3,222 research outputs found

    Mass Resolution Corrections at the LHC

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    The utility of jet spectroscopy at the LHC is compromised by the existence of multiple interactions within a bunch crossing. The energy deposits from these interactions at the design luminosity of the LHC may degrade the dijet mass resolution unless great care is taken. Energy clusters making up the jet can be required to have an energy flow with respect to the jet axis which resembles QCD. In addition, subsidiary information such as the jet mass or the out of jet cone mass or transverse momentum can be deployed so as to alleviate the adverse effects of pileup.Comment: 9 pages, 7 figure

    Welfare and warfare an uneasy mix: personal experiences of and organisational responses to emotional and mental health issues in young ex-service personnel

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    'Shell-shock', which is now known as Post Traumatic Stress Disorder (PTSD), was first identified during the First World War and since this time the mental health of service personnel has been an issue of concern, particularly during times of armed conflict. This is an exploratory piece of research, the purpose of which is to provide information from a range of stakeholders, primarily ex-service personnel but also their families and welfare staff about the mental health needs of young military personnel

    The Physics of Particle Detectors

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    Parthenocissus quinquefolia (L.) Planch.

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    Dijet Mass Resolution at the LHC

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    At the LHC the resolution of dijet mass is compromised by the pile up of energy from overlapping minimum bias events. Using anxillary measurements of the jet mass and the energy in distant cones, the resolution can be improved, as illustrated by a study of Z' of 120 GeV mass with the LHC operating at design luminosity.Comment: 11 pages, 8 figure

    LHC Detector Upgrades

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    The LHC detectors are well into their construction phase. The LHC schedule shows first beam to ATLAS and CMS in 2007. Because the LHC accelerator has begun to plan for a ten fold increase in LHC design luminosity (the SLHC or super LHC) it is none too soon to begin to think about the upgrades which will be required of the present LHC detectors. In particular, the tracking systems of ATLAS and CMS will need to be completely rebuilt. Given the time needed to do the R&D, make prototypes, and construct the new detectors and given the accelerator schedule for the SLHC, work needs to begin rather soon.Comment: 14 pages, 11 figure
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