학술논문
MoEDAL search in the CMS beam pipe for magnetic monopoles produced via the Schwinger effect
Document Type
Working Paper
Author
Acharya, B.; Alexandre, J.; 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.; Lacarrere, 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.; Pavalas, G. E.; Pinfold, J. L.; Popa, L. A.; Popa, V.; Pozzato, M.; Pospisil, S.; Rajantie, A.; de Austri, R. Ruiz; 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.; Tuszynski, J. A.; Upreti, A.; Vento, V.; Vives, O.
Source
Subject
Language
Abstract
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 174.29 $\mathrm{\mu}$b$^{-1}$ of Pb--Pb collisions at 2.76 TeV center-of-mass energy per collision in December 2011. 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 ultra-high 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 95% confidence level.
Comment: 6 pages, 5 figures
Comment: 6 pages, 5 figures