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20 April 2024

» arxiv » 1108.2750

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Search for a new gauge boson in the $A'$ Experiment (APEX)
S.Abrahamyan ; Z.Ahmed ; K.Allada ; D.Anez ; T.Averett ; A.Barbieri ; K.Bartlett ; J.Beacham ; J.Bono ; J.R.Boyce ; P.Brindza ; A.Camsonne ; K.Cranmer ; M.M.Dalton ; C.W.deJager ; J.Donaghy ; R.Essig ; C.Field ; E.Folts ; A.Gasparian ; N.Goeckner-Wald ; J.Gomez ; M.Graham ; J.-O.Hansen ; D.W.Higinbotham ; T.Holmstrom ; J.Huang ; S.Iqbal ; J.Jaros ; E.Jensen ; A.Kelleher ; M.Khandaker ; J.J.LeRose ; R.Lindgren ; N.Liyanage ; E.Long ; J.Mammei ; P.Markowitz ; T.Maruyama ; V.Maxwell ; S.Mayilyan ; J.McDonald ; R.Michaels ; K.Moffeit ; V.Nelyubin ; A.Odian ; M.Oriunno ; R.Partridge ; M.Paolone ; E.Piasetzky ; I.Pomerantz ; Y.Qiang ; S.Riordan ; Y.Roblin ; B.Sawatzky ; P.Schuster ; J.Segal ; L.Selvy ; A.Shahinyan ; R.Subedi ; V.Sulkosky ; S.Stepanyan ; N.Toro ; D.Walz ; B.Wojtsekhowski ; J.Zhang ;
Date:	13 Aug 2011
Abstract:	We present a search at Jefferson Laboratory for new forces mediated by sub-GeV vector bosons with weak coupling $alpha’$ to electrons. Such a particle $A’$ can be produced in electron-nucleus fixed-target scattering and then decay to an $e^+e^-$ pair, producing a narrow resonance in the QED trident spectrum. Using APEX test run data, we searched in the mass range 175--250 MeV, found no evidence for an $A’ o e^+e^-$ reaction, and set an upper limit of $alpha’/alpha simeq 10^{-6}$. Our findings demonstrate that fixed-target searches can explore a new, wide, and important range of masses and couplings for sub-GeV forces.
Source:	arXiv, 1108.2750
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