A search for scalar top quarks in R-parity violating supersymmetry is performed in e+p collisions at HERA using the H1detector. The data, taken at ãs = 319 GeV and 301 GeV, correspond to an integrated luminosity of 106 pb-1. The resonantproduction of scalar top quarks ˜t in positron quark fusion via an R-parity violating Yukawa coupling λ_ is considered with thesubsequent bosonic stop decay ˜t ¨ ˜bW. The R-parity violating decay of the sbottom quark ˜b¨d ¯νe and leptonic and hadronicW decays are considered. No evidence for stop production is found in the search for bosonic stop decays nor in a searchfor the direct R-parity violating decay ˜t ¨eq. Mass dependent limits on λ_ are obtained in the framework of the minimalsupersymmetric Standard Model. Stop quarks with masses up to 275 GeV can be excluded at the 95% confidence level for aYukawa coupling of electromagnetic strength.
Aktas, A., Andreev, V., Anthonis, T., Asmone, A., Stella, B.R. (2004). Search for Bosonic Stop Decays in R-Parity Violating Supersymmetry in e^+p Collisions at HERA. PHYSICS LETTERS, B599, 159-171.
Search for Bosonic Stop Decays in R-Parity Violating Supersymmetry in e^+p Collisions at HERA
STELLA, Bruno Raffaele
2004-01-01
Abstract
A search for scalar top quarks in R-parity violating supersymmetry is performed in e+p collisions at HERA using the H1detector. The data, taken at ãs = 319 GeV and 301 GeV, correspond to an integrated luminosity of 106 pb-1. The resonantproduction of scalar top quarks ˜t in positron quark fusion via an R-parity violating Yukawa coupling λ_ is considered with thesubsequent bosonic stop decay ˜t ¨ ˜bW. The R-parity violating decay of the sbottom quark ˜b¨d ¯νe and leptonic and hadronicW decays are considered. No evidence for stop production is found in the search for bosonic stop decays nor in a searchfor the direct R-parity violating decay ˜t ¨eq. Mass dependent limits on λ_ are obtained in the framework of the minimalsupersymmetric Standard Model. Stop quarks with masses up to 275 GeV can be excluded at the 95% confidence level for aYukawa coupling of electromagnetic strength.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
