The silicon vertex detector of the Belle II experiment-猫眼课题宝

DOI：

10.1088/1748-0221/17/08/c08014

发表时间：

2019-09

期刊：

Journal of Instrumentation

影响因子：

1.3

通讯作者：

中科院分区：

工程技术4区

文献类型：

作者：

A. Paladino;H. Aihara;C. Angelini;T. Aziz;V. Babu;S. Bacher;S. Bahinipati;E. Barberio;T. Baroncelli;T. Baroncelli;A. Basith;G. Batignani;A. Bauer;P. Behera;T. Bergauer-;S. Bettarini;B. Bhuyan;T. Bilka;F. Bosi;L. Bosisio;A. Bozek;F. Buchsteiner;L. Bulla;G. Casarosa;M. Ceccanti;D. Červenkov;S. Chendvankar;N. Dash;G. D. Pietro;S. Divekar;Z. Doležal;D. Dutta;F. Forti;M. Friedl;K. Hara;T. Higuchi;T. Horiguchi;C. Irmler;A. Ishikawa;C. Joo;J. Kandra;K. Kang;E. Kato;T. Kawasaki;P. Kodyš;T. Kohriki;S. Koike;P. Kvasnička;L. Lanceri;J. Lettenbicher;T. Lueck;M. Maki;P. Mammini;S. Mayekar;G. Mohanty;S. Mohanty;T. Morii;Z. Natkaniec;K. Negishi;N. Nisar;Y. Onuki;W. Ostrowicz;A. Paladino;E. Paoloni;H. Park;F. Pilo;A. Profeti;I. Rashevskaya;G. Rizzo;M. Rozanska;J. Sasaki;N. Sato;S. Schultschik;C. Schwanda;Y. Seino;N. Shimizu;J. Stypuła;J. Suzuki;S. Tanaka;K. Tanida;G. Taylor;R. Thalmeier;R. Thomas;T. Tsuboyama;S. Uozumi;P. Urquijo;J. Wiechczynski;S. Williams;B. Würkner;H. Yamamoto;L. Zani

2019年，Belle II实验开始在Y(4S)共振的非对称SuperKEKB对撞机(KEK，日本)上采集数据。Belle II将通过收集50ab−1的积分光度来寻找超出标准模型的新物理。硅顶点探测器由四层双面硅条传感器组成，是两个顶点子探测器之一。SVD以足够的精度将轨道外推到内部像素检测器(PXD)，以正确识别属于该轨道的PXD中的命中。此外，奇异值分解具有独立的跟踪能力，并利用电离来增强低动量区域的粒子识别。尽管SVD暴露在有史以来建造的最高峰值光度对撞机的恶劣光束背景下，但它运行可靠，效率高。测量了高信噪比和命中效率，以及空间分辨率；所有这些量都显示出随时间的良好稳定性。最近，通过对模拟的仔细调整，关于星系团属性的数据模拟一致性得到了改进。可以利用精确的命中时间分辨率来抑制由波束背景引起的超时命中，这将使奇异值分解在较高水平的背景下更加稳健。在运行的头三年中，观察到了辐射损伤对条带噪声、传感器电流和耗尽电压的影响，以及一些由于强烈辐射爆发而导致的耦合电容器故障。所有这些影响都不会导致探测器性能的显著降低。

In 2019 the Belle II experiment started data taking at the asymmetric SuperKEKB collider (KEK, Japan) operating at the Y(4S) resonance. Belle II will search for new physics beyond the standard model by collecting an integrated luminosity of 50 ab−1. The silicon vertex detector (SVD), consisting of four layers of double-sided silicon strip sensors, is one of the two vertex sub-detectors. The SVD extrapolates the tracks to the inner pixel detector (PXD) with enough precision to correctly identify hits in the PXD belonging to the track. In addition the SVD has standalone tracking capability and utilizes ionization to enhance particle identification in the low momentum region. The SVD is operating reliably and with high efficiency, despite exposure to the harsh beam background of the highest peak-luminosity collider ever built. High signal-to-noise ratio and hit efficiency have been measured, as well as the spatial resolution; all these quantities show excellent stability over time. Data-simulation agreement on cluster properties has recently been improved through a careful tuning of the simulation. The precise hit-time resolution can be exploited to reject out-of-time hits induced by beam background, which will make the SVD more robust against higher levels of background. During the first three years of running, radiation damage effects on strip noise, sensor currents and depletion voltage have been observed, as well as some coupling capacitor failure due to intense radiation bursts. None of these effects cause significant degradation in the detector performance.

The silicon vertex detector of the Belle II experiment

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