Search for a light Higgs boson in central exclusive diffraction: method and detectors: Dissertation

Juha Kalliopuska

Research output: ThesisDissertationCollection of Articles


By detecting leading protons produced in the Central Exclusive Diffractive process, p+p [arrowright] p+X+p, one can measure the missing mass, and scan for possible new particle states such as the Higgs boson. This process augments - in a model independent way - the standard methods for new particle searches at the Large Hadron Collider (LHC) and will allow detailed analyses of the produced central system, such as the spin-parity properties of the Higgs boson. The exclusive central diffractive process makes possible precision studies of gluons at the LHC and complements the physics scenarios foreseen at the next e+e- linear collider. This thesis first presents the conclusions of the first systematic analysis of the expected precision measurement of the leading proton momentum and the accuracy of the reconstructed missing mass. In this initial analysis, the scattered protons are tracked along the LHC beam line and the uncertainties expected in beam transport and detection of the scattered leading protons are accounted for. The main focus of the thesis is in developing the necessary radiation hard precision detector technology for coping with the extremely demanding experimental environment of the LHC. This will be achieved by using a 3D silicon detector design, which in addition to the radiation hardness of up to 5x10^15 neutrons/cm2, offers properties such as a high signal-to- noise ratio, fast signal response to radiation and sensitivity close to the very edge of the detector. This work reports on the development of a novel semi-3D detector design that simplifies the 3D fabrication process, but conserves the necessary properties of the 3D detector design required in the LHC and in other imaging applications.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • University of Helsinki
Place of PublicationHelsinki
Print ISBNs978-952-10-3243-1
Electronic ISBNs978-952-10-3244-8
Publication statusPublished - 2007
MoE publication typeG5 Doctoral dissertation (article)


  • Higgs boson
  • central exclusice diffraction
  • missing mass method
  • silicon radiation detector
  • 3D detector
  • semi-3D detector
  • radiation hardness
  • TCAD simulation


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