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We argue, following our earlier works (the "CEBZMC model"), that thephenomenon of twin peak high frequency quasi-periodic oscillations (QPOs)observed in black hole X-ray binaries is caused by magnetic coupling (MC)between accretion disk and black hole (BH). Due to MC, two bright spots occurat two separate radial locations r_{in} and r_{out} at the disk surface,energized by a kind of the Blandford-Znajek mechanism (BZ). We assume,following the Kluzniak-Abramowicz QPO resonance model, that Keplerianfrequencies at these two locations are in the 3:2 ratio. With this assumption,we estimate the BH spins in several sources, including GRO J1655-40, GRS1915+105, XTE J1550-564, H1743-322 and Sgr A*. We give an interpretation of the"jet line" in the hardness-intensity plane discussing the parameter spaceconsisting of the BH spin and the power-law index for the variation of thelarge-scale magnetic field in the disk. Furthermore, we propose a new scenariofor the spectral state transitions in BH X-ray binaries based on fluctuation indensities of accreting plasma from a companion star.Comment: 17 pages, 6 figures, accepted by AP

Correlation between 3 : 2 QPO Pairs and Jets in Black Hole X‐Ray Binaries