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arXiv 0708.4394hep-ph
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Tevatron和LHC上带电希格斯玻色子产生中自旋效应的迭代判别分析研究

Studies of Spin Effects in Charged Higgs Boson Production with an Iterative Discriminant Analysis at the Tevatron and LHC

S. Hesselbach, S. Moretti, J. Rathsman, A. Sopczak

摘要:

我们报告详细的Monte Carlo比较选择变量分离tbH+信号事件的标准模型ttbar背景使用迭代判别分析(IDA)方法。当m(H+).ne.m(W+)时,两个过程之间存在运动学差异,在带电希格斯玻色子玻色子与W+质量的近简并的特别具有挑战性的情况下,带电希格斯玻色子和W+规范玻色子之间的自旋差异的探索变得至关重要。在适当考虑自旋差异的情况下,利用TAUOLA程序包对带电Higgs和W+玻色子衰变产生的τ轻子进行了衰变。我们证明,即使个别选择变量具有有限的判别力,IDA方法实现了预期信号和背景之间的显着分离。对于Tevatron和LHC两种能量,定量研究了自旋效应和H+质量对信号和背景分离的影响。研究了硬横动量切割对去除QCD背景的影响,发现自旋效应仍然很重要。分离以纯度与效率曲线表示。该研究是针对W+质量和顶部质量附近的带电希格斯玻色子质量进行的。

英文摘要:

We report on detailed Monte Carlo comparisons of selection variables to separate tbH+ signal events from the Standard Model ttbar background using an Iterative Discriminant Analysis (IDA) method. While kinematic differences exist between the two processes whenever m(H+).ne.m(W+), the exploration of the spin difference between the charged Higgs and the W+ gauge boson becomes crucial in the particularly challenging case of near degeneracy of the charged Higgs boson mass with the W+ mass. The TAUOLA package is used to decay the tau leptons emerging from the charged Higgs and W+ boson decays taking the spin difference properly into account. We demonstrate that, even if the individual selection variables have limited discriminant power, the IDA method achieves a significant separation between the expected signal and background. For both Tevatron and LHC energies, the impact of the spin effects and H+ mass on the separation of signal and background has been studied quantitatively. The effect of a hard transverse momentum cut to remove QCD background has been studied and it is found that the spin effects remain important. The separation is expressed in purity versus efficiency curves. The study is performed for charged Higgs boson masses between the W+ mass and near the top mass.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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