LHCb探测器在LHC上的绝对亮度测量
高能物理 - 实验
2012-01-12 v2 仪器与探测器
摘要
绝对亮度测量对存储环上的对撞束流实验具有普遍意义。这些测量对于确定反应过程的绝对截面是必要的，且对评估加速器性能具有重要价值。利用2010年采集的数据，LHCb应用两种方法确定了其在LHC上质子-质子碰撞（质心能量7 TeV）亮度测量的绝对标度。除经典的"van der Meer scan"方法外，还开发了一种新技术，利用束流-气体和束流-束流相互作用对单个束流进行直接成像。该束流成像方法得益于LHCb顶点探测器的高分辨率及其与束流的近距离，能够确定束流的位置、角度和宽度等参数。两种方法的结果具有可比的精度且吻合良好。结合两种方法，绝对亮度测定的总体精度达到3.5%。本文还 presenting 了将绝对亮度标度传递至2010年全部数据获取时段所采用的技术。
引用
@article{arxiv.1110.2866,
title = {Absolute luminosity measurements with the LHCb detector at the LHC},
author = {The LHCb Collaboration and R. Aaij and B. Adeva and M. Adinolfi and C. Adrover and A. Affolder and Z. Ajaltouni and J. Albrecht and F. Alessio and M. Alexander and G. Alkhazov and P. Alvarez Cartelle and A. A. Alves and S. Amato and Y. Amhis and J. Anderson and R. B. Appleby and O. Aquines Gutierrez and F. Archilli and L. Arrabito and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and S. Bachmann and J. J. Back and D. S. Bailey and V. Balagura and W. Baldini and R. J. Barlow and C. Barschel and S. Barsuk and W. Barter and A. Bates and C. Bauer and Th. Bauer and A. Bay and I. Bediaga and K. Belous and I. Belyaev and E. Ben-Haim and M. Benayoun and G. Bencivenni and S. Benson and J. Benton and R. Bernet and M. -O. Bettler and M. van Beuzekom and A. Bien and S. Bifani and A. Bizzeti and P. M. Bjørnstad and T. Blake and F. Blanc and C. Blanks and J. Blouw and S. Blusk and A. Bobrov and V. Bocci and A. Bondar and N. Bondar and W. Bonivento and S. Borghi and A. 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journal= {arXiv preprint arXiv:1110.2866},
year = {2012}
}
备注
48 pages, 19 figures. Results unchanged, improved clarity of Table 6, 9 and 10 and corresponding explanation in the text