arXiv subjects

F. Parodi

Publications and source records attributed to F. Parodi.

23 records · Page 2Linked to original sources

arXiv2001

2000 CKM-Triangle Analysis A Critical Review with Updated Experimental Inputs and Theoretical Parameters

Within the Standard Model, a review of the current determination of the sides and angles of the CKM unitarity triangle is presented, using experimental constraints from the measurements of |ε_K|, |V_{ub}/V_{cb}|, Δm_d and from the limit on Δm_s, available in September 2000. Results from the experimental search for {B}^0_s-\bar{B}^0_s oscillations are introduced in the present analysis using the likelihood. Special attention is devoted to the determination of the theoretical uncertainties. The purpose of the analysis is to infer regions where the parameters of interest lie with given probabilities. The BaBar "95 %, C.L. scanning" method is also commented.

hep-ph↗

arXiv2000

Determination of the CKM unitarity triangle parameters by end 1999

Within the Standard Model, a review of the current determination of the CKM unitarity triangle parameters is presented, using experimental constraints from the measurements of |epsilon_K|, V_ub/V_cb, Delta m_d and from the limit on Delta m_s, available by end 1999.

hep-ph↗

arXiv1999

Constraints on the parameters of the CKM matrix by End 1998

A review of the current status of the Cabibbo-Kobayashi-Maskawa matrix (CKM) is presented. This paper is an update of the results published in [1]. The experimental constraints imposed by the measurements of ε_K, V_{ub}/V_{cb}, Δm_d and from the limit on Δm_d are used. Values of the constraints and of the parameters entering into the constraints, which restrict the range of the \barρ and \barη parameters, include recent measurements presented at 1998 Summer Conferences and progress obtained by lattice QCD collaborations. The results are: \barρ=0.202 ^{+0.053}_{-0.059},\barη=0.340 \pm 0.035, from which the angles α, βand γof the unitarity triangle are inferred : \sin 2 α= -0.26 ^{+ 0.29}_{-0.28} ,\sin 2 β= 0.725 ^{+0.050}_{-0.060} ,γ= (59.5^{+8.5}_{-7.5})^{\circ}. Without using the constraint from ε_K, \sin 2 βhas been obtained: \sin 2 β= 0.72 ^{+0.07}_{-0.11}. Several external measurements or theoretical inputs have been removed, in turn, from the constraints and their respective probability density functions have been obtained. Central values and uncertainties on these quantities have been compared with actual measurements or theoretical evaluations. In this way it is possible to quantify the importance of the different measurements and the coherence of the Standard Model scenario for CP violation. An important result is that Δm_s is expected to be between [12.0-17.6] ps^{-1} with 68% C.L. and <20 ps^{-1} at 95% C.L. Finally relations between the CKM parameters and the quark masses are examined within a given model.

hep-ex↗

arXiv1998

Constraints on the parameters of the $V_{CKM}$ matrix at the end of 1997

A review of the current status of the Cabibbo-Kobayashi-Maskawa matrix V_CKM is presented. This paper contains an update of the results published in hep-ph/9711261. Values of the parameters entering into the constraints, which restrict the range for rho and eta parameters, include recent measurements given at 1997 Summer Conferences and progress obtained by lattice QCD collaborations.Experimental constraints imposed by the measurements of epsilon_k,V_ub/V_cb, Delta m_d and by the limit on Delta m_s, are compatible and do not show evidence for New Physics inside measurements errors. Values for the angles alpha, beta and gamma of the C.K.M. triangle have been also obtained: rho=0.156 +- 0.090, eta=0.328 +- 0.054 sin 2alpha = -0.10+-0.40, sin 2beta = 0.68 +- 0.10, gamma= 64+-12 Angles theta,theta_u,theta_d and phi proposed in the parametrisation (Phys. Lett. B5353 (1995) 114.) of the C.K.M. matrix have been also determined. Finally, as there are more constraints than the fitted rho and eta parameters, several external measurements or theoretical inputs have been removed, in turn, from the constraints and their respective values have been fitted simultaneously with rho and eta.Central values and uncertainties on these quantities have been compared with actual measurements or theoretical evaluations. In this way it is possible to quantify the importance of the different measurements and the coherence of the Standard Model scenario for CP violation.

hep-ph↗

arXiv1997

Measurements of the $ρ$ and $η$ parameters of the $V_{CKM}$ matrix and perspectives

A review of the current status of the Cabibbo-Kobayashi-Maskawa matrix ($V_{CKM}$) is presented and a special emphasis is put on the determination of the $ρ$ and $η$ parameters. From this study it follows that, in the Standard Model, the $B^0_s$-$\bar{B^0_s}$ oscillation frequency, $Δm_s$, has to lie, with 68% C.L., between 6.5 ps$^{-1}$ and 15 ps$^{-1}$, and is below 21 ps$^{-1}$ at 95% C.L. If the interest of measuring $Δm_s$ is underlined, the importance of a precise determination of the B meson decay constant, $f_B$, is also stressed. It is proposed to obtain a precise value for this parameter from an accurate measurement of $f_D$, the D meson decay constant, using results from lattice QCD to relate D and B hadrons. A future Tau-Charm factory could accomplish this task. It is also shown that from the present measurements, assuming the validity of the Standard Model, an already accurate value of $sin 2β~=~ 0.67 ^{+0.12}_{-0.13}$ is obtained. Sofar no constraint can be obtained on $sin 2α$. The interest of having a direct measurement of $sin 2α$ and $sin 2β$ at B-factories or at other facilities is reminded. Finally constraints on SUSY parameters, in the framework of a given model, obtained from a precise measurement of the CKM matrix elements are analyzed.

hep-ph↗