Acharya B, Alexandre J, Behera S C, Benes P, Bergmann B, Bertolucci S, Bevan A, Brancaccio R, Branzas H, Burian P, Campbell M, Cecchini S, Cho Y M, de Montigny M, De Roeck A, Ellis J R, Fairbairn M, Felea D, Frank M, Gould O, Hays J, Hirt A M, Ho D L-J, Hung P Q, Janecek J, Kalliokoski M, Lacarrère D H, Leroy C, Levi G, Margiotta A, Maselek R, Maulik A, Mauri N, Mavromatos N E, Millward L, Mitsou V A, Musumeci E, Ostrovskiy I, Ouimet P-P, Papavassiliou J, Patrizii L, Păvălaş G E, Pinfold J L, Popa L A, Popa V, Pozzato M, Pospisil S, Rajantie A, Ruiz de Austri R, Sahnoun Z, Sakellariadou M, Sakurai K, Sarkar S, Semenoff G, Shaa A, Sirri G, Sliwa K, Soluk R, Spurio M, Staelens M, Suk M, Tenti M, Togo V, Tuszyński J A, Upreti A, Vento V, Vives O
Theoretical Particle Physics & Cosmology Group, Physics Department, King's College, London, United Kingdom.
Department of Physics and Astronomy, <a href="https://ror.org/03xrrjk67">University of Alabama</a>, Tuscaloosa, Alabama, USA.
Phys Rev Lett. 2024 Aug 16;133(7):071803. doi: 10.1103/PhysRevLett.133.071803.
We report on a search for magnetic monopoles (MMs) produced in ultraperipheral Pb-Pb collisions during Run 1 of the LHC. The beam pipe surrounding the interaction region of the CMS experiment was exposed to 184.07 μb^{-1} of Pb-Pb collisions at 2.76 TeV center-of-mass energy per collision in December 2011, before being removed in 2013. It was scanned by the MoEDAL experiment using a SQUID magnetometer to search for trapped MMs. No MM signal was observed. The two distinctive features of this search are the use of a trapping volume very close to the collision point and ultrahigh magnetic fields generated during the heavy-ion run that could produce MMs via the Schwinger effect. These two advantages allowed setting the first reliable, world-leading mass limits on MMs with high magnetic charge. In particular, the established limits are the strongest available in the range between 2 and 45 Dirac units, excluding MMs with masses of up to 80 GeV at a 95% confidence level.
我们报告了在大型强子对撞机（LHC）运行1期间，对超外围铅-铅碰撞中产生的磁单极子（MMs）的搜索情况。CMS实验相互作用区域周围的束流管道，在2011年12月，每碰撞一次质心能量为2.76 TeV的情况下，暴露于184.07 μb⁻¹的铅-铅碰撞中，然后在2013年被移除。MoEDAL实验使用超导量子干涉装置（SQUID）磁力计对其进行扫描，以寻找捕获的磁单极子。未观察到磁单极子信号。此次搜索的两个显著特点是使用了非常靠近碰撞点的捕获体积，以及重离子运行期间产生的超高磁场，该磁场可通过施温格效应产生磁单极子。这两个优势使得能够为高磁荷磁单极子设定首个可靠的、世界领先的质量限制。特别是，在2到45狄拉克单位的范围内，已确立的限制是最强的，在95%置信水平下排除了质量高达80 GeV的磁单极子。
