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Gamma-gamma collider is a challenging new type of particle collider that can produce complementary and unique new physics compared to other type of colliders (hh, ee and eh). It can be used as a Higgs...
在自由空间光通信(FSO)中,由系统设计以及大气湍流所引起的光强闪烁和相位起伏会造成圆偏振控制误差,这严重影响圆偏振位移键控(CPolSK)通信系统的性能。因此,基于Gamma-Gamma大气信道模型,在较全面考虑光强起伏、相位噪声和圆偏振控制误差三个参数的基础上,建立了CPolSK系统信道的数学统计模型,推导了平均信道容量的闭合表达式,仿真研究了误码率在连续相位噪声下的性能以及三个参数对信道容量...
K(S)-]GAMMA-GAMMA, K(L)-]PI(0)GAMMA-GAMMA AND UNITARITY
Γ agreement experimental value lap chiral perturbation theory the dispersion relation
2014/12/23
Agreement between the experimental value Γ(KS→γγ) and the number predicted via a one-loop chiral perturbation theory calculation has been cited as a success for the latter. On the other hand the one-l...
THE REACTIONS GAMMA-GAMMA-]WL(+)WL(-) AND GAMMA-GAMMA-]Z(L)Z(L) IN SU(N) STRONGLY INTERACTING THEORIES
Low energy inflation models fermion
2014/12/23
In theories in which the parameters of the low energy theory are not unique, perhaps having different values in different domains of the universe as is possible in some inflationary models, the fermio...
Decay pi(0)->gamma gamma to next to leading order in chiral perturbation theory
Decay of amplitude induced mixing pure state low energy
2014/12/20
The π0→γγ decay width is analyzed within the combined framework of chiral perturbation theory and the 1/Nc expansion up to O(p6) and O(p4×1/Nc) in the decay amplitude. The η′ is explicitly included in...
LDPC在gamma-gamma信道下的性能分析
光通信 低密度奇偶校验码 调制方式 gamma-gamma湍流信道
2014/3/31
为了提高无线光通信系统的性能,将低密度奇偶校验码作为信道编码,在已知信道状态信息的条件下,对低密度奇偶校验码(LDPC)+二进制脉冲位置调制(BPPM)系统与LDPC+开关键控(OOK)系统分别在加性高斯白噪声(AWGN)、弱湍流、中等湍流和强湍流信道中的性能进行了比较;仿真了OOK和BPPM在各个强度湍流信道下的编码增益;并对LDPC结合不同进制数的脉冲位置调制(PPM)进行了分析。结果表明,L...
Performance Analysis of Decode-and-Forward Relaying in Gamma-Gamma Fading Channels
Performance Analysis Decode-and-Forward Gamma-Gamma Fading Channels Information Theory
2012/5/24
Decode-and-forward (DF) cooperative communication based on free space optical (FSO) links is studied in this letter. We analyze performance of the DF protocol in the FSO links following the Gamma-Gamm...
分析了在Gamma-Gamma分布下基于脉冲位置调制(pulse position modulation, PPM)方式的多输入输出自由空间光学（multiple input multiple output free space optics, MIMO-FSO）通信系统模型。首先推导了单输入单输出（single input single output, SISO)-PPM系统的误时隙率（slot...
Starting from hyperbolic dispersion relations, we derive a system of Roy--Steiner equations for pion Compton scattering that respects analyticity, unitarity, gauge invariance, and crossing symmetry.
Starting from hyperbolic dispersion relations, we derive a system of Roy--Steiner equations for pion Compton scattering that respects analyticity, unitarity, gauge invariance, and crossing symmetry. I...
分析了在Gamma-Gamma分布下基于脉冲位置调制(pulse position modulation, PPM)方式的多输入输出自由空间光学（multiple input multiple output free space optics, MIMO-FSO）通信系统模型。首先推导了单输入单输出（single input single output, SISO)-PPM系统的误时隙率（slot...
Measurement of the gamma gamma* --> eta_c transition form factor
gamma gamma momentum transfer
2010/3/15
We study the reaction e+e- --> e+e- eta_c, eta_c --> K_S K+- pi-+ and obtain eta_c mass and width values 2982.2+-0.4+-1.6 MeV/c^2 and 31.7+-1.2+-0.8 MeV, respectively. We find Gamma(eta_c --> gamma ga...
Observation of the chi_c2(2P) meson in the reaction gamma gamma -> D Dbar at BABAR
chi_c2(2P) meson DDbar system integrated luminosity
2010/3/15
A search for the Z(3930) resonance in gamma gamma production of the DDbar system has been performed using a data sample corresponding to an integrated luminosity of 384 fb^-1 recorded by the BABAR exp...
Performance analysis of bit error rate for free space optical communication with tip-tilt compensation based on gamma–gamma distribution
free space optical communication atmospheric turbulence
2011/5/10
In this paper, the gamma – gamma probability distribution is used to model turbulent channels. The bit error rate (BER) performance of free space optical (FSO) communication systems employing on-off k...
Extensions of the Extrema Bounds for the Pomeron Intercept to Meson-Proton, Gamma-Proton and Gamma-Gamma Scattering
the Extrema Bounds the Pomeron Intercept Meson-Proton Gamma-Proton Gamma-Gamma Scattering
2010/10/19
Making use of the extrema bounds for the soft pomeron intercept, recently determined by fits to pp and ¹pp data (from both accelerator and cosmic-ray experiments), we investigate the total cross ...