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首页> 外文期刊>Physics of atomic nuclei >The rho -> gamma pi and omega -> gamma pi Decays in Quark-Model Approach and Estimation of Coupling for Pion Emission by Quark
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The rho -> gamma pi and omega -> gamma pi Decays in Quark-Model Approach and Estimation of Coupling for Pion Emission by Quark

机译:Quark模型方法中的rho-> gamma pi和omega-> gamma pi衰变以及Quark的离子排放耦合估计

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In the framework of the relativistic and gauge-invariant spectral integral technique, we calculate radiative decays rho(770) -> gamma pi(140) and omega(780) -> gamma pi(140) supposing all mesons (pi, rho, and omega) to be quark-antiquark states. The q (q) over bar wave functions found for mesons and photon lead to a reasonably good description of data ( Gamma((exp))(rho +/-->gamma pi +/-) = 68 +/- 30 keV, Gamma((exp))(rho 0 ->gamma pi 0) = 77 +/- 28 keV, Gamma((exp))(omega ->gamma pi 0) = 776 +/- 45 keV) which makes it possible to estimate the coupling for the bremsstrahlung emission of pion by quarks g(pi) equivalent to g(pi)(u -> d pi). We have found two values for the pion bremsstrahlung coupling: vertical bar g(pi)vertical bar = 16.7 +/- 0.3(-2.3)(+0.1) (Solution I) and vertical bar g(pi)vertical bar = 3.0 +/- 0.3(-2.1)(+0.1) (Solution II). Within SU(6) symmetry for nucleons, Solution I gives us for pi NN coupling the value 16.4 <= g(pi pNN)(2)/(4 pi) <= 23.2, which is in qualitative agreement with the pi N scattering data, g(pi NN)(2)/(4 pi) similar or equal to 14. For excited states, we have estimated the partial widths in Solution I as follows: Gamma(rho(+/-)(2S) -> gamma pi) similar or equal to 10-130 keV, Gamma(rho(0)(2S) -> gamma pi) similar or equal to 10-130 keV, Gamma(omega(2S) -> gamma pi) similar or equal to 60-1080 keV. The large uncertainties emphasize the necessity to carry out measurements of the meson radiative processes in the region of large masses.
机译:在相对论和轨距不变谱积分技术的框架内,我们假设所有介子(pi,rho和a)都计算了辐射衰减rho(770)-> gamma pi(140)和omega(780)-> gamma pi(140)欧米茄(Omega)是夸克-反夸克状态。介子和光子的bar函数的q(q)导致对数据的合理描述(Gamma((exp))(rho + /-> gamma pi +/-)= 68 +/- 30 keV, Gamma((exp))(rho 0-> gamma pi 0)= 77 +/- 28 keV,Gamma((exp))(omega-> gamma pi 0)= 776 +/- 45 keV)通过夸克g(pi)等于g(pi)(u-> d pi)估计p的the致辐射发射的耦合。我们发现了pion ms致伸缩耦合的两个值:垂直线g(pi)垂直线= 16.7 +/- 0.3(-2.3)(+ 0.1)(解决方案I)和垂直线g(pi)垂直线= 3.0 + / -0.3(-2.1)(+ 0.1)(解决方案II)。在SU(6)对称的核子中,解决方案I为pi NN耦合提供了16.4 <= g(pi pNN)(2)/(4 pi)<= 23.2的值,该值与pi N散射数据定性一致,g(pi NN)(2)/(4 pi)近似或等于14。对于激发态,我们估计溶液I的部分宽度如下:Gamma(rho(+/-)(2S)-> gamma pi)等于或等于10-130 keV,Gamma(rho(0)(2S)-> gamma pi)相似或等于10-130 keV,Gamma(omega(2S)-> gamma pi)等于或等于60 -1080 keV。较大的不确定性强调了对大质量区域介子辐射过程进行测量的必要性。

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