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首页> 外文期刊>Physical review, D >Determining the strong phase of the a1 meson decay amplitude using the W→ντ(→νa1(→π?π?π±)) process
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Determining the strong phase of the a1 meson decay amplitude using the W→ντ(→νa1(→π?π?π±)) process

机译:使用W→τ(→νA1(→π→π→))过程确定A1 MESON衰变幅度的强相位

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摘要

To measure the helicity of a spin-1 meson from the triple vector product of the three-momenta of its decay products, one needs information about the strong phase of the decay amplitude. In this paper, taking a 1 ( 1260 ) meson as an example, we present a method to extract information about the strong phase from the triple vector product of the pion momenta in the W → ν τ ( → ν a 1 ( → π ? π ? π ± ) ) process, where the a 1 helicity is known a?priori from electroweak theory. This process is advantageous in that highly boosted a 1 ? mesons from τ L ? decays have nearly maximal helicity asymmetry and thus most reflect the strong phase. We revisit the theoretical calculation of the a 1 meson helicity in the W → ν τ ( → ν a 1 ) process. Next, we formulate the differential decay rate of polarized a 1 mesons in a manner convenient for the study of the a 1 meson helicity asymmetry. Finally, we present the method for extracting information about the strong phase, and assess its feasibility at the LHC.
机译:为了测量旋转三码乘以衰减产品三线的三维载体的螺旋 - 1颗粒的螺旋性,需要有关衰变幅度的强阶段的信息。在本文中,以1(1260)MESON为例,我们介绍了一种方法来从W→ττ(→ν1(→π? π?π±))工艺,其中1升螺旋是已知的,从Electroweak理论中得到了优先考虑。该过程在高度升高的A 1中是有利的?犹太来自τl?衰变具有几乎最大的螺旋性不对称,因此最大反映了强相位。我们重新审视W→τ(→νA1)过程中的1秒升螺旋的理论计算。接下来,我们以方便地对A中思逊螺旋不对称的方式的方式配制偏振A.1颗粒的差分衰减速率。最后,我们介绍了提取有关强相位的信息的方法,并评估其在LHC的可行性。

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