001987116 001__ 1987116
001987116 005__ 20211211021031.0
001987116 0248_ $$aoai:cds.cern.ch:1987116$$pcerncds:CERN$$pcerncds:CERN:FULLTEXT$$pcerncds:FULLTEXT
001987116 0247_ $$2DOI$$a10.1016/j.physletb.2015.04.068
001987116 035__ $$9arXiv$$aoai:arXiv.org:1504.00607
001987116 035__ $$9Inspire$$a1357601
001987116 037__ $$9arXiv$$aarXiv:1504.00607$$chep-ex
001987116 037__ $$aCERN-PH-EP-2015-093
001987116 041__ $$aeng
001987116 084__ $$2CERN Library$$aPH-EP-2015-093
001987116 088__ $$9CERN-PH-EP-DRAFT-NA48-2015-001
001987116 100__ $$aBatley, J.R.$$uCambridge U.$$vCavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK 4 4 Funded by the UK Particle Physics and Astronomy Research Council , grant PPA/G/O/1999/00559 .
001987116 245__ $$aSearch for the dark photon in $\pi^0$ decays
001987116 269__ $$aGeneva$$bCERN$$c02 Apr 2015
001987116 260__ $$c2015-05-05
001987116 300__ $$a8 p
001987116 506__ $$dcds-edboard-na48@cern.ch
001987116 506__ $$mcds-readers-na48 [CERN]
001987116 506__ $$mcds-ph-ep-publications-referee-non-lhc [CERN]
001987116 500__ $$9arXiv$$aRevised version accepted for publication in Physics Letter B
001987116 520__ $$aA sample of $1.69\times 10^7$ fully reconstructed $\pi^0\to\gamma e^+e^-$ decay candidates collected by the NA48/2 experiment at CERN in $2003-2004$ is analysed to search for the dark photon ($A'$) production in the $\pi^0\to\gamma A'$ decay followed by the prompt $A'\to e^+e^-$ decay. No signal is observed, and an exclusion region in the plane of the dark photon mass $m_{A'}$ and mixing parameter $\varepsilon^2$ is established. The obtained upper limits on $\varepsilon^2$ are more stringent than the previous limits in the mass range 9 MeV/$c^2$ $< m_{A'} < 70$ MeV/$c^2$. The NA48/2 sensitivity to the dark photon production in the $K^\pm \to \pi^\pm A'$ decay is also evaluated.
001987116 520__ $$9Elsevier$$aA sample of 1.69×107 fully reconstructed π0→γe+e− decay candidates collected by the NA48/2 experiment at CERN in 2003–2004 is analyzed to search for the dark photon ( A′ ) production in the π0→γA′ decay followed by the prompt A′→e+e− decay. No signal is observed, and an exclusion region in the plane of the dark photon mass mA′ and mixing parameter ε2 is established. The obtained upper limits on ε2 are more stringent than the previous limits in the mass range 9 MeV/c2<mA′<70 MeV/c2 . The NA48/2 sensitivity to the dark photon production in the K±→π±A′ decay is also evaluated.
001987116 520__ $$9arXiv$$aA sample of $1.69\times 10^7$ fully reconstructed $\pi^0\to\gamma e^+e^-$ decay candidates collected by the NA48/2 experiment at CERN in 2003--2004 is analysed to search for the dark photon ($A'$) production in the $\pi^0\to\gamma A'$ decay followed by the prompt $A'\to e^+e^-$ decay. No signal is observed, and an exclusion region in the plane of the dark photon mass $m_{A'}$ and mixing parameter $\varepsilon^2$ is established. The obtained upper limits on $\varepsilon^2$ are more stringent than the previous limits in the mass range $9~{\rm MeV}/c^2<m_{A'}<70~{\rm MeV}/c^2$. The NA48/2 sensitivity to the dark photon production in the $K^\pm\to\pi^\pm A'$ decay is also evaluated.
001987116 540__ $$3Preprint$$aCC-BY-4.0
001987116 540__ $$3Publication$$aCC-BY-4.0$$fSCOAP3
001987116 542__ $$3Preprint$$dCERN$$g2015
001987116 542__ $$3Preprint$$dThe Author(s)$$g2015
001987116 562__ $$cComments submitted after 30-04-2015 19:31
001987116 595__ $$aautomerged
001987116 595__ $$aCERN-PH-EP
001987116 65017 $$2SzGeCERN$$aParticle Physics - Experiment
001987116 6531_ $$9CERN$$aexotics
001987116 6531_ $$9CERN$$arare decay
001987116 6531_ $$9CERN$$aexperimental results
001987116 6531_ $$9CERN$$aSearch for Dark Photon
001987116 6531_ $$9CERN$$aRare pi0 decay
001987116 690C_ $$aCERN
001987116 690C_ $$aARTICLE
001987116 693__ $$aCERN SPS$$eNA48/2
001987116 690C_ $$aNA48_Papers
001987116 695__ $$9LANL EDS$$ahep-ex
001987116 700__ $$aKalmus, G.$$uCambridge U.$$vCavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK 4 4 Funded by the UK Particle Physics and Astronomy Research Council , grant PPA/G/O/1999/00559 .
001987116 700__ $$aLazzeroni, C.$$uCambridge U.$$vCavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK 4 4 Funded by the UK Particle Physics and Astronomy Research Council , grant PPA/G/O/1999/00559 .
001987116 700__ $$aMunday, D.J.$$uCambridge U.$$vCavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK 4 4 Funded by the UK Particle Physics and Astronomy Research Council , grant PPA/G/O/1999/00559 .
001987116 700__ $$aSlater, M.W.$$uCambridge U.$$vCavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK 4 4 Funded by the UK Particle Physics and Astronomy Research Council , grant PPA/G/O/1999/00559 .
001987116 700__ $$aWotton, S.A.$$uCambridge U.$$vCavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UK 4 4 Funded by the UK Particle Physics and Astronomy Research Council , grant PPA/G/O/1999/00559 .
001987116 700__ $$aArcidiacono, R.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aBocquet, G.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aCabibbo, N.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aCeccucci, A.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aCundy, D.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aFalaleev, V.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aFidecaro, M.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aGatignon, L.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aGonidec, A.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aKubischta, W.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aNorton, A.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aMaier, A.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aPatel, M.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aPeters, A.$$uCERN$$vCERN, CH-1211 Genève 23, Switzerland
001987116 700__ $$aBalev, S.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aFrabetti, P.L.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aGersabeck, E.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aGoudzovski, E.$$meg@hep.ph.bham.ac.uk$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aHristov, P.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aKekelidze, V.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aKozhuharov, V.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aLitov, L.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aMadigozhin, D.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aMolokanova, N.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aPolenkevich, I.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aPotrebenikov, Yu.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aStoynev, S.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aZinchenko, A.$$uDubna, JINR$$vJoint Institute for Nuclear Research, 141980 Dubna (MO), Russia
001987116 700__ $$aMonnier, E.$$uChicago U., EFI$$vThe Enrico Fermi Institute, The University of Chicago, Chicago, IL 60126, USA
001987116 700__ $$aSwallow, E.$$uChicago U., EFI$$vThe Enrico Fermi Institute, The University of Chicago, Chicago, IL 60126, USA
001987116 700__ $$aWinston, R.$$uChicago U., EFI$$vThe Enrico Fermi Institute, The University of Chicago, Chicago, IL 60126, USA
001987116 700__ $$aRubin, P.$$uEdinburgh U.$$vDepartment of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3JZ, UK
001987116 700__ $$aWalker, A.$$uEdinburgh U.$$vDepartment of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3JZ, UK
001987116 700__ $$aBaldini, W.$$uFerrara U.$$uINFN, Ferrara$$vDipartimento di Fisica e Scienze della Terra dell'Università e Sezione dell'INFN di Ferrara, I-44122 Ferrara, Italy
001987116 700__ $$aCotta Ramusino, A.$$uFerrara U.$$uINFN, Ferrara$$vDipartimento di Fisica e Scienze della Terra dell'Università e Sezione dell'INFN di Ferrara, I-44122 Ferrara, Italy
001987116 700__ $$aDalpiaz, P.$$uFerrara U.$$uINFN, Ferrara$$vDipartimento di Fisica e Scienze della Terra dell'Università e Sezione dell'INFN di Ferrara, I-44122 Ferrara, Italy
001987116 700__ $$aDamiani, C.$$uFerrara U.$$uINFN, Ferrara$$vDipartimento di Fisica e Scienze della Terra dell'Università e Sezione dell'INFN di Ferrara, I-44122 Ferrara, Italy
001987116 700__ $$aFiorini, M.$$uFerrara U.$$uINFN, Ferrara$$vDipartimento di Fisica e Scienze della Terra dell'Università e Sezione dell'INFN di Ferrara, I-44122 Ferrara, Italy
001987116 700__ $$aGianoli, A.$$uFerrara U.$$uINFN, Ferrara$$vDipartimento di Fisica e Scienze della Terra dell'Università e Sezione dell'INFN di Ferrara, I-44122 Ferrara, Italy
001987116 700__ $$aMartini, M.$$uFerrara U.$$uINFN, Ferrara$$vDipartimento di Fisica e Scienze della Terra dell'Università e Sezione dell'INFN di Ferrara, I-44122 Ferrara, Italy
001987116 700__ $$aPetrucci, F.$$uFerrara U.$$uINFN, Ferrara$$vDipartimento di Fisica e Scienze della Terra dell'Università e Sezione dell'INFN di Ferrara, I-44122 Ferrara, Italy
001987116 700__ $$aSavrie, M.$$uFerrara U.$$uINFN, Ferrara$$vDipartimento di Fisica e Scienze della Terra dell'Università e Sezione dell'INFN di Ferrara, I-44122 Ferrara, Italy
001987116 700__ $$aScarpa, M.$$uFerrara U.$$uINFN, Ferrara$$vDipartimento di Fisica e Scienze della Terra dell'Università e Sezione dell'INFN di Ferrara, I-44122 Ferrara, Italy
001987116 700__ $$aWahl, H.$$uFerrara U.$$uINFN, Ferrara$$vDipartimento di Fisica e Scienze della Terra dell'Università e Sezione dell'INFN di Ferrara, I-44122 Ferrara, Italy
001987116 700__ $$aBizzeti, A.$$uINFN, Florence$$vSezione dell'INFN di Firenze, I-50019 Sesto Fiorentino, Italy
001987116 700__ $$aLenti, M.$$uINFN, Florence$$vSezione dell'INFN di Firenze, I-50019 Sesto Fiorentino, Italy
001987116 700__ $$aVeltri, M.$$uINFN, Florence$$vSezione dell'INFN di Firenze, I-50019 Sesto Fiorentino, Italy
001987116 700__ $$aCalvetti, M.$$uFlorence U.$$uINFN, Florence$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Firenze, I-50019 Sesto Fiorentino, Italy
001987116 700__ $$aCeleghini, E.$$uFlorence U.$$uINFN, Florence$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Firenze, I-50019 Sesto Fiorentino, Italy
001987116 700__ $$aIacopini, E.$$uFlorence U.$$uINFN, Florence$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Firenze, I-50019 Sesto Fiorentino, Italy
001987116 700__ $$aRuggiero, G.$$uFlorence U.$$uINFN, Florence$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Firenze, I-50019 Sesto Fiorentino, Italy
001987116 700__ $$aBehler, M.$$uMainz U., Inst. Phys.$$vInstitut für Physik, Universität Mainz, D-55099 Mainz, Germany 21 21 Funded by the German Federal Minister for Education and Research under contract 05HK1UM1/1 .
001987116 700__ $$aEppard, K.$$uMainz U., Inst. Phys.$$vInstitut für Physik, Universität Mainz, D-55099 Mainz, Germany 21 21 Funded by the German Federal Minister for Education and Research under contract 05HK1UM1/1 .
001987116 700__ $$aKleinknecht, K.$$uMainz U., Inst. Phys.$$vInstitut für Physik, Universität Mainz, D-55099 Mainz, Germany 21 21 Funded by the German Federal Minister for Education and Research under contract 05HK1UM1/1 .
001987116 700__ $$aMarouelli, P.$$uMainz U., Inst. Phys.$$vInstitut für Physik, Universität Mainz, D-55099 Mainz, Germany 21 21 Funded by the German Federal Minister for Education and Research under contract 05HK1UM1/1 .
001987116 700__ $$aMasetti, L.$$uMainz U., Inst. Phys.$$vInstitut für Physik, Universität Mainz, D-55099 Mainz, Germany 21 21 Funded by the German Federal Minister for Education and Research under contract 05HK1UM1/1 .
001987116 700__ $$aMoosbrugger, U.$$uMainz U., Inst. Phys.$$vInstitut für Physik, Universität Mainz, D-55099 Mainz, Germany 21 21 Funded by the German Federal Minister for Education and Research under contract 05HK1UM1/1 .
001987116 700__ $$aMorales Morales, C.$$uMainz U., Inst. Phys.$$vInstitut für Physik, Universität Mainz, D-55099 Mainz, Germany 21 21 Funded by the German Federal Minister for Education and Research under contract 05HK1UM1/1 .
001987116 700__ $$aRenk, B.$$uMainz U., Inst. Phys.$$vInstitut für Physik, Universität Mainz, D-55099 Mainz, Germany 21 21 Funded by the German Federal Minister for Education and Research under contract 05HK1UM1/1 .
001987116 700__ $$aWache, M.$$uMainz U., Inst. Phys.$$vInstitut für Physik, Universität Mainz, D-55099 Mainz, Germany 21 21 Funded by the German Federal Minister for Education and Research under contract 05HK1UM1/1 .
001987116 700__ $$aWanke, R.$$uMainz U., Inst. Phys.$$vInstitut für Physik, Universität Mainz, D-55099 Mainz, Germany 21 21 Funded by the German Federal Minister for Education and Research under contract 05HK1UM1/1 .
001987116 700__ $$aWinhart, A.$$uMainz U., Inst. Phys.$$vInstitut für Physik, Universität Mainz, D-55099 Mainz, Germany 21 21 Funded by the German Federal Minister for Education and Research under contract 05HK1UM1/1 .
001987116 700__ $$aCoward, D.$$uNorthwestern U.$$vDepartment of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA
001987116 700__ $$aDabrowski, A.$$uNorthwestern U.$$vDepartment of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA
001987116 700__ $$aFonseca Martin, T.$$uNorthwestern U.$$vDepartment of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA
001987116 700__ $$aShieh, M.$$uNorthwestern U.$$vDepartment of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA
001987116 700__ $$aSzleper, M.$$uNorthwestern U.$$vDepartment of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA
001987116 700__ $$aVelasco, M.$$uNorthwestern U.$$vDepartment of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA
001987116 700__ $$aWood, M.D.$$uNorthwestern U.$$vDepartment of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA
001987116 700__ $$aCenci, P.$$uINFN, Perugia$$vSezione dell'INFN di Perugia, I-06100 Perugia, Italy
001987116 700__ $$aPepe, M.$$uINFN, Perugia$$vSezione dell'INFN di Perugia, I-06100 Perugia, Italy
001987116 700__ $$aPetrucci, M.C.$$uINFN, Perugia$$vSezione dell'INFN di Perugia, I-06100 Perugia, Italy
001987116 700__ $$aAnzivino, G.$$uPerugia U.$$uINFN, Perugia$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Perugia, I-06100 Perugia, Italy
001987116 700__ $$aImbergamo, E.$$uPerugia U.$$uINFN, Perugia$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Perugia, I-06100 Perugia, Italy
001987116 700__ $$aNappi, A.$$uPerugia U.$$uINFN, Perugia$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Perugia, I-06100 Perugia, Italy
001987116 700__ $$aPiccini, M.$$uPerugia U.$$uINFN, Perugia$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Perugia, I-06100 Perugia, Italy
001987116 700__ $$aRaggi, M.$$uPerugia U.$$uINFN, Perugia$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Perugia, I-06100 Perugia, Italy
001987116 700__ $$aValdata-Nappi, M.$$uPerugia U.$$uINFN, Perugia$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Perugia, I-06100 Perugia, Italy
001987116 700__ $$aCerri, C.$$uINFN, Pisa$$vSezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aFantechi, R.$$uINFN, Pisa$$vSezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aCollazuol, G.$$uINFN, Pisa$$vScuola Normale Superiore e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aDiLella, L.$$uINFN, Pisa$$vScuola Normale Superiore e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aLamanna, G.$$uINFN, Pisa$$vScuola Normale Superiore e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aMannelli, I.$$uINFN, Pisa$$vScuola Normale Superiore e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aMichetti, A.$$uINFN, Pisa$$vScuola Normale Superiore e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aCostantini, F.$$uPisa U.$$uINFN, Pisa$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aDoble, N.$$uPisa U.$$uINFN, Pisa$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aFiorini, L.$$uPisa U.$$uINFN, Pisa$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aGiudici, S.$$uPisa U.$$uINFN, Pisa$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aPierazzini, G.$$uPisa U.$$uINFN, Pisa$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aSozzi, M.$$uPisa U.$$uINFN, Pisa$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aVenditti, S.$$uPisa U.$$uINFN, Pisa$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Pisa, I-56100 Pisa, Italy
001987116 700__ $$aBloch-Devaux, B.$$uIRFU, Saclay$$uCEA, DSM, Saclay$$vDSM/IRFU – CEA Saclay, F-91191 Gif-sur-Yvette, France
001987116 700__ $$aCheshkov, C.$$uIRFU, Saclay$$uCEA, DSM, Saclay$$vDSM/IRFU – CEA Saclay, F-91191 Gif-sur-Yvette, France
001987116 700__ $$aCheze, J.B.$$uIRFU, Saclay$$uCEA, DSM, Saclay$$vDSM/IRFU – CEA Saclay, F-91191 Gif-sur-Yvette, France
001987116 700__ $$aDe Beer, M.$$uIRFU, Saclay$$uCEA, DSM, Saclay$$vDSM/IRFU – CEA Saclay, F-91191 Gif-sur-Yvette, France
001987116 700__ $$aDerre, J.$$uIRFU, Saclay$$uCEA, DSM, Saclay$$vDSM/IRFU – CEA Saclay, F-91191 Gif-sur-Yvette, France
001987116 700__ $$aMarel, G.$$uIRFU, Saclay$$uCEA, DSM, Saclay$$vDSM/IRFU – CEA Saclay, F-91191 Gif-sur-Yvette, France
001987116 700__ $$aMazzucato, E.$$uIRFU, Saclay$$uCEA, DSM, Saclay$$vDSM/IRFU – CEA Saclay, F-91191 Gif-sur-Yvette, France
001987116 700__ $$aPeyaud, B.$$uIRFU, Saclay$$uCEA, DSM, Saclay$$vDSM/IRFU – CEA Saclay, F-91191 Gif-sur-Yvette, France
001987116 700__ $$aVallage, B.$$uIRFU, Saclay$$uCEA, DSM, Saclay$$vDSM/IRFU – CEA Saclay, F-91191 Gif-sur-Yvette, France
001987116 700__ $$aHolder, M.$$uSiegen U.$$vFachbereich Physik, Universität Siegen, D-57068 Siegen, Germany 27 27 Funded by the German Federal Minister for Research and Technology ( BMBF ) under contract 056SI74 .
001987116 700__ $$aZiolkowski, M.$$uSiegen U.$$vFachbereich Physik, Universität Siegen, D-57068 Siegen, Germany 27 27 Funded by the German Federal Minister for Research and Technology ( BMBF ) under contract 056SI74 .
001987116 700__ $$aBiino, C.$$uINFN, Turin$$vSezione dell'INFN di Torino, I-10125 Torino, Italy
001987116 700__ $$aCartiglia, N.$$uINFN, Turin$$vSezione dell'INFN di Torino, I-10125 Torino, Italy
001987116 700__ $$aMarchetto, F.$$uINFN, Turin$$vSezione dell'INFN di Torino, I-10125 Torino, Italy
001987116 700__ $$aBifani, S.$$uTurin U.$$uINFN, Turin$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Torino, I-10125 Torino, Italy
001987116 700__ $$aClemencic, M.$$uTurin U.$$uINFN, Turin$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Torino, I-10125 Torino, Italy
001987116 700__ $$aGoy Lopez, S.$$uTurin U.$$uINFN, Turin$$vDipartimento di Fisica dell'Università e Sezione dell'INFN di Torino, I-10125 Torino, Italy
001987116 700__ $$aDibon, H.$$uVienna, OAW$$vÖsterreichische Akademie der Wissenschaften, Institut für Hochenergiephysik, A-10560 Wien, Austria 29 29 Funded by the Austrian Ministry for Traffic and Research under the contract GZ 616.360/2-IV GZ 616.363/2-VIII , and by the Fonds für Wissenschaft und Forschung FWF No. P08929-PHY .
001987116 700__ $$aJeitler, M.$$uVienna, OAW$$vÖsterreichische Akademie der Wissenschaften, Institut für Hochenergiephysik, A-10560 Wien, Austria 29 29 Funded by the Austrian Ministry for Traffic and Research under the contract GZ 616.360/2-IV GZ 616.363/2-VIII , and by the Fonds für Wissenschaft und Forschung FWF No. P08929-PHY .
001987116 700__ $$aMarkytan, M.$$uVienna, OAW$$vÖsterreichische Akademie der Wissenschaften, Institut für Hochenergiephysik, A-10560 Wien, Austria 29 29 Funded by the Austrian Ministry for Traffic and Research under the contract GZ 616.360/2-IV GZ 616.363/2-VIII , and by the Fonds für Wissenschaft und Forschung FWF No. P08929-PHY .
001987116 700__ $$aMikulec, I.$$uVienna, OAW$$vÖsterreichische Akademie der Wissenschaften, Institut für Hochenergiephysik, A-10560 Wien, Austria 29 29 Funded by the Austrian Ministry for Traffic and Research under the contract GZ 616.360/2-IV GZ 616.363/2-VIII , and by the Fonds für Wissenschaft und Forschung FWF No. P08929-PHY .
001987116 700__ $$aNeuhofer, G.$$uVienna, OAW$$vÖsterreichische Akademie der Wissenschaften, Institut für Hochenergiephysik, A-10560 Wien, Austria 29 29 Funded by the Austrian Ministry for Traffic and Research under the contract GZ 616.360/2-IV GZ 616.363/2-VIII , and by the Fonds für Wissenschaft und Forschung FWF No. P08929-PHY .
001987116 700__ $$aWidhalm, L.$$uVienna, OAW$$vÖsterreichische Akademie der Wissenschaften, Institut für Hochenergiephysik, A-10560 Wien, Austria 29 29 Funded by the Austrian Ministry for Traffic and Research under the contract GZ 616.360/2-IV GZ 616.363/2-VIII , and by the Fonds für Wissenschaft und Forschung FWF No. P08929-PHY .
001987116 710__ $$5PH
001987116 710__ $$gNA48/2 Collaboration
001987116 773__ $$c178-185$$pPhys. Lett. B$$v746$$y2015
001987116 859__ $$fbrigitte.bloch-devaux@cern.ch
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001987116 8564_ $$81045339$$s302422$$uhttps://cds.cern.ch/record/1987116/files/CERN-PH-EP-DRAFT-NA48-2015-001 - draft.pdf$$yDraft (restricted)$$zStamped by WebSubmit: 02/04/2015
001987116 8564_ $$81045339$$s1698485$$uhttps://cds.cern.ch/record/1987116/files/CERN-PH-EP-DRAFT-NA48-2015-001 - draft.pdf?subformat=pdfa$$xpdfa$$yDraft (restricted)$$zStamped by WebSubmit: 02/04/2015
001987116 8564_ $$uhttp://arxiv.org/pdf/1504.00607$$yPreprint
001987116 8564_ $$81078729$$s267815$$uhttps://cds.cern.ch/record/1987116/files/arXiv:1504.00607.pdf
001987116 8564_ $$81078731$$s40460$$uhttps://cds.cern.ch/record/1987116/files/ul-br.png$$y00007 a)~Acceptances of the joint DP selection for $K_{2\pi}$, $K_{\mu 3}$ and $K_{3\pi}$ decays followed by the prompt decay chain $\pi^0\to\gamma A'$, $A'\to e^+e^-$ depending on the assumed DP mass, evaluated with MC simulations. The $K_{3\pi}$ acceptance is scaled by a factor of 10 for visibility. b)~Obtained upper limits on ${\cal B}(\pi^0\to\gamma A')$ at 90\% CL for each DP mass value $m_{A'}$.
001987116 8564_ $$81078735$$s40534$$uhttps://cds.cern.ch/record/1987116/files/mee1.png$$y00001 Invariant mass distributions of data and MC events passing the $K_{2\pi D}$ (top row) and $K_{\mu3 D}$ (bottom row) selections. The signal mass regions are indicated with vertical arrows. A dark photon signal would correspond to a spike in the $m_{ee}$ distributions (right column).
001987116 8564_ $$81078730$$s40997$$uhttps://cds.cern.ch/record/1987116/files/significance.png$$y00005 a)~Numbers of observed data events ($N_{\rm obs}$) and expected $\pi^0_D$ background events ($N_{\rm exp}$) passing the joint DP selection (indistinguishable in a logarithmic scale), estimated uncertainties $\delta N_{\rm obs}=\sqrt{N_{\rm exp}}$ and $\delta N_{\rm exp}$, and obtained upper limits at 90\% CL on the numbers of DP candidates ($N_{\rm DP}$) for each DP mass value $m_{A'}$. The contribution to $\delta N_{\rm exp}$ from the MC statistical uncertainty is shown separately ($\delta N_{\exp}^{\rm MC}$). The remaining and dominant component is due to the statistical errors on the trigger efficiencies measured in the DP signal region. b)~Estimated local significance of the DP signal for each $A'$ mass value. All presented quantities are strongly correlated for neighbouring DP masses as the mass step of the scan is about 6 times smaller than the signal window width.
001987116 8564_ $$81078727$$s47320$$uhttps://cds.cern.ch/record/1987116/files/m2pi.png$$y00000 Invariant mass distributions of data and MC events passing the $K_{2\pi D}$ (top row) and $K_{\mu3 D}$ (bottom row) selections. The signal mass regions are indicated with vertical arrows. A dark photon signal would correspond to a spike in the $m_{ee}$ distributions (right column).
001987116 8564_ $$81078728$$s50061$$uhttps://cds.cern.ch/record/1987116/files/mmiss2.png$$y00002 Invariant mass distributions of data and MC events passing the $K_{2\pi D}$ (top row) and $K_{\mu3 D}$ (bottom row) selections. The signal mass regions are indicated with vertical arrows. A dark photon signal would correspond to a spike in the $m_{ee}$ distributions (right column).
001987116 8564_ $$81078736$$s50722$$uhttps://cds.cern.ch/record/1987116/files/mee2.png$$y00003 Invariant mass distributions of data and MC events passing the $K_{2\pi D}$ (top row) and $K_{\mu3 D}$ (bottom row) selections. The signal mass regions are indicated with vertical arrows. A dark photon signal would correspond to a spike in the $m_{ee}$ distributions (right column).
001987116 8564_ $$81078732$$s54431$$uhttps://cds.cern.ch/record/1987116/files/dp-acc.png$$y00006 a)~Acceptances of the joint DP selection for $K_{2\pi}$, $K_{\mu 3}$ and $K_{3\pi}$ decays followed by the prompt decay chain $\pi^0\to\gamma A'$, $A'\to e^+e^-$ depending on the assumed DP mass, evaluated with MC simulations. The $K_{3\pi}$ acceptance is scaled by a factor of 10 for visibility. b)~Obtained upper limits on ${\cal B}(\pi^0\to\gamma A')$ at 90\% CL for each DP mass value $m_{A'}$.
001987116 8564_ $$81078733$$s66053$$uhttps://cds.cern.ch/record/1987116/files/DP-ingredients.png$$y00004 a)~Numbers of observed data events ($N_{\rm obs}$) and expected $\pi^0_D$ background events ($N_{\rm exp}$) passing the joint DP selection (indistinguishable in a logarithmic scale), estimated uncertainties $\delta N_{\rm obs}=\sqrt{N_{\rm exp}}$ and $\delta N_{\rm exp}$, and obtained upper limits at 90\% CL on the numbers of DP candidates ($N_{\rm DP}$) for each DP mass value $m_{A'}$. The contribution to $\delta N_{\rm exp}$ from the MC statistical uncertainty is shown separately ($\delta N_{\exp}^{\rm MC}$). The remaining and dominant component is due to the statistical errors on the trigger efficiencies measured in the DP signal region. b)~Estimated local significance of the DP signal for each $A'$ mass value. All presented quantities are strongly correlated for neighbouring DP masses as the mass step of the scan is about 6 times smaller than the signal window width.
001987116 8564_ $$81078734$$s72517$$uhttps://cds.cern.ch/record/1987116/files/world.png$$y00008 Obtained upper limits at 90\% CL on the mixing parameter $\varepsilon^2$ versus the DP mass $m_{A'}$, compared to other published exclusion limits from meson decay, beam dump and $e^+e^-$ collider experiments~\cite{an12,bab13,ad13,ag14,me14,ab11,le14}. Also shown is the band where the consistency of theoretical and experimental values of muon $(g-2)$ improves to $\pm 2\sigma$ or less, as well as the region excluded by the electron $(g-2)$ measurement~\cite{po09,da14}.
001987116 8564_ $$81078715$$s1699343$$uhttps://cds.cern.ch/record/1987116/files/CERN-PH-EP-2015-093.pdf?subformat=pdfa$$xpdfa
001987116 8564_ $$81187297$$s499507$$uhttps://cds.cern.ch/record/1987116/files/scoap3-fulltext.pdf$$yArticle from SCOAP3
001987116 9031_ $$aApproval requested for number CERN-PH-EP-2015-093$$bCERN-PH-EP-2015-093$$cEPPHAPP$$d2015-04-02 16:15:57$$e2015-04-09 16:15:57$$fbrigitte.bloch-devaux@cern.ch$$swaiting
001987116 9031_ $$aDocument approved$$bCERN-PH-EP-2015-093$$cEPPHAPP$$d2015-04-02 17:30:17$$froger.forty@cern.ch$$sapproved
001987116 916__ $$sn$$w201514
001987116 960__ $$a13
001987116 980__ $$aNA48_Papers
001987116 980__ $$aARTICLE