6533b7d7fe1ef96bd1267926

RESEARCH PRODUCT

Search for the decayD0→γγand measurement of the branching fraction forD0→π0π0

H. L. LynchT. SchalkL. PiemonteseGiulia CasarosaM. A. MazzoniG. WormserJ. R. FryP. PatteriC. H. ChengD. M. StromE. GabathulerW. R. InnesF. C. PorterD. J. AsgeirssonR. De SangroS. L. WuX. C. LouJ. J. WalshT. SchroederChristopher WestB. BhuyanB. G. FulsomT. E. LathamB. N. RatcliffYu I. SkovpenW. DunwoodieR. EckmannW. H. TokiR. SchwierzA. M. LutzW. J. WisniewskiD. N. BrownC. HeartyH. AhmedO. HamonC. C. YoungS. PassaggioElisa GuidoW. T. MeyerB. C. WrayA. RoodmanD. J. SummersJ. L. RitchieP. LundCorrado AngeliniStephen SekulaM. K. SullivanE. FioravantiT. PulliamA. CalcaterraH. AtmacanG. D. LaffertyM. FritschA. M. EisnerMatteo RamaG. LynchMarcello RotondoM. SigamaniD. A. MilanesM. L. KocianH. SchröderS. LuitzV. SantoroSw. BanerjeeL. M. CremaldiM. BellisD. Lopes PegnaA. KhanM. TibbettsS. PrellT. LueckD. LindemannGabriele SimiJames H CochranG. Hamel De MonchenaultC. L. DavisRoland WaldiA. M. RulandD. S. BaileyS. ParamesvaranR. J. SobieD. SuV. P. DruzhininC. BozziF. FerroniV. PoireauR. C. FieldM. BondioliH. B. CrawleyM. PiccoloK. HonscheidC. A. ChavezP. C. BloomL. VitaleM. MuneratoHeiko LackerD. G. HitlinM. V. PurohitV. B. GolubevB. LindquistS. StrackaA. LusianiA. StocchiD. P. StokerG. FinocchiaroM. S. DubrovinV. LuthC. BuengerJ. AlbertA. LazzaroP. J. ClarkMarco BombenA. JawaheryClaudio CampagnariG. CibinettoR. AndreassenF. Martinez-vidalDominik MüllerM. S. AlamPaul Fraser HarrisonA. J. MartinezG. BatignaniM. PosoccoF. FortiH. W. WulsinT. M. HongNicola NeriA. SnyderM. WittgenA. AdametzA. OyangurenChunhui ChenMatteo NegriniW. F. WangEnrico RobuttiP. OngmongkolkulE. FeltresiP. M. PatelV. E. BlinovM. MandelkernF. F. WilsonDouglas WrightR. CenciBruce SchummJ. P. MorrisD. BettoniE. Ben-haimP. TarasE. P. SolodovA. P. OnuchinI. BinghamStephen Robert WagnerJ. ChauveauE. I. RosenbergG. RizzoA. P. WagnerMauro MorandinC. O. VuosaloP. LewisK. R. SchubertA. ZalloK. Yu TodyshevM. H. SchuneF. AnulliU. UwerH. A. NealS. BettariniD. MonorchioF. SimonettoR. H. SchindlerR. StroiliB. OberhofM. J. LewczukM. GasperoJ. P. ColemanAlessandro GazE. PrencipeA. PalanoG. R. BonneaudG. P. Dubois-felsmannS. H. RobertsonC. TouramanisI. OfteI. GarziaD. H. WrightE. A. KravchenkoX. NguyenS. EmeryC. PatrignaniShu LiV. TisserandP. D. DaunceyR. AyadAndrea Rodriguez PerezJames R. WilsonH. BriandT. HartmannHerbert KochS. CurryC. J. SchillingAndrei GritsanCrisostomo SciaccaD. AstonI. M. NugentA. HafnerJ. Garra TicoB. SpaanDmytro KovalskyiJ. KrosebergG. CavotoR. KroegerJ. P. LeesW. GradlA. G. DenigD. W. G. S. LeithEleonora LuppiM. J. KobelW. ParkS. M. SpanierN. GagliardiG. De NardoL. LanceriV. LombardoJ. E. BrauD. R. PeimerA. R. BuzykaevC. LuG. EigenA. N. YushkovR. ContriE. SalvatiM. NicolaciV. ZieglerP. KimB. EchenardR. FreyM. H. KelseyD. BernardR. M. WhiteC. L. LeeM. Franco SevillaYu. G. KolomenskyM. VerderiM. DavierG. CalderiniC. CartaroU. MallikD. DujmicT. S. MiyashitaElisa ManoniG. M. VitugE. GraugesG. SciollaMario GiorgiM. EbertAlessandro RossiS. PlayferAidan Randle-condeD. E. HutchcroftC. DallapiccolaT. LeddigB. HamiltonH. R. BandW. S. LockmanSridhara DasuM. R. ConveryM. L. PerlZ. J. GuoA. V. TelnovN. Lopez-marchA. J. EdwardsJoseph IzenPhilippe GrenierS. SittD. A. DollM. T. GrahamS. PacettiY. B. PanR. KowalewskiColin JessopA. Y. RakitinR. CowanR. PrepostP. RoudeauS. NelsonDenis DerkachP. BiassoniJ. E. WatsonE. O. OlaiyaM. SchramF. PalomboM. CarpinelliJames D. OlsenMaurizio BiasiniB. MalaescuL. T. KerthOwen Rosser LongA. SeidenM. WeaverR. Baldini-ferroliT. S. MattisonJ. A. ErnstD. KirkbyL. SunG. VasseurK. T. FloodAlberto CervelliAdrian John BevanC. HastD. J. LangeG. PireddaR. FacciniF. FerrarottoA. J. LankfordF. Le DiberderM. MoriiT. J. GershonJ. D. RichmanI. M. PeruzziS. I. SerednyakovF. BianchiA. E. RubinG. JacksonJ. DorfanJ. MarksPh LerusteN. ArnaudG. A. CowanL. Li GioiA. K. YarrituA. M. GabareenJ. Va’vraW. T. FordK. E. AlwynD. J. BardTim AdyeR. D. KassM. PappagalloD. GambaMaria A. NagelMaurizio MartinelliP. SonnekN. GuttmanK. J. KnoepfelJ. M. RoneyB. StuguJ. G. SmithE. M.t. PuccioG. MarchioriF. Di LodovicoHyun-chul KimD. J. PayneR. GodangU. NauenbergPrafulla Kumar BeheraV. PrasadRoberto CalabreseJ. OcarizJ. W. GaryR. GorodeiskyD. A. RobertsG. GrosdidierH. H. F. ChoiJ. M. LoseccoN. B. SinevR. F. SchwittersRoger BarlowMartino MargoniF. U. BernlochnerD. B. MacfarlaneG. J. KingA. A. SalnikovG. OnoratoE. TorrenceB. T. MeadowsG. RavenM. D. SokoloffP. R. BurchatAbner SofferCh YècheC. LindsayF. LiuMaria Roberta MongeR. SaccoJ. A. MckennaE. PaoloniH. L. SnoekR. BartoldusJ. F. BenitezA. J.s. SmithM. Lo Vetere

subject

PhysicsNuclear and High Energy PhysicsParticle physicsLuminosity (scattering theory)PhotonMeson010308 nuclear & particles physicsBranching fraction01 natural sciences3. Good healthlaw.inventionNuclear physicsPionlaw0103 physical sciencesLimit (mathematics)010306 general physicsColliderOrder of magnitude

description

We search for the rare decay of the D^0 meson to two photons, D^0→γγ, and present a measurement of the branching fraction for a D^0 meson decaying to two neutral pions, B(D^0→π^0π^0). The data sample analyzed corresponds to an integrated luminosity of 470.5  fb^(-1) collected by the BABAR detector at the PEP-II asymmetric-energy e^+e^- collider at SLAC. We place an upper limit on the branching fraction, B(D^0→γγ)<2.2×10^(-6), at 90% confidence level. This limit improves on the existing limit by an order of magnitude. We also find B(D^0→π^0π^0)=(8.4±0.1±0.4±0.3)×10^(-4).

https://doi.org/10.1103/physrevd.85.091107