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Search for a New B-L Z' Gauge Boson with the NA64 Experiment at CERN

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arxiv 2207.09979 v2 pith:NGXEFCP3 submitted 2022-07-20 hep-ex hep-ph

Yu. M. Andreev , D. Banerjee , B. Banto-Oberhauser , J. Bernhard , P. Bisio , M. Bondi , V. Burtsev , A. Celentano
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N. Charitonidis A. G. Chumakov D. Cooke P. Crivelli E. Depero A. V. Dermenev S. V. Donskov R. R. Dusaev T. Enik V. N. Frolov A. Gardikiotis S. G. Gerassimov S. N. Gninenko M. Hosgen M. Jeckel V. A. Kachanov A. E. Karneyeu G. D. Kekelidze B. Ketzer D. V. Kirpichnikov M. M. Kirsanov V. N. Kolosov S. G. Kovalenko V. A. Kramarenko L. V. Kravchuk N. V. Krasnikov S. V. Kuleshov V. E. Lyubovitskij V. Lysan L. Marsicano V. A. Matveev Yu. V. Mikhailov L. Molina Bueno D. V. Peshekhonov V. A. Polyakov B. Radics A. Rubbia K. Salamatin V. D. Samoylenko H. Sieber D. Shchukin O. Soto V. O. Tikhomirov I. Tlisova A. N. Toropin B. I. Vasilishin P. V. Volkov V. Yu. Volkov I. Voronchikhin J. Zamora-Saa
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classification hep-exhep-ph
keywords bosoncerndataexperimentgaugemassna64range
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abstract

A search for a new $Z'$ gauge boson associated with (un)broken B-L symmetry in the keV-GeV mass range is carried out for the first time using the missing-energy technique in the NA64 experiment at the CERN SPS. From the analysis of the data with 3.22e11 electrons on target collected during 2016-2021 runs no signal events were found. This allows to derive new constraints on the $Z'-e$ coupling strength, which for the mass range $0.3 < m_{Z'} < 100$ MeV are more stringent compared to those obtained from the neutrino-electron scattering data.

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