Search for nonpointing photons in the diphoton and E T miss final state in s = 7 TeV proton-proton collisions using the ATLAS detector
Search for nonpointing photons in the diphoton and E T miss final state in s = 7 TeV proton-proton collisions using the ATLAS detector
复制标题
使用 ATLAS 探测器在双光子和 E T 中搜索非指向光子，在 s = 7 TeV 质子-质子碰撞中错过最终状态
DOI：
10.1103/physrevd.88.012001
复制
发表时间：
2013
影响因子：
5
通讯作者：
Aad G
中科院分区：
文献类型：
--
作者：
Aad G
已经进行了搜索的光子起源于一个中性的长寿命粒子的衰变，利用ATLAS电磁量能器的能力，使光子的飞行方向的精确测量，以及量能器的出色的时间分辨率。利用2011年收集的7 TeV质子-质子碰撞的完整数据样本，在双光子加丢失的横能末态中进行了搜索。未观察到超出标准模型过程预期背景的过量。结果被用来设置的规范介导的超对称性破缺模型的背景下，与最轻的中性伴子是次轻的超对称粒子和衰变的寿命超过0.25纳秒的光子和引力子的排斥限制。
A search has been performed for photons originating in the decay of a neutral long-lived particle, exploiting the capabilities of the ATLAS electromagnetic calorimeter to make precise measurements of the flight direction of photons, as well as the calorimeter’s excellent time resolution. The search has been made in the diphoton plus missing transverse energy final state, using the full data sample ofof 7 TeV proton-proton collisions collected in 2011 with the ATLAS detector at the LHC. No excess is observed above the background expected from Standard Model processes. The results are used to set exclusion limits in the context of gauge mediated supersymmetry breaking models, with the lightest neutralino being the next-to-lightest supersymmetric particle and decaying with a lifetime in excess of 0.25 ns into a photon and a gravitino.