Dr Jim Brooke

Summary

I am using the CMS detector at the CERN LHC to search for new physics at the energy frontier.  In particular, I am interested in exotic long lived particles that produce strange signatures in the detector, and may go unnoticed by orthodox searches.  I lead the CMS physics working group in this area.  Our recent results include searches for neutral particles that decay to leptons within the CMS detector, long lived particles that decay to photons, and massive slow moving particles.  With the early LHC data, I pioneered a search for particles that become stuck in the detector and decay later.  Unfortunately this search did not discover any new physics, but did allow us to place some of the first limits on new physics from the LHC.  I am also developing methods for measuring the properties of a Higgs boson, should we discover it, that will tell us whether we have found a Standard Model Higgs, or some more exotic version.  In particular, I am interested in measuring the coupling of the Higgs to invisible particles, such as Dark Matter.

A major challenge of the LHC is the online "Trigger" system, that selects events of interest in real time, to keep the data rate out of the detector to a manageable level.  I developed algorithms, hardware and software for the CMS Level 1 trigger, and then commissioned it before and during LHC startup.  However, future upgrades of the LHC will place increasing demands on the existing trigger system, so I am collaborating with other CMS members from the UK on the next generation of trigger systems.

Keywords

• CMS
• Hadron Collider

Memberships

Organisations

School of Physics

Physics staff

• Physics research staff

Research groups

• Particle Physics

Links

•   My page at CERN

Selected publications

• et, aCC(K, Bostock, F, Brooke, J, Cheng, T, Clement, E, Cussans, D, Frazier, R, Goldstein, J, Grimes, M, Hartley, D, Heath, G, Heath, H, Huckvale, B, Jackson, J, Kreczko, L, Metson, S, Newbold, D, Nirunpong, K, Poll, T, Senkin, S & Smith, V 2011, ‘Search for Stopped Gluinos in pp collisions at sqrt s = 7 TeV’. Physical Review Letters, vol 106., pp. 1 - 15
• et, aCC(K, Bostock, F, Brooke, J, Cheng, T, Clement, E, Cussans, D, Frazier, R, Goldstein, J, Grimes, M, Hansen, M, Hartley, D, Heath, G, Heath, H, Huckvale, B, Jackson, J, Kreczko, L, Metson, S, Newbold, D, Nirunpong, K, Poll, T, Senkin, S & Smith, V 2011, ‘Search for Heavy Stable Charged Particles in pp collisions at sqrt(s)=7 TeV’. Journal of High Energy Physics, vol 1103., pp. 024
• et, aCC(C, Bostock, F, Brooke, J, Cheng, T, Cussans, D, Frazier, R, Goldstein, J, Grant, N, Heath, G, Heath, H, Hill, C, Huckvale, B, Jackson, J, Mackay, C, Metson, S, Newbold, D, Nirunpong, K, Smith, V & Velthuis, J 2010, ‘Performance of the CMS Level-1 Trigger during Commissioning with Cosmic Ray Muons’. Journal of Instrumentation, vol 5.
• Brooke, J, Frazier, R, Hansen, M & Heath, G 2010, ‘Performance of the CMS global calorimeter trigger’. Nuclear Instruments and Methods A, vol 623., pp. 546 - 548

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Recent publications

• Heath, GP, Bostock, FJD, Brooke, JJ, Clement, EJ, Cussans, DG, Flaecher, HU, Frazier, RJE, Goldstein, J, Grimes, MA, Heath, HF, Kreczko, L, Metson, S, Newbold, DM, Nirunpong, K, Poll, T, Senkin, S, Smith, VJ, Williams, TS, (Chatrchyan, aCC, S & et 2012, ‘Search for stopped long-lived particles produced in pp collisions at √ s =7 TeV.’. Journal of High Energy Physics, vol 2012., pp. 026
• et, aCC(C, Bostock, F, Brooke, J, Cheng, T, Clement, E, Cussans, D, Frazier, R, Goldstein, J, Grimes, M, Hansen, M, Hartley, D, Heath, G, Heath, H, Kreczko, L, Metson, S, Newbold, D, Nirunpong, K, Poll, T, Senkin, S & Smith, V 2011, ‘Measurement of the Top-antitop Production Cross Section in pp Collisions at sqrt(s)=7 TeV using the Kinematic Properties of Events with Leptons and Jets’. The European Physical Journal C, vol C71., pp. 1721
• et, aCC(C, Bostock, F, Brooke, J, Cheng, T, Clement, E, Cussans, D, Frazier, R, Goldstein, J, Grimes, M, Hartley, D, Heath, G, Heath, H, Kreczko, L, Metson, S, Newbold, D, Nirunpong, K, Poll, T, Senkin, S & Smith, V 2011, ‘Measurement of the t-channel single top quark production cross section in pp collisions at sqrt(s) = 7 TeV’. Physical Review Letters, vol 107., pp. 091802
• et, aCC(K, Bostock, F, Brooke, J, Cheng, T, Cussans, D, Frazier, R, Goldstein, J, Grimes, M, Hansen, M, Heath, G, Heath, H, Huckvale, B, Jackson, J, Kreczko, L, Metson, S, Newbold, D, Nirunpong, K, Poll, T & Smith, V 2011, ‘First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at sqrt(s)=7 TeV’. Physics Letters B, vol B695., pp. 424 - 443
• (Chatrchyan, aCC, S, et, Bostock, F, Brooke, J, Cheng, T, Clement, E, Cussans, D, Frazier, R, Goldstein, J, Grimes, M, Hartley, D, Heath, G, Heath, H, Kreczko, L, Metson, S, Newbold, D, Nirunpong, K, Poll, T, Senkin, S & Smith, V 2011, ‘Measurement of the Differential Cross Section for Isolated Prompt Photon Production in pp Collisions at 7 TeV’. Physical Review D, vol D84., pp. 052011
• et, aCC(C, Bostock, F, Brooke, J, Cheng, T, Clement, E, Cussans, D, Frazier, R, Goldstein, J, Grimes, M, Hartley, D, Heath, G, Heath, H, Kreczko, L, Metson, S, Newbold, D, Nirunpong, K, Poll, T, Senkin, S & Smith, V 2011, ‘Measurement of the Drell-Yan Cross Section in pp Collisions at sqrt(s) = 7 TeV’. Journal of High Energy Physics, vol 10(2011)., pp. 007

View complete publications list in the University of Bristol publications system