000001014 001__ 1014
000001014 005__ 20180713094257.0
000001014 037__ $$aBELLE2-POSTER-CONF-2018-002
000001014 041__ $$aeng
000001014 100__ $$aManish Kumar
000001014 245__ $$aMeasurement of the CKM angle phi3 using B->DK at Belle II
000001014 260__ $$aFPCP 2018, Hyderabad,INDIA$$c2018-07-08
000001014 300__ $$amult. p
000001014 520__ $$aThe precise determination of the CKM angle phi3 is highly desirable to scrutinise the consistency of the Standard Model and to probe for the presence of new physics. There have been many efforts by BABAR, Belle and LHCb to measure this angle but due to the small data samples so far produced, phi3 is poorly determined. Hence, a precision measurement of phi3 is required. In this work, the Belle II experimental facility at the SuperKEKB e^+e^− collider will be used, which is the upgraded version of Belle at KEKB; SuperKEKB is an energy-asymmetric e^+e^− collider at KEK Japan. The design luminosity is 8×10^35 cm^−2s^−1 and the Belle II experiment will record a data sample that corresponds to an integrated luminosity of 50 ab^−1, which is a factor of 50 more than the Belle experiment. This data sample will shed light on new physics beyond the Standard Model via high precision measurements of heavy flavor decays and searches for rare signal, including a precision measurement of the CKM angle phi3. In this poster presentation, the preliminary results of Monte Carlo (MC) simulation studies dedicated to the measurement of phi3 using the decay B -> DK, where D -> K0_Spi^+pi^−, will be presented. Further, two important variables the energy difference between the reconstructed energy of BBbar pairs and center-of-mass energy of Υ(4S) deltaE and the beam constrained mass (M_bc) are reconstructed for signal events and the two background: B → Dpi and combinatorial type continuum background. These distributions are further compared for different versions of the reconstruction and background conditions to determine the efficiency of selecting signal events and validate the reconstruction performance for further analysis. Further, an improved precision on the measurement of the CKM angle phi3 by extrapolating the measurement results at integrated luminosity of 50 ab^−1 will also be discussed. This work will give an overview about the status of this analysis.
000001014 6531_ $$aCP Violation
000001014 6531_ $$aCKM angle phi3
000001014 6531_ $$aBelle II
000001014 6531_ $$aSuperKEKB
000001014 700__ $$aKavita Lalwani
000001014 700__ $$aKarim Trabelsi
000001014 700__ $$aPrashant Krishnan
000001014 8560_ $$fmanish.chahal@desy.de
000001014 8564_ $$uhttps://docs.belle2.org/record/1014/files/BELLE2-POSTER-CONF-2018-002.pdf
000001014 8564_ $$uhttps://docs.belle2.org/record/1014/files/BELLE2-POSTER-CONF-2018-002.gif?subformat=icon$$xicon
000001014 8564_ $$uhttps://docs.belle2.org/record/1014/files/BELLE2-POSTER-CONF-2018-002.gif?subformat=icon-700$$xicon-700