Search for single-top production in ep collisions at HERA

preprint2012arXivOpen access
ZEUS CollaborationH. AbramowiczI. AbtL. AdamczykM. AdamusR. AggarwalS. AntonelliP. AntonioliA. AntonovM. ArneodoV. AushevY. AushevO. BachynskaA. BambergerA. N. BarakbaevG. BarbagliG. BariF. BarreiroN. BartosikD. BartschM. BasileO. BehnkeJ. BehrU . BehrensL. BellagambaA. BertolinS. BhadraM. BindiC. BlohmV. BokhonovT. BołdK. BondarenkoE. G. BoosK. BorrasD. Boscher iniD. BotI. BrockE. BrownsonR. BrugneraN. BrümmerA. BruniG. BruniB. BrzozowskaP. J. BusseyB. BylsmaA. CaldwellM. CapuaR. CarlinC. D. CatterallS. ChekanovJ. ChwastowskiJ. CiborowskiR . CiesielskiL. CifarelliF. CindoloA. ContinA. M. Cooper-SarkarN. CoppolaM. CorradiF. CorriveauM. CostaG. D'AgostiniF. Dal CorsoJ. del PesoR. K. DementievS. De PasqualeM. DerrickR. C. E. DevenishD. DoburB. A. DolgosheinG. DolinskaA. T. DoyleV. DrugakovL. S. DurkinS. DusiniY. EisenbergP. F. ErmolovA. EskreysS. FangS. FazioJ. FerrandoM. I. FerreroJ. FigielM. ForrestB. FosterG. GachA. GalasE. GalloA. GarfagniniA. GeiserI. GialasL. K. GladilinD. GladkovC. GlasmanO. GogotaYu. A. GolubkovP. GöttlicherI. Grabowska-BołdJ. GrebenyukI. GregorG. GrigorescuG. GrzelakO. GuetaM. GuzikC. GwenlanT. HaasW. HainR. HamatsuJ. C. HartH. HartmannG. HartnerE. HilgerD. HochmanR. HoriK. HortonA. HüttmannZ. A. IbrahimY. IgaR. IngbirM. IshitsukaH. -P. JakobF. JanuschekT. W. JonesM. JüngstI. KadenkoB. KahleS. KananovT. KannoU. KarshonF. KarstensI. I. KatkovM. KaurP. KaurA. KeramidasL. A. KheinJ. Y. KimD. KisielewskaS. KitamuraR. KlannerU. KleinE. KoffemanP. KooijmanIe. KorolI. A. KorzhavinaA. KotańskiU. KötzH. KowalskiO. KuprashM. KuzeA. LeeB. B. LevchenkoA. LevyV. LibovS. LimentaniT. Y. LingM. LisovyiE. LobodzinskaW. LohmannB. LöhrE. LohrmannK. R. LongA. LonghinD. LontkovskyiO. Yu. LukinaJ. MaedaS. MagillI. MakarenkoJ. MalkaR. MankelA. MargottiG. MariniJ. F. MartinA. MastroberardinoM. C. K. MattinglyI. -A. Melzer-PellmannS. MergelmeyerS. MiglioranziF. Mohamad IdrisV. MonacoA. MontanariJ. D. MorrisK. MujkicB. MusgraveK. NaganoT. NamsooR. NaniaA. NigroY. NingT. NobeU. NoorD. NotzR. J. NowakA. E. Nuncio-QuirozB. Y. OhN. OkazakiK. OliverK. OlkiewiczYu. OnishchukK. PapageorgiuA. ParentiE. PaulJ. M. PawlakB. PawlikP. G. PelferA. PellegrinoW. PerlańskiH. PerreyK. PiotrzkowskiP. PlucińskiN. S. PokrovskiyA. PoliniA. S. ProskuryakovM. PrzybycieńA. RavalD. D. ReederB. ReisertZ. RenJ. RepondY. D. RiA. RobertsonP. RoloffI. RubinskyM. RuspaR. SacchiA. SaliiU. SamsonG. SartorelliA. A. SavinD. H. SaxonM. SchioppaS. SchlenstedtP. SchleperW. B. SchmidkeU. SchneeklothV. SchönbergT. Schörner-SadeniusJ. SchwartzF. SciulliL. M. ShcheglovaR. ShehzadiS. ShimizuI. SinghI. O. SkillicornW. SłomińskiW. H. SmithV. SolaA. SolanoD. SonV. SosnovtsevA. SpiridonovH. StadieL. StancoA. SternT. P. StewartA. StifutkinP. StopaS. SuchkovG. SusinnoL. SuszyckiJ. Sztuk-DambietzD. SzubaJ. SzubaA. D. TapperE. TassiJ. TerrónT. TheedtH. TieckeK. TokushukuO. TomalakJ. TomaszewskaT. TsurugaiM. TurcatoT. TymienieckaM. VázquezA. VerbytskyiO. ViazloN. N. VlasovO. VolynetsR. WalczakW. A. T. Wan AbdullahJ. J. WhitmoreL. WiggersM. WingM. WlasenkoG. WolfH. WolfeK. WronaA. G. Yagües-MolinaS. YamadaY. YamazakiR. YoshidaC. YoungmanA. F. ŻarneckiL. ZawiejskiO. ZenaievW. ZeunerB. O. ZhautykovN. ZhmakC. ZhouA. ZichichiZ. ZolkapliM. ZolkoD. S. Zotkin

Abstract

A search for single-top production, ep→etXep \rightarrow etX, has been performed with the ZEUS detector at HERA using data corresponding to an integrated luminosity of $0.37\fbi$. No evidence for top production was found, consistent with the expectation from the Standard Model. Limits were computed for single-top production via flavour changing neutral current transitions. The result was combined with a previous ZEUS result yielding a total luminosity of 0.50fb-1. A 95% credibility level upper limit of 0.13 pb was obtained for the cross section at the centre-of-mass energy of $\sqrt{s}=315\gev$.

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