Investigation of the decays B0d,s-> J/yh in the ATLAS experiment at the LHC C. D

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Investigation of the decays B0d,s-> J/yh in the ATLAS experiment at the LHC C. D

Galli, Michael, Founder;Editor; President has reference to this Academic Journal, PHwiki organized this Journal Investigation of the decays B0d,s-> J/yh in the ATLAS experiment at the LHC C. Driouichi, P.Eerola, Lund M. Melcher, F. Ohlsson-Malek, S. Viret, Grenoble Physics background Decays B0s->J/yf, B0s ->J/yh(’), B0s ->D+sD-s are analogous, but up to now, only the first one has been studied Advantages of B0s->J/yh: no angular analysis needed since the final state is a CP eigenstate (V-PS) Cross-check of the decay mode B0s->J/yf CP asymmetry: in the St in addition to ard Model, the CP asymmetry is predicted to be theoretically ”clean”, but very small, where l=sinqC, qC is the Cabibbo angle, h is the heigth of the Unitarity Triangle, in addition to g is one of the angles of the UT. Measurements Branching ratio Decay is not yet observed, exp. upper limit BR<3.8 10-3 Bs lifetime in addition to other parameters If large CP violation is observed => New Physics! For example, LR-symmetric models with spontaneous CP violation predict CP asymmetry O(40%)[Ball, Fleischer] (SM: 4%) BR predictions: BR=(8.3-9.5) 10-4 [Sk in addition to s]. Uncertainty from h-h’ mixing. Direct measurement of angle g using Bs in addition to Bd decays to J/yh

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J/y reconstruction J/y->m+m- selected with pT(m1)>5 GeV, pT(m2)>3 GeV => passes level-1 in addition to level-2 triggers efficiency: 85% as long as m1 (incl. level-1 in addition to reconstruction in muon spectrometer), 78% as long as m2 (incl. Reconstruction in muon spectrometer in addition to tilecal). Fake rate is very small. J/y reconstruction: vertexing with c2/NDF<6, transverse decay length > 250 mm => mass res. 39 MeV, rec. eff. 79%. h reconstruction h->gg reconstruction in the ATLAS LAr calorimeter: cell size 0.025×0.025 (DhxDf) in the second sampling layer further selection: cuts on energy sharing in the 3 ECAL layers in addition to HCAL cluster width energy containment in the 3×3 window => mass resolution 35 MeV, efficiency 2.3%, background 28% energy resolution (s(E)/E)2=(0.10/sqrt(E))2 + (0.01)2 (E in GeV) clusterization of 3×3 cells with 1 GeV threshold => if E(g)< 1 GeV => photon lost => if gg opening angle < 5o => two clusters merge to 1 => rejected 20% of h->gg retained B0s,(d) reconstruction J/y in addition to h c in addition to idates combined, using mass constraints. s(B0s,d)= 67 MeV.

Results as long as 30 fb-1 Background considered: b->J/yX Clear Bs signal Bd CANNOT be observed CP asymmetry Events need to be tagged as B or anti-B Use jet-charge tagging with 57% efficiency, 37% wrong-tag fraction Fit: where D is dilution from background in addition to wrong tags. d(sinfM) = 0.27 (xs = Dms/Gs=19), 0.31 (xs=30) Only very large asymmetries can be observed Comparisons in addition to conclusions Simple estimates: B-factories PEPII, KEKB cannot produce Bs Tevatron 2 fb-1: CDF 190 Bs->J/yh LHC ATLAS 30 fb-1: 9700 Bs->J/yh LHC LHCb 10 fb-1: 260 000 Bs ->J/yh, 2150 Bd->J/yh ATLAS can see a clear signal of Bs->J/yh, measure BR in addition to other parameters: measurement in addition to cross-check. Note ISN-01.68, LUNDF6/(NFFL-7198)2001 submitted as long as publication. Improve statistics by investigating h->p+p-p0 (BR=23%) improve h efficiency by better use of the fine granularity of the first ECAL sampling (cluster fine structure)

Galli, Michael Redjellyfish.com Founder;Editor; President www.phwiki.com

Galli, Michael Founder;Editor; President

Galli, Michael is from United States and they belong to Redjellyfish.com and they are from  Mountain View, United States got related to this Particular Journal. and Galli, Michael deal with the subjects like Conservation; Environment

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