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**1 - 1**of**1**### Stops in R-parity Breaking Model for High-Q 2 Events at HERA

, 1997

"... We investigate an event excess in the reaction e + p → e + X with large x and high Q 2 observed at HERA and show that the events could naturally be interpreted as a signature of the production of the scalar top quarks (stops) in a supersymmetric model with R-parity breaking interactions. The HERA ev ..."

Abstract
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We investigate an event excess in the reaction e + p → e + X with large x and high Q 2 observed at HERA and show that the events could naturally be interpreted as a signature of the production of the scalar top quarks (stops) in a supersymmetric model with R-parity breaking interactions. The HERA events are characterized by the broad mass distribution and in fact it can be simulated by our specific scenario if we consider almost degenerate two mass eigenstates ˜t1 and ˜t2 of the stops. 1 Recently both the H1 and ZEUS Collaboration reported that an event excess in the deep inelastic scattering (DIS) e + p → e + X with large x and high Q 2 had been observed [1, 2] at HERA. The total data sample analyzed at the H1 and ZEUS corresponds to respectively accumulated luminosity of 14.2pb −1 and 20.1pb −1 in positron (27.5GeV) – proton (820GeV) collisions. For high Q 2 (> 15,000GeV 2) region 12 events are observed at both the H1 and ZEUS, while the Standard Model expectation are 4.7 ± 0.8 and 8.7 ± 0.7, respectively. Combining these results we get Nobs = 24 (σobs ≃ 0.71pb) against Nexp