• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >An improved limit on the charge of antihydrogen from stochastic acceleration
【24h】

An improved limit on the charge of antihydrogen from stochastic acceleration

机译：随机加速产生的抗氢电荷的改进限制

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Antimatter continues to intrigue physicists because of its apparent absence in the observable Universe. Current theory requires that matter and antimatter appeared in equal quantities after the Big Bang, but the Standard Model of particle physics offers no quantitative explanation for the apparent disappearance of half the Universe. It has recently become possible to study trapped atoms(1-4) of antihydrogen to search for possible, as yet unobserved, differences in the physical behaviour of matter and antimatter. Here we consider the charge neutrality of the antihydrogen atom. By applying stochastic acceleration to trapped antihydrogen atoms, we determine an experimental bound on the antihydrogen charge, Qe, of vertical bar Q vertical bar < 0.71 parts per billion (one standard deviation), in which e is the elementary charge. This bound is a factor of 20 less than that determined from the best previous measurement(5) of the antihydrogen charge. The electrical charge of atoms and molecules of normal matter is known(6) to be no greater than about 10(-21)e for a diverse range of species including H-2, He and SF6. Charge-parity-time symmetry and quantum anomaly cancellation(7) demand that the charge of antihydrogen be similarly small. Thus, our measurement constitutes an improved limit and a test of fundamental aspects of the Standard Model. If we assume charge superposition and use the best measured value of the antiproton charge(8), then we can place a new limit on the positron charge anomaly (the relative difference between the positron and elementary charge) of about one part per billion (one standard deviation), a 25-fold reduction compared to the current best measurement(8),(9).
机译：由于反物质在可观察到的宇宙中显然不存在，因此继续引起物理学家的兴趣。当前的理论要求物质和反物质在大爆炸之后出现的数量相等，但是粒子物理学的标准模型没有为宇宙的一半消失提供定量的解释。最近，研究被困的氢原子（1-4）以寻找可能和尚未观察到的物质和反物质的物理行为差异成为可能。这里我们考虑抗氢原子的电荷中性。通过对捕获的反氢原子施加随机加速度，我们确定了竖线Q竖线<十亿分之一0.71分量（一个标准偏差）的反氢电荷Qe的实验范围，其中e是元素电荷。该界限比抗氢电荷的最佳先前测量结果（5）确定的界限小20倍。已知原子和正常物质分子的电荷对于包括H-2，He和SF6在内的各种物种不大于约10（-21）e。电荷奇偶时间对称性和量子异常抵消（7）要求反氢电荷同样小。因此，我们的测量构成了一个改进的极限，并测试了标准模型的基本方面。如果我们假设电荷叠加并使用反质子电荷的最佳测量值（8），则可以对正电子电荷异常（正电子与基本电荷之间的相对差）设置新的限制，大约为十亿分之一（一标准偏差），与目前的最佳测量结果相比减少了25倍（8），（9）。

著录项

  • 来源
    《Nature》 |2016年第7586期|373-376|共4页
  • 作者

    Ahmadi M.; Baquero-Ruiz M.; Bertsche W.; Butler E.; Capra A.; Carruth C.; Cesar C. L.; Charlton M.; Charman A. E.; Eriksson S.; Evans L. T.; Evetts N.; Fajans J.; Friesen T.; Fujiwara M. C.; Gill D. R.; Gutierrez A.; Hangst J. S.; Hardy W. N.; Hayden M. E.; Isaac C. A.; Ishida A.; Jones S. A.; Jonsell S.; Kurchaninov L.; Madsen N.; Maxwell D.; McKenna J. T. K.; Menary S.; Michan J. M.; Momose T.; Munich J. J.; Nolan P.; Olchanski K.; Olin A.; Povilus A.; Pusa P.; Rasmussen C. O.; Robicheaux F.; Sacramento R. L.; Sameed M.; Sarid E.; Silveira D. M.; So C.; Tharp T. D.; Thompson R. I.; van der Werf D. P.; Wurtele J. S.; Zhmoginov A. I.;

  • 作者单位

    Univ Liverpool, Dept Phys, Liverpool L69 7ZE, Merseyside, England;

    Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA|Ecole Polytech Fed Lausanne, CRPP, CH-1015 Lausanne, Switzerland;

    Univ Manchester, Sch Phys & Astron, Manchester M13 9PL, Lancs, England|Sci Tech Daresbury, Cockcroft Inst, Warrington WA4 4AD, Cheshire, England;

    Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Ctr Cold Matter, London SW7 2AZ, England|European Org Nucl Res CERN, Dept Phys, CH-1211 Geneva 23, Switzerland;

    York Univ, Dept Phys & Astron, Toronto, ON M3J 1P3, Canada;

    Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA;

    Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, Brazil;

    Swansea Univ, Dept Phys, Swansea SA2 8PP, W Glam, Wales;

    Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA;

    Swansea Univ, Dept Phys, Swansea SA2 8PP, W Glam, Wales;

    Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA;

    Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z4, Canada;

    Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA;

    Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark;

    TRIUMF, Vancouver, BC V6T 2A3, Canada;

    TRIUMF, Vancouver, BC V6T 2A3, Canada;

    Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z4, Canada;

    Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark;

    Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z4, Canada;

    Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada;

    Swansea Univ, Dept Phys, Swansea SA2 8PP, W Glam, Wales;

    European Org Nucl Res CERN, Dept Phys, CH-1211 Geneva 23, Switzerland;

    Swansea Univ, Dept Phys, Swansea SA2 8PP, W Glam, Wales;

    Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden;

    TRIUMF, Vancouver, BC V6T 2A3, Canada;

    Swansea Univ, Dept Phys, Swansea SA2 8PP, W Glam, Wales;

    Swansea Univ, Dept Phys, Swansea SA2 8PP, W Glam, Wales;

    TRIUMF, Vancouver, BC V6T 2A3, Canada;

    York Univ, Dept Phys & Astron, Toronto, ON M3J 1P3, Canada;

    TRIUMF, Vancouver, BC V6T 2A3, Canada;

    Univ British Columbia, Dept Chem, Vancouver, BC V6T 1Z1, Canada;

    Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada;

    Univ Liverpool, Dept Phys, Liverpool L69 7ZE, Merseyside, England;

    TRIUMF, Vancouver, BC V6T 2A3, Canada;

    TRIUMF, Vancouver, BC V6T 2A3, Canada|Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 5C2, Canada;

    Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA;

    Univ Liverpool, Dept Phys, Liverpool L69 7ZE, Merseyside, England;

    Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark;

    Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA;

    Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, Brazil;

    Swansea Univ, Dept Phys, Swansea SA2 8PP, W Glam, Wales;

    Soreq Nucl Res Ctr, IL-81800 Yavne, Israel;

    Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, Brazil;

    Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA;

    Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark;

    Univ Calgary, Dept Phys & Astron, Calgary, AB T2N 1N4, Canada;

    Swansea Univ, Dept Phys, Swansea SA2 8PP, W Glam, Wales;

    Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA|Univ Calif Berkeley, Lawrence Berkeley Natl Lab, ATAP, Berkeley, CA 94720 USA;

    Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号