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：
10.1142/s0217732313300152
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发表时间：
2012-06
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
摘要在大型强子对撞机的希格斯搜索中，实验数据并未排除轻希格斯玻色子 $ \left( {{115}\,{\text{GeV}} \lesssim {M_{\text{H}}} \lesssim {13}0\,{\text{GeV}}} \right) $ 的可能性。在这个质量范围内，标准模型希格斯玻色子的宽度比其质量小四个数量级以上。因此，零宽度近似预计将是一个极好的近似。我们证明情况并非总是如此。包含壳外贡献对于获得 1% 精度水平的精确希格斯信号归一化至关重要。对于 gg (→ H) → VV, V = W,Z, $ \mathcal{O} $(10 %) 由于 MV V> 2 MV 区域中的希格斯信号增强而发生校正，该区域也发生相当大的希格斯连续谱干扰。我们讨论如何使用实验选择切割来排除搜索通道中无法重建希格斯不变质量的区域。我们注意到弱玻色子聚变中的 H → V V 衰变模式也受到类似的影响。
A bstractIn the Higgs search at the LHC, a light Higgs boson $ \left( {{115}\,{\text{GeV}} \lesssim {M_{\text{H}}} \lesssim {13}0\,{\text{GeV}}} \right) $ is 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, $ \mathcal{O} $(10 %) corrections occur due to an enhanced Higgs signal in the region MV V> 2 MV, 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 → V V decay modes in weak boson fusion are similarly affected.