Search for the dark photon in $\pi^0$ decays

Batley, J.R.; Cheze, J.B.; Derre, J.; Goudzovski, E.; Cundy, D.; Cartiglia, N.; Lazzeroni, C.; Mazzucato, E.; Calvetti, M.; Norton, A.; Coward, D.; Maier, A.; De Beer, M.; Dibon, H.; Scarpa, M.; Hristov, P.; Fonseca Martin, T.; Kleinknecht, K.; Ruggiero, G.; Cheshkov, C.; Kubischta, W.; Costantini, F.; DiLella, L.; Giudici, S.; Monnier, E.; Fiorini, L.; Dalpiaz, P.; Behler, M.; Ceccucci, A.; Goy Lopez, S.; Veltri, M.; Gatignon, L.; Pepe, M.; Peyaud, B.; Gonidec, A.; Michetti, A.; Doble, N.; Fidecaro, M.; Gersabeck, E.; Walker, A.; Mannelli, I.; Martini, M.; Szleper, M.; Shieh, M.; Iacopini, E.; Eppard, K.; Anzivino, G.; Raggi, M.; Winhart, A.; Kozhuharov, V.; Lamanna, G.; Holder, M.; Marchetto, F.; Cotta Ramusino, A.; Wotton, S.A.; Fiorini, M.; Wahl, H.; Winston, R.; Mikulec, I.; Marel, G.; Frabetti, P.L.; Bifani, S.; Imbergamo, E.; Wache, M.; Markytan, M.; Peters, A.; Vallage, B.; Piccini, M.; Masetti, L.; Wanke, R.; Slater, M.W.; Polenkevich, I.; Stoynev, S.; Valdata-Nappi, M.; Swallow, E.; Cabibbo, N.; Litov, L.; Zinchenko, A.; Celeghini, E.; Munday, D.J.; Nappi, A.; Kalmus, G.; Moosbrugger, U.; Collazuol, G.; Pierazzini, G.; Marouelli, P.; Petrucci, F.; Savrie, M.; Bloch-Devaux, B.; Velasco, M.; Balev, S.; Sozzi, M.; Biino, C.; Gianoli, A.; Patel, M.; Renk, B.; Damiani, C.; Bocquet, G.; Baldini, W.; Neuhofer, G.; Cenci, P.; Cerri, C.; Jeitler, M.; Wood, M.D.; Falaleev, V.; Petrucci, M.C.; Lenti, M.; Kekelidze, V.; Morales Morales, C.; Clemencic, M.; Potrebenikov, Yu.; Dabrowski, A.; Fantechi, R.; Bizzeti, A.; Madigozhin, D.; Molokanova, N.; Arcidiacono, R.; Rubin, P.; Widhalm, L.; Venditti, S.; Ziolkowski, M.

doi:10.1016/j.physletb.2015.04.068

Article
Report number	arXiv:1504.00607 ; CERN-PH-EP-2015-093
Title	Search for the dark photon in $\pi^0$ decays
Author(s)	Batley, J.R. (Cambridge U.) ; Kalmus, G. (Cambridge U.) ; Lazzeroni, C. (Cambridge U.) ; Munday, D.J. (Cambridge U.) ; Slater, M.W. (Cambridge U.) ; Wotton, S.A. (Cambridge U.) ; Arcidiacono, R. (CERN) ; Bocquet, G. (CERN) ; Cabibbo, N. (CERN) ; Ceccucci, A. (CERN) ; Cundy, D. (CERN) ; Falaleev, V. (CERN) ; Fidecaro, M. (CERN) ; Gatignon, L. (CERN) ; Gonidec, A. (CERN) ; Kubischta, W. (CERN) ; Norton, A. (CERN) ; Maier, A. (CERN) ; Patel, M. (CERN) ; Peters, A. (CERN) ; Balev, S. (Dubna, JINR) ; Frabetti, P.L. (Dubna, JINR) ; Gersabeck, E. (Dubna, JINR) ; Goudzovski, E. (Dubna, JINR) ; Hristov, P. (Dubna, JINR) ; Kekelidze, V. (Dubna, JINR) ; Kozhuharov, V. (Dubna, JINR) ; Litov, L. (Dubna, JINR) ; Madigozhin, D. (Dubna, JINR) ; Molokanova, N. (Dubna, JINR) ; Polenkevich, I. (Dubna, JINR) ; Potrebenikov, Yu. (Dubna, JINR) ; Stoynev, S. (Dubna, JINR) ; Zinchenko, A. (Dubna, JINR) ; Monnier, E. (Chicago U., EFI) ; Swallow, E. (Chicago U., EFI) ; Winston, R. (Chicago U., EFI) ; Rubin, P. (Edinburgh U.) ; Walker, A. (Edinburgh U.) ; Baldini, W. (Ferrara U. ; INFN, Ferrara) ; Cotta Ramusino, A. (Ferrara U. ; INFN, Ferrara) ; Dalpiaz, P. (Ferrara U. ; INFN, Ferrara) ; Damiani, C. (Ferrara U. ; INFN, Ferrara) ; Fiorini, M. (Ferrara U. ; INFN, Ferrara) ; Gianoli, A. (Ferrara U. ; INFN, Ferrara) ; Martini, M. (Ferrara U. ; INFN, Ferrara) ; Petrucci, F. (Ferrara U. ; INFN, Ferrara) ; Savrie, M. (Ferrara U. ; INFN, Ferrara) ; Scarpa, M. (Ferrara U. ; INFN, Ferrara) ; Wahl, H. (Ferrara U. ; INFN, Ferrara) ; Bizzeti, A. (INFN, Florence) ; Lenti, M. (INFN, Florence) ; Veltri, M. (INFN, Florence) ; Calvetti, M. (Florence U. ; INFN, Florence) ; Celeghini, E. (Florence U. ; INFN, Florence) ; Iacopini, E. (Florence U. ; INFN, Florence) ; Ruggiero, G. (Florence U. ; INFN, Florence) ; Behler, M. (Mainz U., Inst. Phys.) ; Eppard, K. (Mainz U., Inst. Phys.) ; Kleinknecht, K. (Mainz U., Inst. Phys.) ; Marouelli, P. (Mainz U., Inst. Phys.) ; Masetti, L. (Mainz U., Inst. Phys.) ; Moosbrugger, U. (Mainz U., Inst. Phys.) ; Morales Morales, C. (Mainz U., Inst. Phys.) ; Renk, B. (Mainz U., Inst. Phys.) ; Wache, M. (Mainz U., Inst. Phys.) ; Wanke, R. (Mainz U., Inst. Phys.) ; Winhart, A. (Mainz U., Inst. Phys.) ; Coward, D. (Northwestern U.) ; Dabrowski, A. (Northwestern U.) ; Fonseca Martin, T. (Northwestern U.) ; Shieh, M. (Northwestern U.) ; Szleper, M. (Northwestern U.) ; Velasco, M. (Northwestern U.) ; Wood, M.D. (Northwestern U.) ; Cenci, P. (INFN, Perugia) ; Pepe, M. (INFN, Perugia) ; Petrucci, M.C. (INFN, Perugia) ; Anzivino, G. (Perugia U. ; INFN, Perugia) ; Imbergamo, E. (Perugia U. ; INFN, Perugia) ; Nappi, A. (Perugia U. ; INFN, Perugia) ; Piccini, M. (Perugia U. ; INFN, Perugia) ; Raggi, M. (Perugia U. ; INFN, Perugia) ; Valdata-Nappi, M. (Perugia U. ; INFN, Perugia) ; Cerri, C. (INFN, Pisa) ; Fantechi, R. (INFN, Pisa) ; Collazuol, G. (INFN, Pisa) ; DiLella, L. (INFN, Pisa) ; Lamanna, G. (INFN, Pisa) ; Mannelli, I. (INFN, Pisa) ; Michetti, A. (INFN, Pisa) ; Costantini, F. (Pisa U. ; INFN, Pisa) ; Doble, N. (Pisa U. ; INFN, Pisa) ; Fiorini, L. (Pisa U. ; INFN, Pisa) ; Giudici, S. (Pisa U. ; INFN, Pisa) ; Pierazzini, G. (Pisa U. ; INFN, Pisa) ; Sozzi, M. (Pisa U. ; INFN, Pisa) ; Venditti, S. (Pisa U. ; INFN, Pisa) ; Bloch-Devaux, B. (IRFU, Saclay ; CEA, DSM, Saclay) ; Cheshkov, C. (IRFU, Saclay ; CEA, DSM, Saclay) ; Cheze, J.B. (IRFU, Saclay ; CEA, DSM, Saclay) ; De Beer, M. (IRFU, Saclay ; CEA, DSM, Saclay) ; Derre, J. (IRFU, Saclay ; CEA, DSM, Saclay) ; Marel, G. (IRFU, Saclay ; CEA, DSM, Saclay) ; Mazzucato, E. (IRFU, Saclay ; CEA, DSM, Saclay) ; Peyaud, B. (IRFU, Saclay ; CEA, DSM, Saclay) ; Vallage, B. (IRFU, Saclay ; CEA, DSM, Saclay) ; Holder, M. (Siegen U.) ; Ziolkowski, M. (Siegen U.) ; Biino, C. (INFN, Turin) ; Cartiglia, N. (INFN, Turin) ; Marchetto, F. (INFN, Turin) ; Bifani, S. (Turin U. ; INFN, Turin) ; Clemencic, M. (Turin U. ; INFN, Turin) ; Goy Lopez, S. (Turin U. ; INFN, Turin) ; Dibon, H. (Vienna, OAW) ; Jeitler, M. (Vienna, OAW) ; Markytan, M. (Vienna, OAW) ; Mikulec, I. (Vienna, OAW) ; Neuhofer, G. (Vienna, OAW) ; Widhalm, L. (Vienna, OAW)
Publication	2015-05-05
Imprint	02 Apr 2015
Number of pages	8
Note	Revised version accepted for publication in Physics Letter B
In:	Phys. Lett. B 746 (2015) 178-185
DOI	10.1016/j.physletb.2015.04.068
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN SPS ; NA48/2
Free keywords	exotics ; rare decay ; experimental results ; Search for Dark Photon ; Rare pi0 decay
Abstract	A 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.
Copyright/License	Publication: (License: CC-BY-4.0), sponsored by SCOAP³ Preprint: © 2015-2024 CERN, © 2015-2024 The Author(s) (License: CC-BY-4.0)

$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).$ $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).$ $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).$ Show more plots

Corresponding record in: Inspire
Email contact: [email protected]

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