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arXiv 1107.1773hep-ex
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在sqrt(s)= 7 TeV的pp碰撞中寻找激发轻子

A search for excited leptons in pp Collisions at sqrt(s) = 7 TeV

CMS Collaboration

摘要:

利用在sqrt(s)= 7 TeV下记录的36个反皮电子的pp碰撞数据,在LHC上用CMS探测器进行了激发轻子的搜索。搜索进行相关的生产轻子和带相反电荷的激发轻子pp到l l*,然后由衰变l* 到l γ,导致在l γ最终状态,其中l =电子或μ子。未观察到超过标准模型预期的事件。解释的背景下,通过四个费米子接触相互作用和随后的衰变通过电弱过程中的L* 生产的调查结果,第一上限报告L* 生产在这个碰撞能量。在复合尺度λ和激发轻子质量M(l*)参数空间中的排斥区被扩展到超出先前建立的极限。对于λ = M(l*),在95%的置信水平下,e* 的激发轻子质量在1070 GeV/c^2以下,mu* 的激发轻子质量在1090 GeV/c^2以下。

英文摘要:

A search for excited leptons is carried out with the CMS detector at the LHC, using 36 inverse picobarns of pp collision data recorded at sqrt(s) = 7 TeV. The search is performed for associated production of a lepton and an oppositely charged excited lepton pp to l l*, followed by the decay l* to l gamma, resulting in the l l gamma final state, where l = electron or muon. No excess of events above the standard model expectation is observed. Interpreting the findings in the context of l* production through four-fermion contact interactions and subsequent decay via electroweak processes, first upper limits are reported for l* production at this collision energy. The exclusion region in the compositeness scale Lambda and excited lepton mass M(l*) parameter space is extended beyond previously established limits. For Lambda = M(l*), excited lepton masses are excluded below 1070 GeV/c^2 for e* and 1090 GeV/c^2 for mu* at the 95% confidence level.

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