The Constraint On New Physics By The Experimental Result Of LHCb

The universe is made by the basic fermions and their forces. In the standard model (SM),the basic fermions include quarks and leptons, and their forces include the strong, weak, elec-tromagnetic, gravitational interaction and Higgs boson interaction as well. The SM is a verysuccessful theory and has past all experimental tests, but it is widely believed that it is not acomplete theory. There are some important problems which can not be answered by it, likehierarchy problem, flavor problem, matter and antimatter asymmetry of the universe, and darkmatter/dark energy problem, etc. Therefore, the SM is just a low-energy effective theory ofsome more fundamental theories and it is well motivated to study the new physics beyond theSM.B physics belongs to the high precision frontiers of particle physics and has been one of thehot topics and cutting-edge research fields. To explore new physics beyond the SM is one of thegoals of B physics research. The collaborations of the Large Hadron Collider have accumulated ahuge dataset and have made great discoveries. For example, in July2012, the ATLAS and CMScollaborations have claimed the discovery of a Higgs boson with a mass126GeV. Meanwhile,the LHCb collaboration has accumulated a31dataset at2×3.5and2×4TeV center ofmass energy, and have performed a few precise measurements of B rare decays. Obviously,the experimental results of the LHCb is of great significance for the study of the new physicalmodels. For example, the forward-backward asymmetry, branching ratio, isospin asymmetry,angular distribution ofâ†'(*)+can have a great deviation from the SM in some newphysics models. Therefore, these rare decays are good places to explore and test new physicsmodels.In literature, the flavor changing neutral current processes of B hadrons have been studiedin various new physics models. Supersymmetric model is one of well-motivated candidates for new physics. In this work, using the light-cone sum rules, we study the constraint onthe supersymmetric models by the experimental results of the forward-backward asymmetry,branching ratio, isospin asymmetry and angular distribution measurements fromâ†'(*)+decay, where the effects of supersymmetric models are parameterized by two Wilson coefficients1and2. We found that Wilson coefficients have been greatly constrained by the LHCbexperimental data.