CP and charge asymmetries at CDF Page: 1 of 3
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CP and charge asymmetries at CDF
Michael Morello for the CDF Collaboration
University and I.N.F.N of Pisa - Ed. C, Polo Fibonacci, Largo B. Pontecorvo, 3 - 56127 Pisa,
Abstract. We present CDF results on the branching fractions and time-integrated direct CP
asymmetries for B0 and B decay modes into pairs of charmless charged hadrons (pions or
kaons). We report also the first observation of B -> DJZK' mode and the measurement of its
The interpretation of the CP violation mechanism is one of the most controversial aspects of
the Standard Model. Many extensions of Standard Model predict that there are new sources of
CP violation, beyond the single Kobayashi-Maskawa phase in the quark-mixing matrix (CKM).
Considerations related to the observed baryon asymmetry of the Universe imply that such new
sources should exist. The non-leptonic decays of B mesons are effective probes of the CKM
matrix and sensitive to these potential new physics effects. The large production cross section
of B hadrons of all kinds at the Tevatron allows extending such measurements to B decays,
which are important to supplement our understanding of B0 meson decays.
The B2 -> K-r+ mode could be used to measure y  and its CP asymmetry could be
a powerful model-independent test of the source of direct CP asymmetry in the B system .
This may provide useful information to solve the current discrepancy between the asymmetries
observed in the neutral ACP(B0 -> K+7-) and charged mode ACP(B+ -> K+o) . A time-
dependent, flavor-tagged measurement of B -> DSFK can provide a measurement of y in a
theoretically clean way .
Throughout this paper, C-conjugate modes are implied and branching fractions indicate CP-
averages unless otherwise stated.
2. Measurements of Bps) -> h+h'- decays
The Collider Detector at Fermilab (CDF) experiment analysed an integrated luminosity f Cdt ~
1 fb-1 sample of pairs of oppositely-charged particles and reconstructed a sample of 14,500
B0s) -> h+h'- decay modes (where h = K or 7) after the off-line confirmation of trigger
requirements. In the off-line analysis, we chose the selection cuts minimizing the expected
uncertainty of the physics observables to be measured (through several "pseudo-experiments").
We used two different sets of cuts, respectively optimized to measure the CP asymmetry
.ACP(B0 -> K+7-) (loose cuts) and to improve the sensitivity for discovery and limit setting 
of the not yet observed B -> K-r+ mode. The resolution in invariant mass and in particle
identification (dE/dx) is not sufficient for separating the individual B0S) -> h+h'- decay modes
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Morello, Michael & /Pisa U. /INFN, Pisa. CP and charge asymmetries at CDF, article, November 1, 2007; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc897171/m1/1/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.