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arXiv 0802.1858hep-ex
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在HERA上寻找e-p碰撞中的激发中微子

A Search for Excited Neutrinos in e-p Collisions at HERA

H1 Collaboration

备注：
18 pages, 4 figures, Submitted to Phys. Lett. B
发表信息：
Phys.Lett.B663:382-389,2008
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摘要：

利用HERA H1实验收集的质心能量为319 GeV，总光度为184 pb的$e^{-}p$数据，研究了激发中微子$ν^{*}{\to}νγ$、$ν^{*}{\to}νZ$和$ν^{*}{\to}eW$的电弱衰变以及随后的$W$和$Z$玻色子的强子或轻子衰变.在规范介导的模型中导出了与质量有关的$ν^*$产生截面和耦合与复合尺度$f/Λ$的比值的排斥极限。还确定了与SU（2）和U（1）规范玻色子的相对耦合无关的$f/Λ$的极限。这些限制将排除区域扩展到比以前激发中微子搜索可能的更高质量。

英文摘要：

A search for excited neutrinos is performed using the full $e^{-}p$ data sample collected by the H1 experiment at HERA at a centre-of-mass energy of 319 GeV, corresponding to a total luminosity of 184 pb$^{-1}$.The electroweak decays of excited neutrinos $ν^{*}{\to}νγ$, $ν^{*}{\to}νZ$ and $ν^{*}{\to}eW$ with subsequent hadronic or leptonic decays of the $W$ and $Z$ bosons are considered. No evidence for excited neutrino production is found. Mass dependent exclusion limits on $ν^*$ production cross sections and on the ratio of the coupling to the compositeness scale $f/Λ$ are derived within gauge mediated models. A limit on $f/Λ$, independent of the relative couplings to the SU(2) and U(1) gauge bosons, is also determined. These limits extend the excluded region to higher masses than has been possible in previous excited neutrino searches.

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