t'ai chi exercise can reduce the level of blood pressure in young and middle-aged in-service staff with grade 1 hypertension, control weight, slow down the HR, improve metabolism, and improve quality of life. t'ai chi is an exercise suitable for in-service hypertension subjects.

We have studied the masses for fully open-flavor tetraquark states bcqs and scqb (q = u, d) with quantum numbers J P = 0 + , 1 + . We systematically construct all diquark-antiquark interpolating currents and calculate the two-point correlation functions and spectral densities in the framework of QCD sum rule method. Our calculations show that the masses are about 7.1 − 7.2 GeV for the bcqs tetraquark states and 7.0 − 7.1 GeV for the scqb tetraquarks. The masses of bcqs tetraquarks are below the thresholds ofB s D andB * s D final states for the scalar and axialvector channels respectively. The scqb tetraquark states with J P = 1 + lie below the B + c K * and B * s D thresholds. Such low masses for these possible tetraquark states indicate that they can only decay via weak interaction and thus are very narrow and stable.

A comprehensive revisit of the ρ meson with improved Monte-Carlo based QCD sum rules * Qi-Nan Wang( ) 1 Zhu-Feng Zhang( ) 1,2;1) T. G. Steele 2 Hong-Ying Jin( ) 3 Zhuo-Ran Huang( ) 2,3

We have calculated the mass spectra for the molecular states and tetraquark states with . The masses of the axial-vector , molecular states and , tetraquark states are predicted to be approximately 3.98 GeV, in good agreement with the mass of from BESIII. In both the molecular and diquark-antidiquark scenarios, our results suggest that there may exist two almost degenerate states, as the strange partners of and . We propose to carefully examine in future experiments to verify this. One may also search for more hidden-charm four-quark states with strangeness in not only the open-charm channels but also the hidden-charm channels , .

We investigate the exotic dibaryon states with and in a molecular picture. We construct a tensor molecular interpolating current and calculate the two-point correlation function within the method of QCD sum rules. Our calculations indicate that the masses of the scalar and tensor dibaryon states are and , respectively, which are below the threshold. Within error, these results do not negate the existence of loosely bound molecular dibaryon states. These exotic strangeness and doubly-charged dibaryons, if they exist, may be identified in heavy-ion collision processes in the future.