Multiphoton signal in supersymmetry comprising nonpointing photon(s) at the LHC

Journal Article · Fri Apr 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.075009· OSTI ID:21537745

Biswas, Sanjoy; Chakrabortty, Joydeep ^[1]; Roy, Sourov ^[2]

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1. Harish-Chandra Research Institute, Chhatnag Road, Jhunsi, Allahabad-211019 (India)
2. Department of Theoretical Physics and Centre for Theoretical Sciences, Indian Association for the Cultivation of Science, 2A and 2B Raja S.C. Mullick Road, Kolkata-700032 (India)

We study a distinct supersymmetric signal of multiphotons in association with jets and missing transverse energy. At least one of these photons has the origin in displaced vertex, and thus it is delayed and nonpointing. We consider a supersymmetric scenario in which the gravitino is the lightest supersymmetric particle (LSP) (with a mass {approx}1 keV) and the lightest neutralino is the next-to-lightest supersymmetric particle (NLSP). The NLSP decays dominantly into a photon and a gravitino within the detector with a decay length ranging from c{tau}{sub {tilde {chi}}} {approx}50-100 cm. In addition, we assume that the second-lightest neutralino and the lightest neutralino are nearly degenerate and this leads to a prompt radiative decay of the next-to-lightest neutralino into a photon and a lightest neutralino with a large branching ratio. Such degenerate neutralinos can be realized in various representations of the SU(5), SO(10) and E(6) GUT group. The nonpointing photons can be reconstructed at the electromagnetic calorimeter of the ATLAS detector, which have been designed with good timing and directional resolution. We find that with a center-of-mass energy E{sub cm}=14 TeV at an integrated luminosity of 100 fb{sup -1} one may see evidence of hundreds of triphoton events at the LHC, in addition to several thousands diphoton events. We also predict the event rates even at the early phase of LHC run.

• OSTI ID: 21537745
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 7; Other Information: DOI: 10.1103/PhysRevD.83.075009; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
CALORIMETERS
CERN LHC
LUMINOSITY
MASS
MULTI-PHOTON PROCESSES
PHOTONS
RADIATIVE DECAY
RESOLUTION
SO-10 GROUPS
SPARTICLES
SU-5 GROUPS
SUPERSYMMETRY
TEV RANGE 10-100
TRANSVERSE ENERGY
ACCELERATORS
BOSONS
CYCLIC ACCELERATORS
DECAY
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
KINETIC ENERGY
LIE GROUPS
MASSLESS PARTICLES
MEASURING INSTRUMENTS
OPTICAL PROPERTIES
PARTICLE DECAY
PHYSICAL PROPERTIES
POSTULATED PARTICLES
SO GROUPS
STORAGE RINGS
SU GROUPS
SYMMETRY
SYMMETRY GROUPS
SYNCHROTRONS
TEV RANGE