Search for new physics in $e^\pm q$ contact interactions at HERA - INSPIRE

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Search for new physics in $e^\pm q$ contact interactions at HERA

H1

Collaboration

May, 2003

15 pages

Published in:

Phys.Lett.B 568 (2003) 35-47

e-Print:

hep-ex/0305015 [hep-ex]

DOI:

10.1016/j.physletb.2003.06.034

PDG: Indirect Limits for Leptoquarks

Report number:

DESY-03-052

Experiments:

DESY-HERA-H1

View in:

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Abstract:

Deep-inelastic e^\pm p scattering at high squared momentum transfer Q^2 up to 30000 GeV^2 is used to search for eq contact interactions associated to scales far beyond the HERA centre of mass energy. The neutral current cross section measurements d sigma / d Q^2, corresponding to integrated luminosities of 16.4 pb^-1 of e^- p data and 100.8 pb^-1 of e^+ p data, are well described by the Standard Model and are analysed to set constraints on new phenomena. For conventional contact interactions lower limits are set on compositeness scales Lambda ranging between 1.6 - 5.5 TeV. Couplings and masses of leptoquarks and squarks in R-parity violating supersymmetry are constrained to M / lambda > 0.3 - 1.4 TeV. A search for low scale quantum gravity effects in models with large extra dimensions provides limits on the effective Planck scale of M_S > 0.8 TeV. A form factor analysis yields a bound on the radius of light quarks of R_q < 1.0 x 10^-18 m.

Note:

15 pages, 5 figures and 5 tables Report-no: DESY-03-052

electron positron: colliding beams
electron p: colliding beams
lepton p: deep inelastic scattering
new interaction: search for
electron quark: four-fermion interaction
neutral current
differential cross section: momentum transfer
fermion: composite
leptoquark: mass
leptoquark: coupling

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