Sensitivity of the η ( ′ ) → π 0 γ γ and η ′ → η γ γ decays to a sub-GeV leptophobic U ( 1 ) B boson

Escribano, Rafel; Gonzàlez-Solís, Sergi; Royo, Emilio

doi:10.1103/PhysRevD.106.114007

Title: Sensitivity of the $η^{(')} \to π^{0} γ γ$ and $η^{'} \to η γ γ$ decays to a sub-GeV leptophobic $U (1)_{B}$ boson

Journal Article · Thu Dec 08 00:00:00 EST 2022 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.106.114007· OSTI ID:1902445

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The sensitivity of the rare decays η^(') → π⁰γγ and η' → ηγγ to signatures of a leptophobic B boson in the MeV–GeV mass range is analyzed in this work. By adding an explicit B-boson resonance exchange, η → Bγ → π⁰γγ, to the Standard Model contributions from vector and scalar meson exchanges, and employing experimental data for the associated branching ratios, it allows us to improve the current constraints on the B-boson mass mB and coupling to Standard Model particles α_B. From these constraints and the analysis of the available experimental γγ invariant mass distribution, we show that a B-boson signature in the resonant mass range m_π⁰ ≲ m_B ≲ m_η is strongly suppressed and would be very difficult to experimentally identify, assuming that the leptophobic B boson only decays to Standard Model particles. In contrast, the limits outside this mass window are less stringent and the corresponding t- and u-channel signatures may still be observable in the data, as it occurs with the nonresonant Standard Model ρ, ω and Φ meson exchanges. In addition, we make use of experimental data from the η' → π⁰γγ and η' → ηγγ decays to explore larger B-boson masses. Our results are relevant for the B-boson search programs at existing and forthcoming light-meson facilities, such as KLOE(-II) and Jefferson Lab Eta Factory experiments.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); European Union (EU); Spanish Ministry of Science and Innovation

Grant/Contract Number:: 20210944PRD2; 89233218CNA000001; 824093

OSTI ID:: 1902445

Alternate ID(s):: OSTI ID: 1906029

Report Number(s):: LA-UR-22-26889; PRVDAQ; 114007

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 106 Journal Issue: 11; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Sensitivity of the η ( ′ ) → π 0 γ γ and η ′ → η γ γ decays to a sub-GeV leptophobic U ( 1 ) B boson

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Title: Sensitivity of the $η^{(')} \to π^{0} γ γ$ and $η^{'} \to η γ γ$ decays to a sub-GeV leptophobic $U (1)_{B}$ boson