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Search for the decay modes D0→e +e -, D0→μ +μ -, and D0→e ±μ∓

  • Author(s): Lees, JP
  • Poireau, V
  • Tisserand, V
  • Garra Tico, J
  • Grauges, E
  • Palano, A
  • Eigen, G
  • Stugu, B
  • Brown, DN
  • Kerth, LT
  • Kolomensky, YG
  • Lynch, G
  • Koch, H
  • Schroeder, T
  • Asgeirsson, DJ
  • Hearty, C
  • Mattison, TS
  • McKenna, JA
  • So, RY
  • Khan, A
  • Blinov, VE
  • Buzykaev, AR
  • Druzhinin, VP
  • Golubev, VB
  • Kravchenko, EA
  • Onuchin, AP
  • Serednyakov, SI
  • Skovpen, YI
  • Solodov, EP
  • Todyshev, KY
  • Yushkov, AN
  • Bondioli, M
  • Kirkby, D
  • Lankford, AJ
  • Mandelkern, M
  • Atmacan, H
  • Gary, JW
  • Liu, F
  • Long, O
  • Mullin, E
  • Vitug, GM
  • Campagnari, C
  • Hong, TM
  • Kovalskyi, D
  • Richman, JD
  • West, CA
  • Eisner, AM
  • Kroseberg, J
  • Lockman, WS
  • Martinez, AJ
  • Schumm, BA
  • Seiden, A
  • Chao, DS
  • Cheng, CH
  • Echenard, B
  • Flood, KT
  • Hitlin, DG
  • Ongmongkolkul, P
  • Porter, FC
  • Rakitin, AY
  • Andreassen, R
  • Huard, Z
  • Meadows, BT
  • Sokoloff, MD
  • Sun, L
  • Bloom, PC
  • Ford, WT
  • Gaz, A
  • Nauenberg, U
  • Smith, JG
  • Wagner, SR
  • Ayad, R
  • Toki, WH
  • Spaan, B
  • Schubert, KR
  • Schwierz, R
  • Bernard, D
  • Verderi, M
  • Clark, PJ
  • Playfer, S
  • Bettoni, D
  • Bozzi, C
  • Calabrese, R
  • Cibinetto, G
  • Fioravanti, E
  • Garzia, I
  • Luppi, E
  • Munerato, M
  • Piemontese, L
  • Santoro, V
  • Baldini-Ferroli, R
  • Calcaterra, A
  • De Sangro, R
  • Finocchiaro, G
  • Patteri, P
  • Peruzzi, IM
  • Piccolo, M
  • Rama, M
  • Zallo, A
  • Contri, R
  • et al.
Abstract

We present searches for the rare decay modes D0→e +e -, D0→μ +μ -, and D0→e ±μ ∓ in continuum e +e -→cc̄ events recorded by the BABAR detector in a data sample that corresponds to an integrated luminosity of 468fb -1. These decays are highly Glashow-Iliopoulos-Maiani suppressed but may be enhanced in several extensions of the standard model. Our observed event yields are consistent with the expected backgrounds. An excess is seen in the D0→μ +μ - channel, although the observed yield is consistent with an upward background fluctuation at the 5% level. Using the Feldman-Cousins method, we set the following 90% confidence level intervals on the branching fractions: B(D0→e +e -)<1. 7×10 -7, B(D0→μ +μ -) within [0.6,8.1]×10 -7, and B(D0→e ±μ ∓)<3.3×10 -7. © 2012 American Physical Society.

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