CAREER: Search for Extra Dimensions in Space

这份职业提案要求支持一项广泛的实验计划，该计划将在未来五年内由费米国家加速器实验室Tevatron的D0实验收集第二次运行中的空间额外维度(ED)数据。大多数拟议的搜查都将是第一次进行。该计划基于那些预计对各种EDS模型以及其他新物理最敏感的频道。对于其中一些通道，需要专门的多电平触发；因此，触发器的设计和优化是建议的活动之一。在已经实验研究的通道中，对于任意数目的ED，期望的灵敏度比当前最佳极限高2-3倍，n=2，与桌面重力实验的范围相当。这将给D0提供一个从ED中寻找信号或显著限制各种模型的允许参数空间的绝佳机会。虽然D0的参与是布朗大学高能物理(HEP)小组目前的主要活动，但加入日内瓦欧洲核子研究中心(CERN)的大型强子对撞机(LHC)实验是自然的下一步。最近，S.Dimopoulos和PI(分别是S.Gidding和S.Thomas)为大型ED提出了一个新的签名：在大型强子对撞机和更远的地方有大量黑洞产生的可能性。作为拟议活动的一部分，PI计划与ATLAS和CMS合作密切合作，模拟和研究大型强子对撞机上黑洞产生的现象学。还建议在未来的对撞机上继续对黑洞产生的现象学研究。这项建议包括一些协同活动，例如本科生和研究生继续参与现代粒子物理前沿的研究。特别是，建议通过吸引更多来自越南的学生到参与D0的美国大学研究生院继续教育，在D0合作中工作，扩大与越南HEP团体新建立的联系。其他拟议的外联活动包括在科普期刊上发表一些关于太空中的EDS和实验室中的黑洞这一令人兴奋的主题的公开讲座和文章。

This CAREER proposal requests support for an extensive experimental program of searches for extra dimensions (EDs) in space in the Run 2 data to be collected by the D0 experiment at the Fermi National Accelerator Laboratory Tevatron over the next five years. Most of the proposed searches will be carried out for the first time. This program is based on those channels expected to be most sensitive to various EDs models as well as to other new physics. For some of these channels, a specialized multi-level triggering is required; therefore the design and optimization of the trigger is among the proposed activities. In the channels already studied experimentally, the expected sensitivity is 2-3 times higher than the current best limits for any number of EDs, n 2, and is comparable to the reach of tabletop gravity experiments for n = 2. This would give D0 an excellent opportunity to either find a signal from EDs or to restrict significantly the allowed parameter space of the various models. While the D0 involvement is the major current activity of the Brown University High Energy Physics (HEP) group, joining one of the Large Hadron Collider (LHC) experiments at CERN, Geneva is a natural next step. Recently, S. Dimopoulos and the PI (and separately S. Giddings and S. Thomas) have proposed a novel signature for large EDs: a possibility of copious black hole production at the LHC and beyond. As a part of the proposed activities, the PI plans to work closely with the ATLAS and CMS collaborations in simulating and studying the phenomenology of black hole production at the LHC. It is also proposed to continue phenomenological research on black hole production at future colliders.This proposal includes a number of synergistic activities, such as the continuous involvement of undergraduate and graduate students in research at the cutting edge of modern particle physics. In particular, it is proposed to expand the newly established ties with the Vietnamese HEP groups via attracting more students from Vietnam to work in the D0 Collaboration by continuing their education in the graduate schools of the US universities involved in D0. Other proposed outreach activities include a number of public lectures and articles in popular science journals on the exciting subject of EDs in space and black holes in the lab.