Search for high-mass resonances decaying to dilepton final states in pp collisions at √s=7 TeV with the ATLAS detector
Search for high-mass resonances decaying to dilepton final states in pp collisions at √s=7 TeV with the ATLAS detector
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DOI：
10.1007/jhep11(2012)138
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发表时间：
2012-11-01
影响因子：
5.4
通讯作者：
Zwalinski, L.
中科院分区：
文献类型：
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作者：
Aad, G.;Abajyan, T.;Zwalinski, L.
提出了对两个具有相同电荷的瞬发、孤立轻子的异常产生的包容性搜索。搜索是在与 2011 年 LHC 的 ATLAS 探测器在根 s = 7TeV 处收集的 4.7 fb(-1) 积分光度相对应的数据样本中进行的。选择具有大横向动量的轻子对（e(+/-)e(+/-)、e(+/-)mu(+/-) 和 mu(+/-)mu(+/-)），并检查双轻子不变质量分布是否与标准模型期望有任何偏差。没有发现过量，并且来自标准模型之外的物理过程的同号轻子对的产生横截面的上限被设置为接近实验选择标准的基准区域内的双轻子不变质量的函数。异常 e(+/-)e(+/-)、e(+/-)mu(+/-) 或 mu(+/-)mu(+/-) 产生横截面的 95% 置信度上限在 1.7 fb 和 64 fb 之间，具体取决于双轻子质量和味道组合。大型强子对撞机的 ATLAS 探测器用于搜索衰减为电子-正电子对或 μ 子-反 μ 子对的高质量共振。该搜索对重中性 Z' 规范玻色子、Randall-Sundrum 引力子、Z* 玻色子、techni-介子、Z/gamma 玻色子和 Torsion 模型预测的玻色子敏感。结果是基于 7 TeV 质心能量下的 pp 碰撞分析得出的，对应于 e(+)e(-) 通道中的积分光度为 4.9 fb(-1)，mu(+)mu(-) 通道中的积分光度为 5.0 fb(-1)。对于质量低于 2.22 TeV 的 Z' 玻色子，在 95% 的置信水平下被排除在外。对于低于 2.16 Tev 的质量，耦合 k 根 M-P1 = 0.1 的 Randall-Sundrum 引力子在 95% 置信水平下被排除。还介绍了对其他模型的限制，包括 Technicolor 和 Minimal Z' 模型。
An inclusive search for anomalous production of two prompt, isolated leptons with the same electric charge is presented. The search is performed in a data sample corresponding to 4.7 fb(-1) of integrated luminosity collected in 2011 at root s = 7TeV with the ATLAS detector at the LHC. Pairs of leptons (e(+/-)e(+/-), e(+/-)mu(+/-), and mu(+/-)mu(+/-)) with large transverse momentum are selected, and the dilepton invariant mass distribution is examined for any deviation from the Standard Model expectation. No excess is found, and upper limits on the production cross section of like-sign lepton pairs from physics processes beyond the Standard Model are placed as a function of the dilepton invariant mass within a fiducial region close to the experimental selection criteria. The 95% confidence level upper limits on the cross section of anomalous e(+/-)e(+/-), e(+/-)mu(+/-), or mu(+/-)mu(+/-) production range between 1.7 fb and 64 fb depending on the dilepton mass and flavour combination.The ATLAS detector at the Large Hadron Collider is used to search for high-mass resonances decaying to an electron-positron pair or a muon-antimuon pair. The search is sensitive to heavy neutral Z' gauge bosons, Randall-Sundrum gravitons, Z* bosons, techni-mesons, Z/gamma bosons, and bosons predicted by Torsion models. Results are presented based on an analysis of pp collisions at a center-of-mass energy of 7 TeV corresponding to an integrated luminosity of 4.9 fb(-1) in the e(+)e(-) channel and 5.0 fb(-1) in the mu(+)mu(-) channel. A Z' boson with Standard Model-like couplings is excluded at 95% confidence level for masses below 2.22 TeV. A Randall-Sundrum graviton with coupling k root M-P1 = 0.1 is excluded at 95% confidence level for masses below 2.16 Tev. Limits on the other models are also presented, including Technicolor and Minimal Z' Models.