Search for a neutral long-lived particle decaying to b-jets.

机译：寻找衰减到b喷射的中性长寿命粒子。

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The existence of the Higgs boson is required by the Standard Model of particle physics, yet it has not been observed. The precise nature of the Higgs boson is unknown and the mechanism by which it interacts with known Standard Model particles is also not known. Long-lived, electrically neutral hadrons have recently been proposed in hidden-valley models and could constitute a pathway through which the Higgs boson communicates with the Standard Model. Such a scenario may provide a novel path to Higgs discovery at the Tevatron.;This thesis describes a search for a neutral, long-lived particle produced in decays of Higgs bosons in pp¯ collisions at a center-of-mass energy of s = 1.96 TeV, which decays to b-jets and lives long enough to travel at least 1.6 cm before decaying. This analysis uses 3.65 fb-1 of data recorded with the Run II DO detector at the Fermilab Tevatron collider from April 2002 to August of 2008. We perform a search for eight possible hidden-valley scenarios resulting from a Higgs decay. No significant excess over background is observed and cross-section limits are placed at 95% CL.

机译：希格斯玻色子的存在是粒子物理学的标准模型所必需的，但尚未被观察到。希格斯玻色子的确切性质是未知的，并且它与已知的标准模型粒子相互作用的机理也未知。最近在隐谷模型中提出了长寿命的电中性强子，它们可能构成希格斯玻色子与标准模型进行通信的途径。这种情况可能为在Tevatron上发现希格斯提供了一条新的途径。本论文描述了在质心能量s =的情况下寻找pp碰撞中希格斯玻色子衰变中产生的中性，长寿命粒子的搜索。 1.96 TeV，它会衰减为b型喷射流，并且寿命足够长，在衰减之前至少传播1.6厘米。该分析使用了2002年4月至2008年8月在费米实验室Tevatron对撞机上用Run II DO检测器记录的3.65 fb-1数据。我们搜索了由希格斯衰变导致的八种可能的暗谷情况。没有观察到超过背景的显着过量，并且横截面极限位于95％CL。

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作者
Johnson, Chad.;
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作者单位

Columbia University.;

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授予单位 Columbia University.;
学科 Physics Elementary Particles and High Energy.
学位 Ph.D.
年度 2009
页码 149 p.
总页数 149
原文格式 PDF
正文语种 eng
中图分类
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入库时间 2022-08-17 11:38:25

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专利

1. Search for light long-lived neutral particles produced in pp collisions at (sqrt{s} = 13~mathrm {TeV}) and decaying into collimated leptons or light hadrons with the ATLAS detector [J] . Aad G., Abramowicz H., Pereira R. Araujo, European physical journal . 2020,第5期

机译：搜索以（ SQRT {S} = 13〜 MATHRM {TEV} ）在PP碰撞中产生的轻的长寿中性粒子，并用地图探测器衰减进入准直的Leptons或Light Hadrons
2. Search for long-lived neutral particles decaying into lepton-jets in 20.3 fb?1 proton-proton collisions at √s = 8 TeV with the ATLAS detector [J] . Marco Schioppa EPJ Web of Conferences . 2016,第12期

机译：使用ATLAS探测器在√s= 8 TeV的20.3 fb ？1 质子-质子碰撞中搜索衰变成轻子喷嘴的长寿命中性粒子
3. Search for pair-produced long-lived neutral particles decaying to jets in the ATLAS hadronic calorimeter in pp collisions at root s=8 TeV [J] . Aad G., Abbott B., Abdallah J., Physics Letters, B. Nuclear Physics and High Energy Physics . 2015,第Null期

机译：在根s = 8 TeV的pp碰撞中，在ATLAS强子热量计中搜索成对产生的长寿命中性粒子，这些粒子会衰减为射流
4. Search for long-lived neutral particle decays with first 1.9 fb~(-1) of 2011 data collected with the ATLAS detector at the LHC [C] . D. Salvatore Hadron Collider Physics Symposium . 2013

机译：在LHC上用ATLAS检测器收集的2011年数据的第一个1.9 FB〜（-1）的长寿中性粒子衰减
5. First search for long-lived neutral kaon decaying to two neutral pions, neutrino, and antineutrino and long-lived neutral kaon decaying to two neutral pions and pseudoscalar sgoldstino. [D] . Nix, Jonathan D. 2007

机译：首先寻找长寿命的中性kaon衰变为两个中性离子，中微子和反中微子，以及长寿命的中性kaon衰变为两个中性离子和伪标量sgoldstino。
6. Search for massive long-lived particles decaying semileptonically in the LHCb detector [O] . R. Aaij, B. Adeva, M. Adinolfi, -1

机译：在LHCb检测器中搜索大量半衰变衰变的长寿命粒子
7. Search for long-lived neutral particles in pp collisions at $${sqrt{s}} = 13~{ext { TeV}}$$ that decay into displaced hadronic jets in the ATLAS calorimeter [O] . M. Aaboud, G. Aad, B. Abbott, 2019

机译：在$$ { sqrt {s}} = 13〜{ text {tev}} = 13〜{ text {tev}}衰减进入ATLAS量热计中的位移的PORRONIC Jets

Search for a neutral long-lived particle decaying to b-jets.

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