N Jettiness: An Inclusive Event Shape to Veto Jets
- Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
Jet vetoes are essential in many analyses at the LHC and Tevatron. Typical signals have a specific number of hard jets or leptons, while backgrounds have additional jets. Vetoing undesired jets efficiently discriminates signal and background. For a sample with {>=}N jets, the veto to give N energetic jets defines an 'exclusive' N-jet cross section. This strongly restricts the phase space and causes large double logarithms in perturbation theory that must be summed. Jet vetoes are typically implemented using jet algorithms, yielding complicated phase-space restrictions, and reliance on leading-log parton-shower Monte Carlo simulations. We introduce a global event shape 'N jettiness' {tau}{sub N}, which is defined for events with N signal jets. Requiring {tau}{sub N}<<1 constrains radiation between the signal jets and provides a theoretically well-controlled jet veto. N jettiness yields a factorization formula with inclusive jet and beam functions.
- OSTI ID:
- 21470989
- Journal Information:
- Physical Review Letters, Vol. 105, Issue 9; Other Information: DOI: 10.1103/PhysRevLett.105.092002; (c) 2010 American Institute of Physics; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALGORITHMS
CERN LHC
COMPUTERIZED SIMULATION
CROSS SECTIONS
EXCLUSIVE INTERACTIONS
FACTORIZATION
FERMILAB TEVATRON
GLUONS
INCLUSIVE INTERACTIONS
JET MODEL
LEPTONS
MONTE CARLO METHOD
PARTICLE DISCRIMINATION
PERTURBATION THEORY
PHASE SPACE
QUARKS
ACCELERATORS
BOSONS
CALCULATION METHODS
CYCLIC ACCELERATORS
ELEMENTARY PARTICLES
FERMIONS
INTERACTIONS
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MATHEMATICAL SPACE
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PARTICLE MODELS
SIMULATION
SPACE
STORAGE RINGS
SYNCHROTRONS