Observation ofB→K*ℓ+ℓ−

Abstract

We report the observation of the flavor-changing neutral current decay B-->K(*)l(+)l(-) and an im-proved measurement of the decay B-->Kl(+)l(-), where l represents an electron or a muon, with a data sample of 140 fb(-1) accumulated at the Upsilon(4S) resonance with the Belle detector at KEKB. The results for the branching fractions are B(B-->K(*)l(+)l(-))=(11.5(+2.6)(-2.4)+/-0.8+/-0.2)x10(-7) and B(B-->Kl(+)l(-))=(4.8(+1.0)(-0.9)+/-0.3+/-0.1)x10(-7), where the first error is statistical, the second is systematic and the third is from model dependence.

Untitled

“…The inclusive B → X s + − decay is observed in BaBaR [3] and Belle collaborations. Also, these collaborations measured exclusive modes B → K + − [4,5,6] and B → K * + − [7]. The experimental results on these decays are in good agreement with theoretical estimations [8,9,10] which can be used to constrain new physics (NP) effects.…”

“…With a sequential fourth generation, the Wilson coefficients C 7 C 9 and C 10 receive contributions from the t quark loop, which we will denote as C new 7,9,10 . Because the sequential fourth generation couples in a similar way to the photon and W , the effective Hamiltonian relevant for b → s + − decay has the following form…”

RI‐MP3 calculations of biomolecules based on the fragment molecular orbital method

“…The combination of the FMO method with the RI approximation is expected to be a highly potent approach to reduce the computational cost for the electron correlation of large molecules. Actually, several FMO calculations of the MP2 energy [33][34][35] and gradient [36] have been performed using the RI approximation. For example, Ishikawa and Kuwata [33] first reported the FMO-RI-MP2 calculation of biomolecules, demonstrating that the MP2 correlation energy can be obtained with only a 20% increase in the computational time as compared to the FMO-RHF.…”

“…Actually, several FMO calculations of the MP2 energy [33][34][35] and gradient [36] have been performed using the RI approximation. For example, Ishikawa and Kuwata [33] first reported the FMO-RI-MP2 calculation of biomolecules, demonstrating that the MP2 correlation energy can be obtained with only a 20% increase in the computational time as compared to the FMO-RHF. However, the use of the RI approximation in the FMO scheme is currently limited to the MP2 method.…”

Predicting stability limits for pure and doped dicationic noble gas clusters undergoing coulomb explosion: A parallel tempering based study

“…High quality empirical PES exists for these systems and they have been used on numerous occasions by the community which uses molecular dynamics or Monte-Carlo procedures. [15][16][17][18][19][20][21][22][23][24][25] Among the many phenomena that clusters exhibit, Coulomb explosion [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] (CE) has received attention from many workers. A cluster containing multiple positive or negative charges can fragment on account of its strong Coulomb repulsion into smaller parts.…”