Title: Measuring the Higgs boson parity at a Linear Collider using the tau impact parameter and tau --> rho nu decay Show Chinese title

Title: 在直线对撞机上利用tau子的碰撞参数和tau→rho nu衰变测量希格斯玻色子的宇称

Abstract: We demonstrate that a measurement of the impact parameter in one-prong tau decay can be useful for the determination of the Higgs boson parity in the H/A --> tau tau; tau --> rho nu decay chain. We have estimated that for a detection set-up such as TESLA, use of the information from the tau impact parameter can improve the significance of the measurement of the parity of the Standard Model 120 GeV Higgs boson to 4.5 sigma, and in general by factor of about 1.5 with respect to the method where this information is not used. We also show that the variation in the assumption on the precision of the measurement of the impact parameter and/or pi's momenta does not affect the sensitivity of the method. This is because the method remains limited by the type of twofold ambiguity in reconstructing the tau momentum. Show Chinese abstract

Abstract: 我们证明，在单分支τ衰变中对碰撞参数的测量对于确定H/A中的希格斯玻色子宇称是有用的→ττ；τ→ρν衰变链。 我们估计，对于如TESLA这样的探测装置，利用τ碰撞参数的信息可以将标准模型120 GeV希格斯玻色子宇称测量的显著性提高到4.5σ，并且总体上比不使用此信息的方法提高了约1.5倍。 我们还表明，对碰撞参数和/或π介子动量测量精度的假设变化不会影响该方法的灵敏度。 这是因为该方法仍然受到重建τ动量的双重模糊性的限制。