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Weinberger, M; Wester, WC; Whitehouse, B; Whiteson, D; Wicklund, AB; Wicklund, E; Williams, G; Williams, HH; Wilson, P; Winer, BL; Wittich, P; Wolbers, S; Wolfe, C; Wright, T; Wu, X; Wynne, SM; Yagil, A; Yamamoto, K; Yamaoka, J; Yamashita, T; Yang, C; Yang, UK; Yang, YC; Yao, WM; Yeh, GP; Yoh, J; Yorita, K; Yoshida, T; Yu, GB; Yu, I; Yu, SS; Yun, JC; Zanello, L; Zanetti, A; Zaw, I; Zhang, X; Zhou, J; Zucchelli, S; CDF Collaboration; - view fewer (2006) Observation of (BsBs0)-B-0 oscillations. Physical Review Letters , 97 (24) , Article 242003. 10.1103/PhysRevLett.97.242003.

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Abstract

We report the observation of B-s(0)-(B) over bar (0)(s) oscillations from a time-dependent measurement of the B-s(0)-(B) over bar (0)(s) oscillation frequency Delta m(s). Using a data sample of 1 fb(-1) of p (p) over bar collisions at root s = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron, we find signals of 5600 fully reconstructed hadronic B-s decays, 3100 partially reconstructed hadronic B-s decays, and 61 500 partially reconstructed semileptonic B-s decays. We measure the probability as a function of proper decay time that the B-s decays with the same, or opposite, flavor as the flavor at production, and we find a signal for B-s(0)-(B) over bar (0)(s) oscillations. The probability that random fluctuations could produce a comparable signal is 8x10(-8), which exceeds 5 sigma significance. We measure Delta m(s)=17.77 +/- 0.10(stat)+/- 0.07(syst) ps(-1) and extract vertical bar V-td/V-ts vertical bar=0.2060 +/- 0.0007(Delta m(s))(-0.0060)(+0.0081)(Delta m(d)+theor).

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