002919227 001__ 2919227
002919227 005__ 20241211041346.0
002919227 0248_ $$aoai:cds.cern.ch:2919227$$pcerncds:FULLTEXT$$pcerncds:CERN:FULLTEXT$$pcerncds:CERN
002919227 037__ $$9arXiv$$aarXiv:2410.08981$$chep-ph
002919227 035__ $$9arXiv$$aoai:arXiv.org:2410.08981
002919227 035__ $$9Inspire$$aoai:inspirehep.net:2839372$$d2024-12-10T20:06:40Z$$h2024-12-11T03:00:24Z$$mmarcxml$$ttrue$$uhttps://inspirehep.net/api/oai2d
002919227 035__ $$9Inspire$$a2839372
002919227 041__ $$aeng
002919227 100__ $$aCapozzi, Francesco$$uL'Aquila U.$$uGran Sasso$$vDipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, 67100 L'Aquila, Italy$$vIstituto Nazionale di Fisica Nucleare (INFN), Laboratori Nazionali del Gran Sasso, 67100 Assergi (AQ), Italy
002919227 245__ $$9arXiv$$aEnhancing the Sensitivity to Seesaw Predictions in Gauged $B-L$ Scenarios
002919227 269__ $$c2024-10-11
002919227 300__ $$a11 p
002919227 500__ $$9arXiv$$aCorrected mistakes in the calculation of the neutral meson production
and detector acceptance and subsequent sensitivity. Added information on the
assumed parameterization of hadronic form factors in proton bremsstrahlung
002919227 520__ $$9arXiv$$aNew gauge bosons coupled to heavy neutral leptons (HNLs) are simple and well-motivated extensions of the Standard Model. In searches for HNLs in proton fixed-target experiments, we find that a large population of gauge bosons ($Z^\prime$) produced by proton bremsstrahlung may decay to HNLs, leading to a significant improvement in existing bounds on the ($m_{HNL}, U_{\alpha}$), where $U_\alpha$ represent the mixing between HNL and the active neutrinos with flavor $\alpha$. We study this possibility in fixed target experiments with the 8 GeV proton beams, including SBND, MicroBooNE, and ICARUS, as well as DUNE and DarkQuest at 120 GeV. We find the projected sensitivities to additional $Z^\prime$-mediated HNL production can bring the seesaw mechanism of the neutrino masses within a broadened experimental reach.
002919227 541__ $$aarXiv$$chepcrawl$$d2024-11-06T04:04:50.600853$$e8417734
002919227 540__ $$3preprint$$aCC0 1.0$$uhttp://creativecommons.org/publicdomain/zero/1.0/
002919227 65017 $$2arXiv$$ahep-ph
002919227 65017 $$2SzGeCERN$$aParticle Physics - Phenomenology
002919227 690C_ $$aCERN
002919227 690C_ $$aPREPRINT
002919227 700__ $$aDutta, Bhaskar$$uTexas A-M$$vMitchell Institute for Fundamental Physics and Astronomy,$$vDepartment of Physics and Astronomy, Texas A&M University, College Station, TX 77845, USA
002919227 700__ $$aGurung, Gajendra$$uTexas U., Arlington$$uCERN$$vDepartment of Physics, University of Texas, Arlington, TX 76019, USA$$vCERN, Route de Meyrin, 1211 Geneva, Switzerland
002919227 700__ $$aJang, Wooyoung$$uTexas U., Arlington$$vDepartment of Physics, University of Texas, Arlington, TX 76019, USA
002919227 700__ $$aShoemaker, Ian M.$$uVirginia Tech.$$vCenter for Neutrino Physics, Department of Physics, Virginia Tech, Blacksburg, VA 24061, USA
002919227 700__ $$aThompson, Adrian$$uNorthwestern U.$$vNorthwestern University, Evanston, IL 60208, USA
002919227 700__ $$aYu, Jaehoon$$uTexas U., Arlington$$vDepartment of Physics, University of Texas, Arlington, TX 76019, USA
002919227 8564_ $$82694479$$s25394$$uhttp://cds.cern.ch/record/2919227/files/brs_zprime.png$$y00001 Branching ratios of the $B-L$ $Z^\prime$ to various final states including the majorana right-handed neutrino $N$. Here we take $m_{Z^\prime} = 5 \, m_N$.
002919227 8564_ $$82694480$$s40362$$uhttp://cds.cern.ch/record/2919227/files/umu_limits_massRatio-5_SBN.png$$y00005 Background-free sensitivity contours at 90\% C.L. for SBND, MicroBooNE, ICARUS-BNB, and DarkQuest as a function of $m_N$ and $\left|U_\mu\right|^2$ (left column) and $\left|U_\tau\right|^2$ (right column). Top panels refer to $\frac{m_{Z^\prime}}{m_N}=2.1$ while bottom ones refer to $\frac{m_{Z^\prime}}{m_N}=5$. We fix the coupling of the $Z^\prime$ to $g=10^{-4}$. We also show the limit from MicroBooNE for HNL production driven by the $|U_\mu|$ mixing angle alone~\cite{MicroBooNE:2019izn,PhysRevD.104.055015}. For DarkQuest, we show the approved exposure benchmark of $10^{18}$ POT as well as the proposed, larger exposure of $10^{20}$ POT (green lines) in comparison with the forecasted limits using only the mixing (purple)~\cite{Batell:2020vqn}.
002919227 8564_ $$82694481$$s35031$$uhttp://cds.cern.ch/record/2919227/files/utau_limits_massRatio-5_SBN.png$$y00006 Background-free sensitivity contours at 90\% C.L. for SBND, MicroBooNE, ICARUS-BNB, and DarkQuest as a function of $m_N$ and $\left|U_\mu\right|^2$ (left column) and $\left|U_\tau\right|^2$ (right column). Top panels refer to $\frac{m_{Z^\prime}}{m_N}=2.1$ while bottom ones refer to $\frac{m_{Z^\prime}}{m_N}=5$. We fix the coupling of the $Z^\prime$ to $g=10^{-4}$. We also show the limit from MicroBooNE for HNL production driven by the $|U_\mu|$ mixing angle alone~\cite{MicroBooNE:2019izn,PhysRevD.104.055015}. For DarkQuest, we show the approved exposure benchmark of $10^{18}$ POT as well as the proposed, larger exposure of $10^{20}$ POT (green lines) in comparison with the forecasted limits using only the mixing (purple)~\cite{Batell:2020vqn}.
002919227 8564_ $$82694482$$s31108$$uhttp://cds.cern.ch/record/2919227/files/utau_limits_massRatio-2_DUNE.png$$y00008 Number of particles from all visible decays in DUNE as a function of $m_N$ and $\left|U_\mu\right|^2$ (left column) and $\left|U_\tau\right|^2$ (right column). Top panels refer to $\frac{m_{Z^\prime}}{m_N}=2.1$ while bottom ones refer to $\frac{m_{Z^\prime}}{m_N}=5$. We fix the coupling of the $Z^\prime$ to $g=10^{-4}$. The solid, dashed, and dotted lines correspond to the iso-event contours for 3, 10, and 100 events, respectively, separated by production channel (neutral meson decays, electron/positron bremsstrahlung and resonant production, and proton bremsstrahlung). We also show the forecasted DUNE-ND sensitivity to HNLs produced only from the $|U_\mu|$ mixing-angle driven channels (teal dotted line)~\cite{Krasnov:2019kdc, Ballett:2019bgd}.
002919227 8564_ $$82694483$$s9625$$uhttp://cds.cern.ch/record/2919227/files/utau_limits_massRatio-5_DUNE.png$$y00010 Number of particles from all visible decays in DUNE as a function of $m_N$ and $\left|U_\mu\right|^2$ (left column) and $\left|U_\tau\right|^2$ (right column). Top panels refer to $\frac{m_{Z^\prime}}{m_N}=2.1$ while bottom ones refer to $\frac{m_{Z^\prime}}{m_N}=5$. We fix the coupling of the $Z^\prime$ to $g=10^{-4}$. The solid, dashed, and dotted lines correspond to the iso-event contours for 3, 10, and 100 events, respectively, separated by production channel (neutral meson decays, electron/positron bremsstrahlung and resonant production, and proton bremsstrahlung). We also show the forecasted DUNE-ND sensitivity to HNLs produced only from the $|U_\mu|$ mixing-angle driven channels (teal dotted line)~\cite{Krasnov:2019kdc, Ballett:2019bgd}.
002919227 8564_ $$82694484$$s1470199$$uhttp://cds.cern.ch/record/2919227/files/2410.08981.pdf$$yFulltext
002919227 8564_ $$82694485$$s28690$$uhttp://cds.cern.ch/record/2919227/files/umu_limits_massRatio-5_DUNE.png$$y00009 Number of particles from all visible decays in DUNE as a function of $m_N$ and $\left|U_\mu\right|^2$ (left column) and $\left|U_\tau\right|^2$ (right column). Top panels refer to $\frac{m_{Z^\prime}}{m_N}=2.1$ while bottom ones refer to $\frac{m_{Z^\prime}}{m_N}=5$. We fix the coupling of the $Z^\prime$ to $g=10^{-4}$. The solid, dashed, and dotted lines correspond to the iso-event contours for 3, 10, and 100 events, respectively, separated by production channel (neutral meson decays, electron/positron bremsstrahlung and resonant production, and proton bremsstrahlung). We also show the forecasted DUNE-ND sensitivity to HNLs produced only from the $|U_\mu|$ mixing-angle driven channels (teal dotted line)~\cite{Krasnov:2019kdc, Ballett:2019bgd}.
002919227 8564_ $$82694486$$s10480$$uhttp://cds.cern.ch/record/2919227/files/Zprime_flux_by_channel.png$$y00000 Number of $Z^\prime$ pointed within the solid angle of the DUNE near detector as a function of $m_{Z^\prime}$ for the different production channels, assuming $g_{B-L}=1$ and $1.47\times 10^{22}$ POT. In the case of proton bremsstrahlung, we do not use this channel below $m_{Z^\prime} = 250$ MeV as per~\cite{Foroughi-Abari:2021zbm}, but show the behavior of the event rate (dashed red) here for the interest of the reader.
002919227 8564_ $$82694487$$s80670$$uhttp://cds.cern.ch/record/2919227/files/brs_hnl_all_channels_wide.png$$y00002 HNL branching fractions as a function of the HNL mass $m_N$. Final states are indicated on the plot, and all neutrino flavors have been summed over.
002919227 8564_ $$82694488$$s44328$$uhttp://cds.cern.ch/record/2919227/files/umu_limits_massRatio-2_SBN.png$$y00003 Background-free sensitivity contours at 90\% C.L. for SBND, MicroBooNE, ICARUS-BNB, and DarkQuest as a function of $m_N$ and $\left|U_\mu\right|^2$ (left column) and $\left|U_\tau\right|^2$ (right column). Top panels refer to $\frac{m_{Z^\prime}}{m_N}=2.1$ while bottom ones refer to $\frac{m_{Z^\prime}}{m_N}=5$. We fix the coupling of the $Z^\prime$ to $g=10^{-4}$. We also show the limit from MicroBooNE for HNL production driven by the $|U_\mu|$ mixing angle alone~\cite{MicroBooNE:2019izn,PhysRevD.104.055015}. For DarkQuest, we show the approved exposure benchmark of $10^{18}$ POT as well as the proposed, larger exposure of $10^{20}$ POT (green lines) in comparison with the forecasted limits using only the mixing (purple)~\cite{Batell:2020vqn}.
002919227 8564_ $$82694489$$s39890$$uhttp://cds.cern.ch/record/2919227/files/utau_limits_massRatio-2_SBN.png$$y00004 Background-free sensitivity contours at 90\% C.L. for SBND, MicroBooNE, ICARUS-BNB, and DarkQuest as a function of $m_N$ and $\left|U_\mu\right|^2$ (left column) and $\left|U_\tau\right|^2$ (right column). Top panels refer to $\frac{m_{Z^\prime}}{m_N}=2.1$ while bottom ones refer to $\frac{m_{Z^\prime}}{m_N}=5$. We fix the coupling of the $Z^\prime$ to $g=10^{-4}$. We also show the limit from MicroBooNE for HNL production driven by the $|U_\mu|$ mixing angle alone~\cite{MicroBooNE:2019izn,PhysRevD.104.055015}. For DarkQuest, we show the approved exposure benchmark of $10^{18}$ POT as well as the proposed, larger exposure of $10^{20}$ POT (green lines) in comparison with the forecasted limits using only the mixing (purple)~\cite{Batell:2020vqn}.
002919227 8564_ $$82694490$$s40279$$uhttp://cds.cern.ch/record/2919227/files/umu_limits_massRatio-2_DUNE.png$$y00007 Number of particles from all visible decays in DUNE as a function of $m_N$ and $\left|U_\mu\right|^2$ (left column) and $\left|U_\tau\right|^2$ (right column). Top panels refer to $\frac{m_{Z^\prime}}{m_N}=2.1$ while bottom ones refer to $\frac{m_{Z^\prime}}{m_N}=5$. We fix the coupling of the $Z^\prime$ to $g=10^{-4}$. The solid, dashed, and dotted lines correspond to the iso-event contours for 3, 10, and 100 events, respectively, separated by production channel (neutral meson decays, electron/positron bremsstrahlung and resonant production, and proton bremsstrahlung). We also show the forecasted DUNE-ND sensitivity to HNLs produced only from the $|U_\mu|$ mixing-angle driven channels (teal dotted line)~\cite{Krasnov:2019kdc, Ballett:2019bgd}.
002919227 960__ $$a11
002919227 980__ $$aPREPRINT