Sheffield Responsive RA for exploitation of ADMX, ATLAS, LZ, T2K

本提案是为4个响应RA位置，以协助利用我们参与的实验，ADMX，ATLAS，LZ和T2 K，与完整的细节，在案件中的支持所附。目标是招募新的博士后研究人员，合同期为2.5年。该职位的长度是理想的新毕业的博士生，以进一步他们的职业生涯在粒子物理学和发展为独立的研究人员。RA将参加小组活动，并将有机会参加和组织小组研讨会和期刊俱乐部，以及与硕士和博士水平的研究生合作。(1)改进测量光子诱导过程UPC碰撞与ATLAS探测器这篇文章的重点是扩展相空间可通过电子和光子与ATLAS实验和利用这些新的发展在测量光子诱导过程cesses，建立在Anastopoulos和Lohwasser的重要专业知识。具体地，该柱将导致SM gg -> gg，过程的可接近基准横截面加倍，并且将允许扩展到较低的质量和改善光子诱导过程中对BSM物理的限制。这将通过开发超越最先进的电子和光子重建、识别和校准算法来实现，这一努力需要大量的专业知识和事先参与。(2)利用T2 K远探测器的钆负载来提高对CP破坏的灵敏度这篇文章的重点是利用T2 K远探测器的最新升级来最大限度地提高对Dirac相位CP破坏参数delta（CP）的灵敏度。T2 K用来实现对这个参数的灵敏度的主要手柄是比较中微子模式（“前角电流”）的振荡结果和反中微子模式（“反向角电流”）的数据。目前，这种灵敏度的一个主要限制因素是在反向喇叭电流（RHC）模式下收集的数据包含来自“错误符号”中微子的显著污染（约20%）。提高T2 K搜索CP破坏的物理范围需要提高区分中微子相互作用和反中微子相互作用的能力。(3)重建，识别和测量LZ中子诱导多次散射的新技术这篇文章的重点是分析LUX-ZEPLIN（LZ）实验的数据。LZ中的一个主要问题是由中子散射产生的WIMP诱导的NR信号的不可约核反冲（NR）背景的水平。这篇文章将开发和应用变革性的新技术，用于重建，识别和测量中子诱导的多次散射（MS）NR事件。这些事件将用于在FlameNEST框架内实施的轮廓似然比（PLR）拟合，以估计WIMP搜索感兴趣区域（ROI）中的中子诱导单次散射（SS）NR事件群。这将首次使WIMP暗物质NR信号能够在LZ数据中有信心地识别。(4)ADMX Axion Search Exploitation加速器和直接搜索WIMP的结果在不断增加的灵敏度水平上导致了对轴子暗物质的兴趣迅速增加。Daw是美国Axion暗物质实验（ADMX）合作的唯一英国成员，该合作在QCD轴子的敏感性方面领先世界。专注于ADMX数据分析的谢菲尔德PDRA将使谢菲尔德能够领导下一阶段的ADMX数据分析，进一步加强英国与ADMX的合作，并促进组建ADMX/QSHS联合分析工作组，该工作组由拟议的PDRA、

This proposal is for 4 responsive RA positions to assist in the exploitation of the experiments we areinvolved in, ADMX, ATLAS, LZ and T2K, with full details given in the case for support attached. The goal is to recruit new postdoctoral researchers for a 2.5 years contract. The length of theposts is ideal for newly graduated PhD students to further their careers in particle physics and developas independent researchers. RAs will join the group activities and will be given the chance to join andorganise the group seminars and journal clubs, as well to work with research students both at the Mastersand PhD level.(1) Improving the measurement of Photon- Induced Processes in UPC collisions with the ATLAS detectorThis post is focused on extending the phase space accessible via electrons and photons with the ATLAS experiment and the exploitation of these new developments in measurements of photon-induced pro- cesses, building up on the significant expertise of Anastopoulos and Lohwasser. Specifically, the post will lead to a doubling of the accessible fiducial cross-section for the SM gg -> gg, process and will allow for extension to lower masses and improvement of the limits on BSM physics in photon-induced processes. This will be achieved by developing beyond the state-of-the-art electron and photon reconstruction, identification and calibration algorithms, an endeavour that requires significant expertise and prior involvement. (2) Exploitation of the gadolinium loading at the T2K far detector to improve sensitivity to CP violationThis post is focused on exploiting recent upgrades to the T2K far detector to maximise sensitivity to the Dirac-phase CP violation parameter, delta(CP). The main handle that T2K uses to achieve sensitivity to this parameter is to compare oscillation results from its neutrino mode ("Forward Horn Current") to those obtained from data in its antineutrino mode ("Reverse Horn Current"). At present, a major limiting factor in this sensitivity is that face that data collected in Reverse Horn Current (RHC) mode contain significant contamination (about 20%) from 'wrong-sign' neutrinos. Improving the physics reach of the T2K search for CP violation requires enhancing the ability to distinguish neutrino interactions from antineutrino interactions. (3) New techniques for reconstructing, identifying and measuring neutron-induced multiple scatter in LZThis post is focused on analysis of data from the LUX-ZEPLIN (LZ) experiment. A major concern in LZ is the level of irreducible nuclear recoil (NR) background to WIMP-induced NR signals generated by neutron scattering. This post will develop and apply transformative new techniques for reconstructing, identifying and measuring neutron-induced multiple scatter (MS) NR events. These events will be used in a profile-likelihood ratio (PLR) fit, implemented within the FlameNEST framework, to estimate the population of neutron-induced single scatter (SS) NR events in the WIMP search region of interest (ROI). This will, for the first time, enable a WIMP dark matter NR signal to be identified with confidence in LZ data. (4) ADMX Axion Search ExploitationNull results from accelerator and direct searches for WIMPs at ever-increasing sensitivity levels have led to rapidly increasing interest in axion dark matter. Daw is the sole UK member of the US Axion Dark Matter eXperiment (ADMX) collaboration, which leads the world in sensitivity for the QCD axion. A Sheffield PDRA focused on ADMX data analysis would allow Sheffield to lead the next phase of ADMX data analysis, further reinforce UK collaboration with ADMX, and facilitate the formation of a joint ADMX/QSHS analysis taskforce consisting of the proposed PDRA,