Limits on contact interactions and leptoquarks at HERA

The ZEUS collaboration

doi:10.1103/PhysRevD.99.092006

Limits on contact interactions and leptoquarks at HERA

The ZEUS collaboration

Department of Particle Physics and Astrophysics

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

High-precision HERA data corresponding to a luminosity of around 1fb−1 have been used in the framework of eeqq contact interactions (CI) to set limits on possible high-energy contributions beyond the Standard Model to electron-quark scattering. Measurements of the inclusive deep inelastic cross sections in neutral and charged current ep scattering were considered. The analysis of the ep data has been based on simultaneous fits of parton distribution functions including contributions of CI couplings to ep scattering. Several general CI models and scenarios with heavy leptoquarks were considered. Improvements in the description of the inclusive HERA data were obtained for a few models. Since a statistically significant deviation from the Standard Model cannot be established, limits in the TeV range were set on all models considered.

Original language	English
Article number	092006
Number of pages	12
Journal	Physical Review D
Volume	99
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevD.99.092006
Publication status	Published - 29 May 2019

Funding

We appreciate the contributions to the construction, maintenance and operation of the ZEUS detector of many people who are not listed as authors. The HERA machine group and the DESY computing staff are especially acknowledged for their success in providing excellent operation of the collider and the data-analysis environment. We thank the DESY directorate for their strong support and encouragement. This work was supported by the Italian National Institute for Nuclear Physics (INFN), the German Federal Ministry for Education and Research (BMBF), under Contracts No. 05 H09PDF, HIR Grant No. UM.C/625/1/HIR/149 and UMRG Grants No. RU006-2013, No. RP012A-13AFR and No. RP012B-13AFR from Universiti Malaya, and ERGS Grant No. ER004-2012A from the Ministry of Education, Malaysia, the Science and Technology Facilities Council, UK, the German Federal Ministry for Education and Research (BMBF), under Contract No. 05h09GUF, and the SFB 676 of the Deutsche Forschungsgemeinschaft (DFG), the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and its grants for Scientific Research, by the Israel Science Foundation, and by the Natural Sciences and Engineering Research Council of Canada (NSERC). This work was partially supported by RF Presidential Grant No. NSh-7989.2016.2 and in part by the Office of Nuclear Physics within the U.S. DOE Office of Science. W. S. was supported by the Polish National Science Centre (NCN) Grant No. DEC-2014/13/B/ST2/02486. Funded by SCOAP

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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title = "Limits on contact interactions and leptoquarks at HERA",

abstract = "High-precision HERA data corresponding to a luminosity of around 1fb−1 have been used in the framework of eeqq contact interactions (CI) to set limits on possible high-energy contributions beyond the Standard Model to electron-quark scattering. Measurements of the inclusive deep inelastic cross sections in neutral and charged current ep scattering were considered. The analysis of the ep data has been based on simultaneous fits of parton distribution functions including contributions of CI couplings to ep scattering. Several general CI models and scenarios with heavy leptoquarks were considered. Improvements in the description of the inclusive HERA data were obtained for a few models. Since a statistically significant deviation from the Standard Model cannot be established, limits in the TeV range were set on all models considered.",

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AB - High-precision HERA data corresponding to a luminosity of around 1fb−1 have been used in the framework of eeqq contact interactions (CI) to set limits on possible high-energy contributions beyond the Standard Model to electron-quark scattering. Measurements of the inclusive deep inelastic cross sections in neutral and charged current ep scattering were considered. The analysis of the ep data has been based on simultaneous fits of parton distribution functions including contributions of CI couplings to ep scattering. Several general CI models and scenarios with heavy leptoquarks were considered. Improvements in the description of the inclusive HERA data were obtained for a few models. Since a statistically significant deviation from the Standard Model cannot be established, limits in the TeV range were set on all models considered.

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Limits on contact interactions and leptoquarks at HERA

Abstract

Funding

All Science Journal Classification (ASJC) codes

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