Search for magnetic monopoles with the MoEDAL prototype trapping detector in 8 TeV proton-proton collisions at the LHC

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作者
B. Acharya
J. Alexandre
K. Bendtz
P. Benes
J. Bernabéu
M. Campbell
S. Cecchini
J. Chwastowski
A. Chatterjee
M. de Montigny
D. Derendarz
A. De Roeck
J. R. Ellis
M. Fairbairn
D. Felea
M. Frank
D. Frekers
C. Garcia
G. Giacomelli
D. Hasegan
M. Kalliokoski
A. Katre
D.-W. Kim
M. G. L. King
K. Kinoshita
D.H. Lacarrère
S. C. Lee
C. Leroy
A. Lionti
A. Margiotta
N. Mauri
N. E. Mavromatos
P. Mermod
D. Milstead
V. A. Mitsou
R. Orava
B. Parker
L. Pasqualini
L. Patrizii
G. E. Păvălas
J. L. Pinfold
M. Platkevič
V. Popa
M. Pozzato
S. Pospisil
A. Rajantie
Z. Sahnoun
M. Sakellariadou
S. Sarkar
G. Semenoff
机构
[1] King’s College London,Theoretical Particle Physics & Cosmology Group, Physics Dept.
[2] International Centre for Theoretical Physics,INFN, section of Bologna & Department of Physics & Astronomy
[3] IFIC,Physics Department
[4] Universitat de València — CSIC,Department of Physics
[5] Experimental Physics Department,Département de physique
[6] CERN,Physics Department
[7] Theoretical Physics Department,Section de Physique
[8] CERN,Physics Department
[9] Beams Department,Physics Department
[10] CERN,Physics Department
[11] University of Bologna,Department of Physics
[12] Institute of Nuclear Physics Polish Academy of Sciences,Department of Physics
[13] University of Alberta,Department of Physics and Astronomy
[14] Institute of Space Science,Physics Department
[15] Concordia University,Physics Department
[16] Université de Montréal,Physics Department
[17] University of Muenster,undefined
[18] IEAP,undefined
[19] Czech Technical University in Prague,undefined
[20] Université de Genève,undefined
[21] Gangneung-Wonju National University,undefined
[22] University of Cincinnati,undefined
[23] University of Helsinki,undefined
[24] Imperial College London,undefined
[25] Centre for Astronomy,undefined
[26] Astrophysics and Geophysics,undefined
[27] University of British Columbia,undefined
[28] Tufts University,undefined
[29] Northeastern University,undefined
[30] Konkuk University,undefined
[31] Stockholm University,undefined
[32] INFN,undefined
[33] section of Bologna,undefined
[34] INFN,undefined
[35] CNAF,undefined
[36] The Institute for Research in Schools,undefined
[37] Queen Mary University of London,undefined
关键词
Exotics; Hadron-Hadron scattering (experiments); Particle and resonance production;
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摘要
The MoEDAL experiment is designed to search for magnetic monopoles and other highly-ionising particles produced in high-energy collisions at the LHC. The largely passive MoEDAL detector, deployed at Interaction Point 8 on the LHC ring, relies on two dedicated direct detection techniques. The first technique is based on stacks of nucleartrack detectors with surface area ~18m2, sensitive to particle ionisation exceeding a high threshold. These detectors are analysed offline by optical scanning microscopes. The second technique is based on the trapping of charged particles in an array of roughly 800 kg of aluminium samples. These samples are monitored offline for the presence of trapped magnetic charge at a remote superconducting magnetometer facility. We present here the results of a search for magnetic monopoles using a 160 kg prototype MoEDAL trapping detector exposed to 8TeV proton-proton collisions at the LHC, for an integrated luminosity of 0.75 fb–1. No magnetic charge exceeding 0:5gD (where gD is the Dirac magnetic charge) is measured in any of the exposed samples, allowing limits to be placed on monopole production in the mass range 100 GeV≤ m ≤ 3500 GeV. Model-independent cross-section limits are presented in fiducial regions of monopole energy and direction for 1gD ≤ |g| ≤ 6gD, and model-dependent cross-section limits are obtained for Drell-Yan pair production of spin-1/2 and spin-0 monopoles for 1gD ≤ |g| ≤ 4gD. Under the assumption of Drell-Yan cross sections, mass limits are derived for |g| = 2gD and |g| = 3gD for the first time at the LHC, surpassing the results from previous collider experiments.
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