Inadequacy of zero-width approximation for a light Higgs boson signal
Inadequacy of zero-width approximation for a light Higgs boson signal
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DOI：
10.1007/jhep08(2012)116
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发表时间：
2012-08
影响因子：
5.4
通讯作者：
N. Kauer;G. Passarino
中科院分区：
文献类型：
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作者：
N. Kauer;G. Passarino
在大型强子对撞机的希格斯粒子搜索中，实验数据并没有排除轻希格斯玻色子。在这个质量范围内，标准模型希格斯玻色子的宽度比它的质量小四个数量级以上。因此，零宽度近似预计是一个很好的近似。我们表明，这并不总是如此。包括壳外贡献是必不可少的，以获得准确的希格斯信号归一化在1%的精度水平。对于gg（→ H）→ VV，V= W，Z，（10%）的修正是由于在M VV> 2 M V的区域中Higgs信号的增强而产生的，在该区域中也发生了相当大的Higgs连续谱干涉。我们讨论了如何实验选择削减可以用来排除这个区域的搜索通道中的希格斯不变质量不能重建。我们注意到弱玻色子聚变中的H→ VV衰变模也受到类似的影响。
In the Higgs search at the LHC, a light Higgs bosonis not excluded by experimental data. In this mass range, the width of the Standard Model Higgs boson is more than four orders of magnitude smaller than its mass. The zero-width approximation is hence expected to be an excellent approximation. We show that this is not always the case. The inclusion of off-shell contributions is essential to obtain an accurate Higgs signal normalisation at the 1% precision level. For gg (→ H)→ VV, V= W, Z,(10%) corrections occur due to an enhanced Higgs signal in the region M VV> 2 M V, where also sizable Higgs-continuum interference occurs. We discuss how experimental selection cuts can be used to exclude this region in search channels where the Higgs invariant mass cannot be reconstructed. We note that the H→ VV decay modes in weak boson fusion are similarly affected.