Single SbottomScharm Production at HERA in an R-Parity Breaking Supersymmetric Model.pdf

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Single SbottomScharm Production at HERA in an R-Parity Breaking Supersymmetric Model.pdf

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Single SbottomScharm Production at HERA in an R-Parity Breaking Supersymmetric Model

a r X i v : h e p - p h / 0 0 0 7 2 0 0 v 2 2 2 J u l 2 0 0 0 AP-SU-00/01 hep-ph/0007200 July, 2000 Single Sbottom/Scharm Production at HERA in an R-Parity Breaking Supersymmetric Model Tadashi Kon Faculty of Engineering, Seikei University, Tokyo 180-8633, Japan kon@apm.seikei.ac.jp Tetsuro Kobayashi Faculty of Engineering, Fukui Institute of Technology, Fukui 910-8505, Japan koba@ge.seikei.ac.jp Shoichi Kitamura Tokyo Metropolitan University of Health Sciences, Tokyo 116-8551, Japan kitamura@post.metro-hs.ac.jp Takashi Iimura Faculty of Engineering, Seikei University, Tokyo 180-8633, Japan iimura@dirac.ap.seikei.ac.jp Abstract We investigate the production process of the single scalar bottom quark (sbottom) and scalar charm quark (scharm) at HERA. The sbottom and scharm could be produced via an R-parity breaking interactions λ′123 6= 0 in the Minimal Supersymmetric Standard Model (MSSM). These pro- cesses give a slight excess in the invariant mass Meq distribution of the high Q2 deep inelastic scattering for sufficiently heavy gauginos and the scalar top (stop). For the light gauginos and stop, it is shown that the tagging of b/c-quarks and charged leptons with high transverse energies will be indispensable to search for the processes. 1 1 Introduction The HERA accelerator is the only existing electron ? – proton collider with the center of mass energy of 300GeV (318GeV since 1998) produced by 27.5GeV electrons and 820GeV (920GeV since 1998) protons [1]. The luminosity has steadily increased and the integrated luminosity of e+p collisions during 1994 – 1997 has reached 36.5pb?1 and 47.7pb?1 for H1 and ZEUS, respectively. One of the most attractive features of the HERA is to provide a unique possibility to search for new phenomena revealing the physics beyond the standard model (SM) through rare topologies in the final states characteristic to electron – proton collisions. In this paper we investigate a single scalar bottom quark (sbottom) and a scalar charm qu