Studies of dark sector particles at belle

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We show recent results of dark photon and dark-sector particles at Belle. In particular, we present the following searches: For dark photon and dark Higgs via Higgsstrahlung, for a dark gauge boson coupling predominantly to quarks in η decays, and for D0 decays to invisible final states. The data are produced in e+e collisions at the KEKB asymmetric-energy collider and collected with the Belle detector.

Original languageEnglish
JournalProceedings of Science
Publication statusPublished - 2017
Event2017 European Physical Society Conference on High Energy Physics, EPS-HEP 2017 - Venice, Italy
Duration: 2017 Jul 52017 Jul 12

Bibliographical note

Funding Information:
inatesourceins ofthethe decaysystematchainic errorDa∗r+e t→he Dint0e(gr→ateKd 0luηm)ipi-+ [9].ThephotonsinηdecaysareselectedbySINET4 network support.We acknowledge support nosity: 1%, branching fraction: 4%, track identificSation: from MEXT, JSPS and Nagoya’s TLPRC (Japan); ARC requiring E > 60 (100) MeV in the barrel (endcap) regions and the electromagnetic shower shape beficiconsistentency: 15%, bwithackgrouthatnd eofstimphotationons.: 10%Inanaddition,d initial-werequirethephotonnottobeassociatedwith(Czechia); CZF, DFG, andVS (Germany); DST (India); stat0e radiation: 15%. All the systematic errors are added BK21Plus(Korea);MNiSWandNCN(Poland);MESINFN (Italy);MOE,MSIP, NRF,GSDCofKISTI,and a pi when combined with any other photon in the event. The momenta of η daughters are refit inquadratureandamountintotalto25%. and RFAAE0(Russia); ARRS (Slovenia); IKERBASQUE byIcnosnumstmraairnyi,nwgestehaercηhedmfoarstshteodathrkepnhootmoninaanldodanrek. Candidate K mesons are selected using a neural Higgs in the mass ranges 0.1 –0 3.5 GeV/c2 and 0.2 – MOE (Taiwan); and DOE and NSF (USA). We would network technique2 [10]. KS and η mesons are combined and fitted to a common vertex to form a 0010.5GeV/c ,respectively. Nosignificantsignalwasob- also like to than0 k Bernard Echn+ard for discussing the Dser,vewd.ithWethoebtmainasisndcivoindsutarlaainndedcotmobtinheednuopmpeirn(a9l0D% mass. This D and a slow pi are combined and CL) limits on the product of branching fraction∗ti+mes the els for MadGraph. fitted to the interaction point to find a D . BornF,iagnudreon3(tah)esphroodwusctthoefdMarpik+ppih−oγtodnisctoriubpulintigontofromDBorncrosssection,B⇥Born,ontheBorncrosssection,0→K0pi+pi−γ.WeobtainNη=2974±90

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