Evidence for the decay X(3872) -> J/ψω

We present a study of the decays B-0,B-+ -> J/psi pi(+)pi(-)pi K-0(0,+), using 467 x 106 B (B) over bar pairs recorded with the BABAR detector. We present evidence for the decay mode X(3872) -> J/psi omega, with product branching fractions B(B+ -> X(3872K(+)) x B(X(3872) -> J/psi omega) = [0.6 +/- 0.2(stat) +/- 0.1(syst)] x 10(-5), and B(B-0 -> X(3872)K-0) x B(X(3872) -> J/psi omega) = [0.6 +/- 0.3(stat) +/- 0.1(syst)] x 10(-5). A detailed study of the pi(+) pi(-) pi(0) mass distribution from X(3872) decay favors a negative-parity assignment

Search for the rare decay B→Kνν

We present a search for the rare decays B+→K+νν̅ and B0→K0νν̅ using 459×106 BB̅ pairs collected with the BABAR detector at the SLAC National Accelerator Laboratory. Flavor-changing neutral-current decays such as these are forbidden at tree level but can occur through one-loop diagrams in the standard model (SM), with possible contributions from new physics at the same order. The presence of two neutrinos in the final state makes identification of signal events challenging, so reconstruction in the semileptonic decay channels B→D(*)lν of the B meson recoiling from the signal B is used to suppress backgrounds. We set an upper limit at the 90% confidence level (CL) of 1.3×10-5 on the total branching fraction for B+→K+νν̅ , and 5.6×10-5 for B0→K0νν̅ . We additionally report 90% CL upper limits on partial branching fractions in two ranges of dineutrino mass squared for B+→K+νν̅

Search for B+ -> (D+K0) and B+ -> (D+K0) decays

We report a search for the rare decays B+ -> (D+K0) and B+ -> D+K*(0) in an event sample of approximately 465 x 10(6) B (B) over bar pairs collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC National Accelerator Laboratory. We find no significant evidence for either mode and we set 90% probability upper limits on the branching fractions of B(B+ -> (D+K0)) D+K*(0)) < 3.0 x 10(-6

Search for CP violation using T-odd correlations in D-0 -> K+K-pi(+)pi(-) decays

We search for CP violation in a sample of 4.7 x 10(4) Cabibbo suppressed D-0 -> K+K-pi(+)pi(-) decays. We use 470 fb(-1) of data recorded by the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) storage rings running at center-of-mass energies near 10.6 GeV. CP violation is searched for in the difference between the T-odd asymmetries, obtained using triple product correlations, measured for D-0 and (D) over bar (0) decays. The measured CP violation parameter is A(T) = (1.0 +/- 5.1(stat) +/- 4.4(syst)) x 10(-3)

Measurement of the gamma gamma* -> eta c transition form factor

We study the reaction e(+)e(-) -> e(+)e(-) eta(c), eta(c) -> K(S)K(+/-)pi(-/+) and obtain eta(c) mass and width values 2982.2 +/- 0.4 +/- 1.6 MeV/c(2) and 31.7 +/- 1.2 +/- 0.8 MeV, respectively. We find Gamma(eta(c) -> gamma gamma)B(eta(c) -> KK pi) = 0.374 +/- 0.009 +/- 0.031 keV, and measure the gamma gamma* -> eta(c) transition form factor in the momentum transfer range from 2 to 50 GeV(2). The analysis is based on 469 fb(-1) of integrated luminosity collected at PEP-II with the BABAR detector at e(+)e(-) center-of-mass energies near 10.6 GeV

Search for B+ meson decay to a(1)(+)(1260)K*(0)(892)

We present a search for the decay B+ -> a(1)(+)(1260)K*(0)(892). The data, collected with the BABAR detector at the SLAC National Accelerator Laboratory, represent 465 X 10(6)B (B) over bar pairs produced in e(+)e(-) annihilation at the energy of the gamma(4S). We find no significant signal and set an upper limit at 90% confidence level on the product of branching fractions B(B+ -> a(1)(+) (1260)K*(0)(892)) X B(a(1)(+)(1260) -> pi(+) pi(-) pi(+)) of 1.8 X 10(-6)

Search for the rare decay B→Kνν[over ¯]

We present a search for the rare decays B+→K+νν̅ and B0→K0νν̅ using 459×106 BB̅ pairs collected with the BABAR detector at the SLAC National Accelerator Laboratory. Flavor-changing neutral-current decays such as these are forbidden at tree level but can occur through one-loop diagrams in the standard model (SM), with possible contributions from new physics at the same order. The presence of two neutrinos in the final state makes identification of signal events challenging, so reconstruction in the semileptonic decay channels B→D(*)lν of the B meson recoiling from the signal B is used to suppress backgrounds. We set an upper limit at the 90% confidence level (CL) of 1.3×10-5 on the total branching fraction for B+→K+νν̅ , and 5.6×10-5 for B0→K0νν̅ . We additionally report 90% CL upper limits on partial branching fractions in two ranges of dineutrino mass squared for B+→K+νν̅

Томский период деятельности профессора русского права И. А. Малиновского

7 pages, 1 figure, submitted to PRD(RC)International audienceA search for the neutrinoless, lepton-flavor violating decay of the tau lepton into three charged leptons has been performed using an integrated luminosity of 468 fb^-1 collected with the BABAR detector at the PEP-II collider. In all six decay modes considered, the numbers of events found in data are compatible with the background expectations. Upper limits on the branching fractions are set in the range (1.8-3.3) X 10^-8 at 90% confidence level

Study of B -> X gamma decays and determination of vertical bar V-td/V-ts vertical bar

Using a sample of 471 x 10(6) B (B) over bar events collected with the BABAR detector, we study the sum of seven exclusive final states B -> X-s(d)gamma, where X-s(d) is a strange (nonstrange) hadronic system with a mass of up to 2.0 GeV/c(2). After correcting for unobserved decay modes, we obtain a branching fraction for b -> d gamma of (9.2 +/- 2.0(stat) +/- 2.3(syst) x 10(-6) in this mass range, and a branching fraction for b -> s gamma of (23.0 +/- 0.8(stat) +/- 3.0(syst) x 3.0(syst) x 10(-5) in the same mass range. We find B(b -> d gamma)/B(b -> s gamma) = 0.040 +/- 0.009(stat) +/- 0.010(syst), from which we determine vertical bar Vtd/Vts vertical bar = 0.199 +/- 0.022(stat) +/- 0.024(syst) +/- 0.002(th)

Search for b -> u transitions in B- -> DK- and D*K- decays

We report results from an updated study of the suppressed decays B-→DK- and B-→D*K- followed by D→K+π-, where D(*) indicates a D(*)0 or a D̅ (*)0 meson, and D*→Dπ0 or D*→Dγ. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity triangle angle γ due to interference between the b→c transition B-→D(*)0K- followed by the doubly Cabibbo-suppressed decay D0→K+π-, and the b→u transition B-→D̅ (*)0K- followed by the Cabibbo-favored decay D̅ 0→K+π-. We also report an analysis of the decay B-→D(*)π- with the D decaying into the doubly Cabibbo-suppressed mode D→K+π-. Our results are based on 467× 10^6 Υ(4S)→BB̅ decays collected with the BABAR detector at SLAC. We measure the ratios R(*) of the suppressed ([K+π-]DK-/π-) to favored ([K-π+]DK-/π-) branching fractions as well as the CP asymmetries A(*) of those modes. We see indications of signals for the B-→DK- and B-→DDπ0*K- suppressed modes, with statistical significances of 2.1 and 2.2σ, respectively, and we measure: RDK=(1.1±0.6±0.2)×10-2, ADK=-0.86±0.47-0.16+0.12, R(Dπ0)K*=(1.8±0.9± 0.4)×10-2, A(Dπ0)K*=+0.77±0.35±0.12, R(Dγ)K*=(1.3±1.4±0.8)×10-2,A(Dγ)K*=+0.36 ±0.94-0.41+0.25, where the first uncertainty is statistical and the second is systematic. We use a frequentist approach to obtain the magnitude of the ratio rB≡|A(B-→D̅ 0K-)/A(B-→D0K-)|=(9.5-4.1+5.1)%, with rB<16.7% at 90% confidence level. In the case of B-→D*K- we find rB*≡|A(B-→D̅ *0K-)/A(B-→D*0K-)|=(9.6-5.1+3.5)%, with rB*<15.0% at 90% confidence level