Papers by Giuseppe Finocchiaro
Physical Review D, 2008
We present measurements of the decays B + → X(3872)K + and B 0 → X(3872)K 0 with X(3872) → J/ψ π ... more We present measurements of the decays B + → X(3872)K + and B 0 → X(3872)K 0 with X(3872) → J/ψ π + π -. The data sample used, collected with the BABAR detector at the PEP-II e + e -asymmetric-energy storage ring, corresponds to 455 × 10 6 B B pairs. Branching fraction measurements of B(B + → X(3872)K + ) × B(X(3872) → J/ψ π + π -) = (8.4 ± 1.5 ± 0.7) × 10 -6 and B(B 0 → X(3872)K 0 ) × B(X(3872) → J/ψ π + π -) = (3.5 ± 1.9 ± 0.4) × 10 -6 are obtained. We set an upper limit on the natural width of the X(3872) of Γ < 3.3 MeV/c 2 at the 90% confidence level.
Physical Review D, 2008
We present a search for the decay B + → τ + ν using 383 × 10 6 BB pairs collected at the Υ (4S) r... more We present a search for the decay B + → τ + ν using 383 × 10 6 BB pairs collected at the Υ (4S) resonance with the BABAR detector at the SLAC PEP-II B Factory. We select a sample of events with one completely reconstructed tag B in a hadronic decay mode (B -→ D ( * )0 X -), and examine the rest of the event to search for a B + → τ + ν decay. We identify the τ lepton in the following modes: τ + → e + νν, τ + → µ + νν, τ + → π + ν and τ + → π + π 0 ν. We find a 2.2 σ excess in data and measure a branching fraction of B(B + → τ + ν) = (1.8 +0.9 -0.8 (stat.) ± 0.4(bkg. syst.) ± 0.2(other syst.)) × 10 -4 . We calculate the product of the B meson decay constant fB and |V ub | to be fB • |V ub | = (10.1 +2.3 -2.5 (stat.) +1.2 -1.5 (syst.
Physical Review Letters, 2010
We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element jV cb j and the formfact... more We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element jV cb j and the formfactor slope & 2 in " B ! D' À " # ' decays based on 460 Â 10 6 B " B events recorded at the Çð4SÞ resonance with the BABAR detector. " B ! D' À " # ' decays are selected in events in which a hadronic decay of the second B meson is fully reconstructed. We measure BðB À ! D 0 ' À " # ' Þ=BðB À ! X' À " # ' Þ ¼ ð0:255 AE 0:009 AE 0:009Þ and Bð " :230 AE 0:011 AE 0:011Þ, along with the differential decay distribution in " B ! D' À " # ' decays. We then determine Gð1ÞjV cb j ¼ ð42:3 AE 1:9 AE 1:4Þ Â 10 À3 and & 2 ¼ 1:20 AE 0:09 AE 0:04, where Gð1Þ is the hadronic form factor at the point of zero recoil.
Physical Review Letters, 2010
We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle through a Dalitz pl... more We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle through a Dalitz plot analysis of neutral D-meson decays to K S Ç , using 468 million B " B pairs collected by the BABAR detector at the PEP-II asymmetric-energy e þ e À collider at SLAC. We measure ¼ ð68 AE 14 AE 4 AE 3Þ (modulo 180 ), where the first error is statistical, the second is the experimental systematic uncertainty, and the third reflects the uncertainty in the description of the neutral D decay amplitudes. This result is inconsistent with ¼ 0 (no direct CP violation) with a significance of 3.5 standard deviations.
Physical Review Letters, 2008
Physical Review Letters, 2006
Physical Review Letters, 2008
We report measurements of branching fractions for the decays B → P ℓν ℓ , where P are the pseudos... more We report measurements of branching fractions for the decays B → P ℓν ℓ , where P are the pseudoscalar charmless mesons π -, π 0 , η and η ′ , based on 348 fb -1 of data collected with the BABAR detector, using B 0 and B + mesons found in the recoil of a second B meson decaying as B → D ( * ) ℓν ℓ . Assuming isospin symmetry, we combine pionic branching fractions to obtain B(B 0 → π -ℓ + ν ℓ ) = (1.54 ± 0.17 (stat) ± 0.09 (syst) ) × 10 -4 ; we find 3.2σ evidence of the decay B + → ηℓ + ν ℓ and measure its branching fraction to be (0.64 ± 0.20 (stat) ± 0.03 (syst) ) × 10 -4 , and determine B(B + → η ′ ℓ + ν ℓ ) < 0.47×10 -4 to 90% confidence level. Using partial branching fractions for the pionic decays in ranges of the momentum transfer and a recent form factor calculation, we obtain the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |V ub | = (4.0±0.5 (stat) ±0.2 (syst) +0.7 -0.5(theory) )×10 -3 .
Physical Review Letters, 2005
We present evidence for the b ! d penguin-dominated decays B ! K 0 K and B 0 ! K 0 K 0 in 227 10 ... more We present evidence for the b ! d penguin-dominated decays B ! K 0 K and B 0 ! K 0 K 0 in 227 10 6 4S ! B B decays collected with the BABAR detector. We measure the branching fractions BB ! K 0 K 1:5 0:5 0:1 10 ÿ6 <2:4 10 ÿ6 and BB 0 ! K 0 K 0 1:19 0:40 ÿ0:35 0:13 10 ÿ6 , where the uncertainties are statistical and systematic, respectively. We also present improved measurements of the charge-averaged branching fraction BB ! K 0 26:0 1:3 1:0 10 ÿ6 and CP-violating charge asymmetry A CP K 0 ÿ0:09 0:05 0:01, where the uncertainties are statistical and systematic, respectively.
Physical Review Letters, 2005
We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates... more We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 227 10 6 4S ! BB decays collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The amplitude of the CPasymmetry, sin2 in the standard model, is derived from decay-time distributions from events in which one neutral B meson
Physical Review Letters, 2007
Measurement of cos 2β in B 0 → D ( * )0 h 0 decays with a time-dependent Dalitz plot analysis of ... more Measurement of cos 2β in B 0 → D ( * )0 h 0 decays with a time-dependent Dalitz plot analysis of D 0 → K 0 S π + π -
Physical Review D, 2010
We report a search for the rare decays B + → D + K 0 and B + → D + K * 0 in an event sample of ap... more We report a search for the rare decays B + → D + K 0 and B + → D + K * 0 in an event sample of approximately 465 million BB pairs collected with the BABAR detector at the PEP-II asymmetricenergy e + e -collider at SLAC. We find no significant evidence for either mode and we set 90% probability upper limits on the branching fractions of B(B + → D + K 0 ) < 2.9 × 10 -6 and B(B + → D + K * 0 ) < 3.0 × 10 -6 .
Physical Review D, 2008
We present a measurement of the branching fractions for the Cabibbo-favored radiative decay, D 0 ... more We present a measurement of the branching fractions for the Cabibbo-favored radiative decay, D 0 → K * 0 γ, and the Cabibbo-suppressed radiative decay, D 0 → φγ. These measurements are based on a data sample corresponding to an integrated luminosity of 387.1 fb -1 , recorded with
Physical Review D, 2010
A search for the Zð3930Þ resonance in production of the D " D system has been performed using a d... more A search for the Zð3930Þ resonance in production of the D " D system has been performed using a data sample corresponding to an integrated luminosity of 384 fb À1 recorded by the BABAR experiment at the PEP-II asymmetric-energy electron-positron collider. The D " D invariant mass distribution shows clear evidence of the Zð3930Þ state with a significance of 5:8. We determine mass and width values of ð3926:7 AE 2:7 AE 1:1Þ MeV=c 2 and ð21:3 AE 6:8 AE 3:6Þ MeV, respectively. A decay angular analysis provides evidence that the Zð3930Þ is a tensor state with positive parity and C parity (J PC ¼ 2 þþ ); therefore we identify the Zð3930Þ state as the c2 ð2PÞ meson. The value of the partial width À Â BðZð3930Þ ! D " DÞ is found to be ð0:24 AE 0:05 AE 0:04Þ keV.
Physical Review D, 2009
A Dalitz plot analysis of approximately 13, 000 D + s decays to π + π -π + has been performed. Th... more A Dalitz plot analysis of approximately 13, 000 D + s decays to π + π -π + has been performed. The analysis uses a 384 fb -1 data sample recorded by the BABAR detector at the PEP-II asymmetricenergy e + e -storage ring running at center of mass energies near 10.6 GeV. Amplitudes and phases of the intermediate resonances which contribute to this final state are measured. A high precision measurement of the ratio of branching fractions is performed: 009. Using a model-independent partial wave analysis, the amplitude and phase of the S-wave have been measured.
Physical Review D, 2008
We report measurements of B-meson decays into two-and three-body final states containing two char... more We report measurements of B-meson decays into two-and three-body final states containing two charmed baryons using a sample of 230 10 6 4S ! B B decays. We find significant signals in two modes, measuring branching fractions BB ÿ ! c ÿ c K ÿ 1:14 0:15 0:17 0:60 10 ÿ3 and
Physical Review D, 2006
We present measurements of CP-violating asymmetries and branching fractions for the decays B ! ! ... more We present measurements of CP-violating asymmetries and branching fractions for the decays B ! ! , B ! !K , and B 0 ! !K 0 . The data sample corresponds to 232 10 6 B B pairs produced by e e ÿ annihilation at the 4S resonance. For the decay B 0 ! !K 0 S , we measure the time-dependent
Physical Review D, 2007
A study of exclusive production of the D D system through initial-state radiation is performed in... more A study of exclusive production of the D D system through initial-state radiation is performed in a search for charmonium states, where D = D 0 or D + . The D 0 mesons are reconstructed in the D 0 → K -π + , D 0 → K -π + π 0 , and D 0 → K -π + π + π -decay modes. The D + is reconstructed through the D + → K -π + π + decay mode. The analysis makes use of an integrated luminosity of 288.5 fb -1 collected by the BABAR experiment. The D D mass spectrum shows a clear ψ(3770) signal. Further structures appear in the 3.9 and 4.1 GeV/c 2 regions. No evidence is found for Y (4260) decays to D D, implying an upper limit B(Y (4260)→D D) B(Y (4260)→J/ψπ + π -) < 7.6 (95% confidence level).
Physical Review D, 2008
We present an investigation of the decays B 0 → Λ + c p and B -→ Λ + c pπ -based on 383 × 10 6 Υ ... more We present an investigation of the decays B 0 → Λ + c p and B -→ Λ + c pπ -based on 383 × 10 6 Υ (4S) → BB decays recorded with the BABAR detector. We measure the branching fractions of these decays; their ratio is pπ - process exhibits an enhancement at the Λ + c p threshold and is a laboratory for searches for excited charm baryon states. We observe the resonant decays B -→ Σc(2455) 0 p and B -→ Σc(2800) 0 p but see no evidence for B -→ Σc(2520) 0 p. This is the first observation of the decay B -→ Σc(2800) 0 p; however, the mass of the observed excited Σ 0 c state is (2846 ± 8 ± 10) MeV/c 2 , which is somewhat inconsistent with previous measurements. Finally, we examine the angular distribution of the B -→ Σc(2455) 0 p decays and measure the spin of the Σc(2455) 0 baryon to be 1/2, as predicted by the quark model.
Uploads
Papers by Giuseppe Finocchiaro