analyze the shape phase transition in the odd Sm nuclei. It is found that the signals of phase transition in the odd Sm nuclei are greatly enhanced in contrast to the even Sm nuclei. A further analysis shows that the transitional behaviors related to pairing in the Sm nuclei can be well described by the mean field plus pairing interaction model, with a monotonic decrease in the pairing strength G.
Citation: Chinese Physics C
PubDate: 2015-10-14T23:00:00Z
Issue No: Vol. 39, No. 10 (2015)

• Deuteron form factors in a phenomenological approach
• Authors: Liang Cui-Ying; Dong Yu-Bing
First page: 104104
Abstract: The electromagnetic form factors of the deuteron, particularly its quadrupole form factor, are studied with the help of a phenomenological Lagrangian approach where the vertex of the deuteron–proton–neutron with D -state contribution is explicitly taken into account. The results show the importance of this contribution to the deuteron quadrupole form factor in the approach.
Citation: Chinese Physics C
PubDate: 2015-10-14T23:00:00Z
Issue No: Vol. 39, No. 10 (2015)

• Spatial distributions of magnetic field in the RHIC and LHC energy regions
• Authors: Zhong Yang; Yang Chun-Bin, Cai Xu Feng Sheng-Qin
First page: 104105
Abstract: Relativistic heavy-ion collisions can produce extremely strong magnetic fields in the collision regions. The spatial variation features of the magnetic fields are analyzed in detail for non-central Pb–Pb collisions at LHC at ##IMG## [http://ej.iop.org/images/1674-1137/39/10/104105/cpc_39_10_104105ieqn1.gif] {$\sqrt{s_{\rm NN}}=900$} , 2760 and 7000 GeV and Au–Au collisions at RHIC at ##IMG## [http://ej.iop.org/images/1674-1137/39/10/104105/cpc_39_10_104105ieqn2.gif] {$\sqrt{s_{\rm NN}}=62.4$} , 130 and 200 GeV. The dependencies of magnetic field on proper time, collision energies and impact parameters are investigated in this paper. It is shown that an enormous and highly inhomogeneous spatial distribution magnetic field can indeed be created in off-centre relativistic heavy-ion collisions in RHIC and LHC energy regions. The enormous magnetic field is produced just after the collision, and the magnitude of magnetic field of the LHC energy...
Citation: Chinese Physics C
PubDate: 2015-10-14T23:00:00Z
Issue No: Vol. 39, No. 10 (2015)

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