arXiv 0711.31752007-11hep-phhep-ex

通过$W_L W_L$衰变寻找RS引力子

Search for RS gravitons via $W_L W_L$ decays

Oleg Antipin, David Atwood, Amarjit Soni

备注：: 19 pages, 6 figures, 4 tables; Accepted for publication in Phys. Lett. B
发表信息：: Phys.Lett.B666:155-161,2008
DOI：: 10.1016/j.physletb.2008.07.009

摘要：

原始的Randall-Sundrum（RS）模型具有扭曲的额外维度以及扩展，为同时解决普朗克弱层次问题以及标准模型（SM）中的味道难题提供了可能性。这种情况下最显著的特征是存在卡鲁扎-克莱因（KK）引力子，其质量和与SM场的耦合由TeV标度设定。在这个框架的某些现实版本中，引力子与观测粒子的最大耦合是顶夸克和非物理希格斯玻色子（$W^{\pm}_L$和$Z_L$），其KK引力子（G）质量预测为$\gsim$ 4 TeV。通过研究引力子的共振产生及其随后衰变为$W_L W_L$对，我们将先前关于KK引力子衰变的工作扩展到$t\bar{t}$末态和"镀金“$Z_L Z_L$模（每个Z衰变为$e^+ e^-$或$μ^+ μ^-$）。我们发现，300 $fb^{-1}$积分光度的数据的半轻子$G \to W (\to l ν_l) W(\to 2 jets)$模式提供了一个很好的机会，寻找RS KK引力子模式的质量轻于$\sim$ 3-3.5 TeV的欧洲核子研究中心的LHC。在半轻子模式下有效地重建WW质量，并结合对纯轻子通道中双轻子质量分布的分析，$pp \to W (\to l ν_l) W(\to l^\prime ν_{l^\prime})$可能有助于分别观测KK $Z^\prime$和KK引力子.适当定义的半轻子模中带电轻子的平均能量可以用来区分纵向和横向W玻色子的衰变。

英文摘要：

The original Randall-Sundrum (RS) model with a warped extra dimension along with extensions provides the possibility for a simultaneous solution to Planck-weak hierarchy problem as well as the flavor puzzle in the Standard Model (SM). The most distinctive feature of this scenario is the existence of Kaluza-Klein (KK) gravitons whose masses and couplings to the SM fields are set by the TeV scale. In some realistic versions of this framework, the largest coupling of the gravitons to the observed particles is to the top quark and unphysical Higgses ($W^{\pm}_L$ and $Z_L$) with the KK graviton (G) masses predicted to be $\gsim$ 4 TeV. We extend earlier works on the KK graviton decays to the $t\bar{t}$ final state and to the ``gold-plated'' $Z_L Z_L$ modes (with each Z decaying to $e^+ e^-$ or to $μ^+ μ^-$) by studying the resonant production of the gravitons and their subsequent decay to $W_L W_L$ pair. We find that with 300 $fb^{-1}$ integrated luminosity of data the semileptonic $G \to W (\to l ν_l) W(\to 2 jets)$ mode offers a good opportunity to search for the RS KK graviton mode with mass lighter than $\sim$ 3-3.5 TeV at the CERN LHC. Efficient WW mass reconstruction in the semileptonic mode combined with an analysis of dilepton mass distribution in the purely leptonic channel, $pp \to W (\to l ν_l) W(\to l^\prime ν_{l^\prime})$ may help to observe KK $Z^\prime$ and KK graviton separately. Suitably defined average energy of the charged lepton in the semileptonic mode may be used to distinguish decays from longitudinal versus transverse W-bosons.

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英文摘要：

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