Study of B^---> J/psi K^-pi^+pi^- decays and measurement of the B^---> X(3872) K^- Branching Fraction.
Study of B^---> J/psi K^-pi^+pi^- decays and measurement of the B^---> X(3872) K^- Branching Fraction.
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DOI：
10.1103/physrevd.71.071103
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发表时间：
2005-04
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影响因子：
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通讯作者：
A. D'orazio
中科院分区：
文献类型：
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作者：
A. D'orazio
作者利用在PEP-II e{sup+}e{sup-}非对称储能环上与Babar探测器的(4S)共振收集的1.17亿个B{bar B}事件研究了衰变B{sup-}J/{psi}K{sup-}{pi}{sup+}{pi}{sup-}。它们测量分支分数{Beta}(B{sup-}{殖利率}J/{psi}K{sup-}{pi}{sup+}{pi}{sup-})=(116{+-}7(统计){+-}9(系统))X10{sup-5}和{Beta}(B{sup-}{殖利率}X(3872)K{sup-})x{Beta}(X(3872){殖利率}J/{psi}{pi}{sup+}{pi}{sup-})=(1.280.41)x10{sup-5}，X(3872)的质量为3873.4(+-)1.4 MeV/c{sup 2}。他们在衰变中寻找h{subc}窄态和衰变中的h{subc}狭态，其中D{sup 0}{pi}{sup-}，D{sup 0}{pi}{sup-}，d{sup 0}{pi}{sup-}他们设置了90%C.L.限制{Beta}(B{sup-}{殖利率}h{subc}K{sup-})x{Beta}(h{subc}{殖利率}J/{psi}{pi}{sup+}{pi}{sup-})<；3.4x10{sup-6}和{Beta}(B{sup-}{殖利率}J/{psi}D{sup 0}{pi}{sup-})<；5.2 x 10{sup-5}。
The authors study the decay B{sup -} {yields} J/{psi}K{sup -}{pi}{sup +}{pi}{sup -} using 117 million B{bar B} events collected at the {Upsilon}(4S) resonance with the BaBar detector at the PEP-II e{sup +}e{sup -} asymmetric-energy storage ring. They measure the branching fractions {Beta}(B{sup -} {yields} J/{psi}K{sup -} {pi}{sup +}{pi}{sup -}) = (116 {+-} 7(stat.) {+-} 9(syst.)) x 10{sup -5} and {Beta}(B{sup -} {yields} X(3872)K{sup -}) x {Beta}(X(3872) {yields} J/{psi}{pi}{sup +}{pi}{sup -}) = (1.28 {+-} 0.41) x 10{sup -5} and find the mass of the X(3872) to be 3873.4 {+-} 1.4MeV/c{sup 2}. They search for the h{sub c} narrow state in the decay B{sup -} {yields} h{sub c} K{sup -}, h{sub c} {yields} J/{psi}{pi}{sup +}{pi}{sup -} and for the decay B{sup -} {yields} J/{psi}D{sup 0}{pi}{sup -}, with D{sup 0} {yields} K{sup -}{pi}{sup +}. They set the 90% C.L. limits {Beta}(B{sup -} {yields} h{sub c}K{sup -}) x {Beta}(h{sub c} {yields} J/{psi}{pi}{sup +}{pi}{sup -}) < 3.4 x 10{sup -6} and {Beta}(B{sup -} {yields} J/{psi}D{sup 0}{pi}{sup -}) < 5.2 x 10{sup -5}.