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B Aubert,
D Boutigny,
JM Gaillard,
A Hicheur,
Y Karyotakis,
JP Lees,
P Robbe,
V Tisserand,
A Palano,
GP Chen, [......],
Y Pan,
R Prepost,
IJ Scott,
SJ Sekula,
JH von Wimmerspeig-Toeller,
SL Wu,
Z Yu,
H Zobernig,
TMB Kordich,
H Neal
[show abstract]
[hide abstract]
ABSTRACT: We report branching fraction measurements for exclusive decays of charged and neutral B mesons into two-body final states containing a charmonium meson. We use a sample of 22.72±0.36 million BB̅ events collected between October 1999 and October 2000 with the BABAR detector at the PEP-II storage rings at the Stanford Linear Accelerator Center. The charmonium mesons considered here are J/ψ, ψ(2S), and χc1, and the light meson in the decay is either a K, K*, or π0.
Physical Review D 02/2013; 65. · 4.56 Impact Factor
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B Aubert,
D Boutigny,
JM Gaillard,
A Hicheur,
Y Karyotakis,
JP Lees,
P Robbe,
V Tisserand,
A Palano,
GP Chen, [......],
Y Pan,
R Prepost,
IJ Scott,
SJ Sekula,
JH von Wimmersperg-Toeller,
SL Wu,
Z Yu,
H Zobernig,
TMB Kordich,
H Neal
[show abstract]
[hide abstract]
ABSTRACT: The B0 and B+ meson lifetimes have been measured in e+e- annihilation data collected in 1999 and 2000 with the BABAR detector at center-of-mass energies near the ϒ(4S) resonance. Events are selected in which one B meson is fully reconstructed in a hadronic final state while the second B meson is reconstructed inclusively. A combined fit to the B0 and the B+ decay time difference distributions yields τB0 = 1.546±0.032(stat)±0.022(syst) ps, τB+ = 1.673±0.032(stat)±0.023(syst) ps, and τB+/τB0 = 1.082±0.026(stat)±0.012(syst).
Physical Review Letters 02/2013; 87(20). · 7.37 Impact Factor
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BABAR Collaboration,
B Aubert,
D Boutigny,
JM Gaillard,
A Hicheur,
Y Karyotakis,
JP Lees,
P Robbe,
V Tisserand,
A Palano, [......],
R Liu,
Y Pan,
R Prepost,
IJ Scott,
SJ Sekula,
JH von Wimmersperg-Toeller,
SL Wu,
Z Yu,
TMB Kordich,
H Neal
[show abstract]
[hide abstract]
ABSTRACT: New measurements of Ds+ and Ds*+ meson production rates from B decays and from qq̅ continuum events near the Υ(4S) resonance are presented. Using 20.8 fb-1 of data on the Υ(4S) resonance and 2.6 fb-1 off-resonance, we find the inclusive branching fractions B(B⃗Ds+X)=(10.93±0.19±0.58±2.73)% and B(B⃗Ds*+X)=(7.9±0.8±0.7±2.0)%, where the first error is statistical, the second is systematic, and the third is due to the Ds+→φπ+ branching fraction uncertainty. The production cross sections σ(e+e-→Ds+X)×B(Ds+→φπ+)=7.55±0.20±0.34pb and σ(e+e-→Ds*±X)×B(Ds+→φπ+)=5.8±0.7±0.5pb are measured at center-of-mass energies about 40 MeV below the Υ(4S) mass. The branching fractions ΣB(B⃗Ds(*)+D(*))=(5.07±0.14±0.30±1.27)% and ΣB(B⃗Ds*+D(*))=(4.1±0.2±0.4±1.0)% are determined from the Ds(*)+ momentum spectra. The mass difference m(Ds+)-m(D+)=98.4±0.1±0.3MeV/c2 is also measured.
Physical Review D 02/2013; 65(9). · 4.56 Impact Factor
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A. V. Anisovich,
C A Baker,
C J Batty,
D V Bugg,
R P Haddock,
C Hodd,
V. A. Nikonov,
A. V. Sarantsev,
V. V. Sarantsev, I Scott,
B. S. Zou
[show abstract]
[hide abstract]
ABSTRACT: We present data on pbar-p -> eta-eta-pizero at beam momenta of 600, 900,
1050, and 1200 MeV/c. At the higher three momenta, a signal is clearly visible
due to pbar-p -> f_0(1770)-pizero, f_0(1770) -> eta-eta. It has mass 1770+-12
MeV and width 220+-40 MeV, where errors cover systematic uncertainties as well
as statistics.
09/2011;
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C A Baker,
B M Barnett,
C J Batty,
K Braune,
D V Bugg,
O Cramer,
V Crede,
N. Djaoshvili,
W Dunnweber,
M A Faessler, [......],
W Roethel,
A. Sarantsev, I Scott,
C Strassburger,
U Thoma,
C. Volker,
S Wallis,
D Walther,
K Wittmack,
B. S. Zou
[show abstract]
[hide abstract]
ABSTRACT: Data are presented on the reaction pbar-p -> omega-omega-pizero at rest from
the Crystal Barrel detector. These data identify a strong signal due to
f2(1565) -> omega-omega. The relative production from initial pbar-p states
3P2, 3P1 and 1S0 is well determined from omega-omega decay angular
correlations; P-state annihilation dominates strongly. A combined fit is made
with data on pbar-p -> 3pizero at rest, where f2(1565) -> pizero-pizero is
observed.
09/2011;
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A. V. Anisovich,
C A Baker,
C J Batty,
D V Bugg,
C Hodd,
J Kisiel,
V. A. Nikonov,
A. V. Sarantsev,
V. V. Sarantsev, I Scott,
B. S. Zou
[show abstract]
[hide abstract]
ABSTRACT: Data on pbar-b annihilation in flight into pizero-pizero-eta are presented
for nine beam momenta 600 to 1940 MeV/c. The strongest four intermediate states
are found to be f_2(1270)-eta, a_2(1320)-pi, sigma-eta and a_0(980)-pi. Partial
wave analysis is performed mainly to look for resonances formed by pbar-p and
decaying into pizero-pizero-eta through these intermediate states. There is
evidence for the following s-channel I = 0 resonances : two 4^{++} resonances
with mass and width (M,Gamma) at (2044, 208) MeV and (2320+-30, 220+-30) MeV;
three 2^{++} resonances at (2020+-50, 200+-70) MeV, (2240+-40, 170+-50) MeV and
(2370+-50, 320+-50) MeV; two 3^{++} resonances at (2000+-40, 250+-40) MeV and
(2280+-30, 210+-30) MeV; a 1^{++} resonance at (2340+-40, 340+-40) MeV; and two
2^{-+} resonances at (2040+-40, 190+-40) MeV and (2300+-40, 270+-40) MeV.
09/2011;
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B Aubert,
D Boutigny,
JM Gaillard,
A Hicheur,
Y Karyotakis,
JP Lees,
P Robbe,
V Tisserand,
A Palano,
GP Chen, [......],
R Prepost,
IJ Scott,
SJ Sekula,
JH von Wimmersperg-Toeller,
SL Wu,
Z Yu,
H Zobernig,
TMB Kordich,
H Neal,
BABAR Collaboration
[show abstract]
[hide abstract]
ABSTRACT: We report the result of a search for the rare decay B0→γγ in 426 fb-1 of data, corresponding to 226×106 B0B̅ 0 pairs, collected on the Υ(4S) resonance at the PEP-II asymmetric-energy e+e- collider using the BABAR detector. We use a maximum likelihood fit to extract the signal yield and observe 21-12+13 signal events with a statistical significance of 1.8σ. This corresponds to a branching fraction B(B0→γγ)=(1.7±1.1(stat.)±0.2(syst.))×10-7. Based on this result, we set a 90% confidence level upper limit of B(B0→γγ)<3.2×10-7.
Physical Review D. 01/2011; 83:11.
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[show abstract]
[hide abstract]
ABSTRACT: It is widely assumed that there is a positive relationship between egg quality (or egg size) and offspring fitness. However, obtaining unequivocal data in support of this hypothesis has been hampered by the lack of any method for non-destructive determination of egg composition, preventing a direct analysis of egg quality and subsequent chick growth and survival in the same egg(s). In this paper, we describe the application of a rapid, non-destructive technique using measurement of total body electrical conductivity (TOBEC) for determination of egg composition in intact eggs. The TOBEC index was positively and highly correlated with egg lean mass and with the mass of some egg components (albumen and water content). Values for predicted lean mass, based on the regression equation for lean mass against TOBEC index, were within ±6% of actual lean mass. Egg lipid mass was most accurately predicted (±15%) using a multiple regression model, with fresh egg mass and TOBEC index included as independent variables. Egg temperature, and the position of the egg in the sampling chamber, markedly affected the TOBEC index obtained.
Journal of Zoology 03/2009; 243(3):611 - 622. · 2.04 Impact Factor
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V. Re,
C. Borean,
C. Bozzi,
V. Carassiti,
A.C. Ramusino,
L. Piemontese,
A.B. Breon,
D. Brown,
A.R. Clark,
F. Goozen, [......],
W. Walkoviak,
M. Wilder,
M. Wilson,
E. Charles,
P. Elmer,
J. Nielsen,
W. Orejudos, I. Scott,
H. Zobernig,
S. Laplace
[show abstract]
[hide abstract]
ABSTRACT: The silicon-vertex tracker (SVT) for the BaBar Experiment at the PEP-H Asymmetric B Factory at Stanford Linear Accelerator Center (SLAC), is a five-layer double-sided ac-coupled silicon-microstrip detector. It is a crucial element for the precise measurement of the decay position of B mesons, satisfying the severe constraints imposed by the accelerator design, in terms of geometry of the interaction region and conditions of operation. In the following paper, the SVT performance is described. Radiation issues are discussed and the results of different tests aimed to study the decrease in the SVT performance due to radiation damage are presented. The alignment procedure is described, and a few BaBar physics results are presented as examples of the SVT capabilities to reconstruct decay vertices with good resolution and efficiency.
IEEE Transactions on Nuclear Science 01/2003; · 1.45 Impact Factor
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B Aubert,
D Boutigny,
J-M Gaillard,
A Hicheur,
Y Karyotakis,
J P Lees,
P Robbe,
V Tisserand,
A Palano,
G P Chen, [......],
Y Pan,
R Prepost,
I J Scott,
S J Sekula,
J H von Wimmersperg-Toeller,
S L Wu,
Z Yu,
H Zobernig,
T M B Kordich,
H Neal
[show abstract]
[hide abstract]
ABSTRACT: The branching fractions of the exclusive decays B0-->K(*0)gamma and B+-->K(*+)gamma are measured from a sample of (22.74+/-0.36)x10(6) BB decays collected with the BABAR detector at the PEP-II asymmetric e(+)e(-) collider. We find B (B0-->K(*0)gamma) = [4.23+/-0.40(stat)+/-0.22(syst)]x10(-5), B(B+-->K(*+)gamma) = [3.83+/-0.62(stat)+/-0.22(syst)]x10(-5) and constrain the CP-violating charge asymmetry to be -0.170<A(CP)(B-->K(*)gamma)<0.082 at 90% C.L.
Physical Review Letters 03/2002; 88(10):101805. · 7.37 Impact Factor
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Internal Medicine Journal 12/2001; 31(9):536 - 540. · 1.54 Impact Factor
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V Re,
C Borean,
C Bozzi,
V. Carassiti,
A Cotta-Ramusino,
L Piemontese,
A B Breon,
D Brown,
A.R. Clark,
F. Goozen, [......],
W. Walkoviak,
M. Wilder,
M Wilson,
E Charles,
P Elmer,
J Nielsen,
W Orejudos, I Scott,
H Zobernig,
S Laplace
[show abstract]
[hide abstract]
ABSTRACT: The Silicon Vertex Tracker (SVT) of the BABAR experiment at the PEP-II asymmetric B factory is a five layers double sided, AC coupled silicon microstrip detector. It represents a crucial element to measure with precision the decay position of B mesons, satisfying the severe constraints imposed by the accelerator design, in terms of geometry of the interaction region and conditions of operation. In the following paper the SVT performances are described. Radiation issues are discussed and the results of different tests aimed to study the SVT degeneration in performance due to the radiation damage are presented. The alignment procedure is described and a few BaBar physics results are presented as examples of the SVT capabilities to reconstruct decay vertices with good resolution and efficiency.
Nuclear Science Symposium Conference Record, 2001 IEEE; 12/2001
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B Aubert,
D Boutigny,
J M Gaillard,
A Hicheur,
Y Karyotakis,
J P Lees,
P Robbe,
V Tisserand,
A Palano,
G P Chen, [......],
Y Pan,
R Prepost,
I J Scott,
S J Sekula,
J H von Wimmersperg-Toeller,
S L Wu,
Z Yu,
H Zobernig,
T M Kordich,
H Neal
[show abstract]
[hide abstract]
ABSTRACT: The B(0) and B(+) meson lifetimes have been measured in e(+)e(-) annihilation data collected in 1999 and 2000 with the BABAR detector at center-of-mass energies near the Upsilon(4S) resonance. Events are selected in which one B meson is fully reconstructed in a hadronic final state while the second B meson is reconstructed inclusively. A combined fit to the B(0) and the B(+) decay time difference distributions yields tau(B(0)) = 1.546+/-0.032(stat)+/-0.022(syst) ps, tau(B(+)) = 1.673+/-0.032(stat)+/-0.023(syst) ps, and tau(B(+))/tau(B(0)) = 1.082+/-0.026(stat)+/-0.012(syst).
Physical Review Letters 12/2001; 87(20):201803. · 7.37 Impact Factor
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B Aubert,
D Boutigny,
J M Gaillard,
A Hicheur,
Y Karyotakis,
J P Lees,
P Robbe,
V Tisserand,
A Palano,
G P Chen, [......],
Y Pan,
R Prepost,
I J Scott,
S J Sekula,
J H von Wimmersperg-Toeller,
S L Wu,
Z Yu,
H Zobernig,
T M Kordich,
H Neal
[show abstract]
[hide abstract]
ABSTRACT: We present a measurement of the decay amplitudes in B-->J/psiK*(892) channels using 20.7 fb(-1) of data collected at the Upsilon(4S) resonance with the BABAR detector at PEP-II. We measure a P-wave fraction R(perpendicular) = (16.0 +/- 3.2 +/- 1.4)% and a longitudinal polarization fraction (59.7 +/- 2.8 +/- 2.4)%. The measurement of a relative phase that is neither 0 nor pi, phi = 2.50 +/- 0.20 +/-0.08 radians, favors a departure from the factorization hypothesis. Although the decay B-->/psiK(pi) proceeds mainly via K*(892), there is also evidence for K2*(1430) and K(pi) S-wave contributions.
Physical Review Letters 12/2001; 87(24):241801. · 7.37 Impact Factor
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B Aubert,
D Boutigny,
J M Gaillard,
A Hicheur,
Y Karyotakis,
J P Lees,
P Robbe,
V Tisserand,
A Palano,
G P Chen, [......],
Y Pan,
R Prepost,
I J Scott,
S J Sekula,
J H von Wimmersperg-Toeller,
S L Wu,
Z Yu,
H Zobernig,
T M Kordich,
H Neal
[show abstract]
[hide abstract]
ABSTRACT: We present a limit on the branching fraction for the decay B0-->gammagamma using data collected at the Upsilon(4S) resonance with the BABAR detector at the PEP-II asymmetric energy e+e- collider. Based on the observation of one event in the signal region, out of a sample of 21.3x10(6) e+e--->Upsilon(4S)-->BB decays, we establish an upper limit on the branching fraction of B(B0-->gammagamma)<1.7x10(-6) at the 90% confidence level. This result substantially improves upon existing limits.
Physical Review Letters 12/2001; 87(24):241803. · 7.37 Impact Factor
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B Aubert,
D Boutigny,
J M Gaillard,
A Hicheur,
Y Karyotakis,
J P Lees,
P Robbe,
V Tisserand,
A Palano,
G P Chen, [......],
Y Pan,
R Prepost,
I J Scott,
S J Sekula,
J H von Wimmersperg-Toeller,
S L Wu,
Z Yu,
H Zobernig,
T M Kordich,
H Neal
[show abstract]
[hide abstract]
ABSTRACT: We present the results of searches for B decays to charmless two-body final states containing eta(') or omega mesons, based on 20.7 fb(-1) of data collected with the BABAR detector. We find the branching fractions Beta(B(+)-->eta(')K(+)) = (70+/-8+/-5) x 10(-6), Beta(B(0)-->eta(')K(0)) = (42(+13)(-11) +/- 4) x 10(-6), and Beta(B(+)-->omega pi(+)) = (6.6(+2.1)(-1.8) +/- 0.7) x 10(-6), where the first error quoted is statistical and the second is systematic. We give measurements of four additional modes for which the 90% confidence level upper limits are Beta(B(+)-->eta(')pi(+)) < 12 x 10(-6), Beta(B(+)-->omega K(+)) < 4 x 10(-6), Beta(B(0)-->omega K(0)) < 13 x 10(-6), and Beta(B(0)-->omega pi(0)) < 3 x 10(-6).
Physical Review Letters 11/2001; 87(22):221802. · 7.37 Impact Factor
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B Aubert,
D Boutigny,
J M Gaillard,
A Hicheur,
Y Karyotakis,
J P Lees,
P Robbe,
V Tisserand,
A Palano,
G P Chen, [......],
Y Pan,
R Prepost,
I J Scott,
S J Sekula,
J H von Wimmersperg-Toeller,
S L Wu,
Z Yu,
H Zobering,
T M Kordich,
H Neal
[show abstract]
[hide abstract]
ABSTRACT: We present measurements, based on a sample of approximately 23x10(6) BB pairs, of the branching fractions and a search for CP-violating charge asymmetries in charmless hadronic decays of B mesons into two-body final states of kaons and pions. We find the branching fractions B(B0-->pi(+)pi(-)) = (4.1+/-1.0+/-0.7)x10(-6), B(B0-->K+pi(-)) = (16.7+/-1.6+/-1.3)x10(-6), B(B+-->K+pi(0)) = (10.8(+2.1)(-1.9)+/-1.0)x10(-6), B(B+-->K0pi(+)) = (18.2(+3.3)(-3.0)+/-2.0)x10(-6), B(B0-->K0pi(0)) = (8.2(+3.1)(-2.7)+/-1.2)x10(-6). We also report 90% confidence level upper limits for B meson decays to the pi(+)pi(0), K+K-, and K0K+ final states. In addition, charge asymmetries have been found to be consistent with zero, where the statistical precision is in the range of +/-0.10 to +/-0.18, depending on the decay mode.
Physical Review Letters 10/2001; 87(15):151802. · 7.37 Impact Factor
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B Aubert,
D Boutigny,
J M Gaillard,
A Hicheur,
Y Karyotakis,
J P Lees,
P Robbe,
V Tisserand,
A Palano,
G P Chen, [......],
Y Pan,
R Prepost,
I J Scott,
S J Sekula,
J H von Wimmersperg-Toeller,
S L Wu,
Z Yu,
H Zobering,
T M Kordich,
H Neal
[show abstract]
[hide abstract]
ABSTRACT: We have observed the decays B--> phiK and phiK(*) in a sample of over 45 million B mesons collected with the BABAR detector at the PEP-II collider. The measured branching fractions are B(B+--> phiK+) = (7.7(+1.6)(-1.4)+/-0.8)x10(-6), B(B0--> phiK0) = (8.1(+3.1)(-2.5)+/-0.8)x10(-6), B(B+--> phiK(*+)) = (9.7(+4.2)(-3.4)+/-1.7)x10(-6), and B(B0--> phiK(*0)) = (8.7(+2.5)(-2.1)+/-1.1)x10(-6). We also report the upper limit B(B+--> phipi(+))<1.4x10(-6) ( 90% C.L.).
Physical Review Letters 10/2001; 87(15):151801. · 7.37 Impact Factor
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B Aubert,
D Boutigny,
J M Gaillard,
A Hicheur,
Y Karyotakis,
J P Lees,
P Robbe,
V Tisserand,
A Palano,
G P Chen, [......],
Y Pan,
R Prepost,
I J Scott,
S J Sekula,
J H von Wimmersperg-Toeller,
S L Wu,
Z Yu,
H Zobernig,
T M Kordich,
H Neal
[show abstract]
[hide abstract]
ABSTRACT: The production of J/psi mesons in continuum e(+)e(-) annihilations has been studied with the BABAR detector at energies near the Upsilon(4S) resonance. The mesons are distinguished from J/psi production in B decays through their center-of-mass momentum and energy. We measure the cross section e(+)e(-)-->J/psi X to be 2.52+/-0.21+/-0.21 pb. We set a 90% C.L. upper limit on the branching fraction for direct Upsilon(4S)-->J/psi X decays at 4.7 x 10(-4).
Physical Review Letters 10/2001; 87(16):162002. · 7.37 Impact Factor
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B Aubert,
D Boutigny,
J M Gaillard,
A Hicheur,
Y Karyotakis,
J P Lees,
P Robbe,
V Tisserand,
A Palano,
G P Chen, [......],
J Nielsen,
Y Pan,
R Prepost,
I J Scott,
S J Sekula,
J H von Wimmersperg-Toeller,
S L Wu,
H Zobernig,
T M Kordich,
H Neal
[show abstract]
[hide abstract]
ABSTRACT: We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. This result uses an additional sample of Upsilon(4S) decays collected in 2001, bringing the data available to 32 x 10(6) BB macro pairs. We select events in which one neutral B meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2 beta, is derived from the decay time distributions in such events. The result sin2 beta = 0.59+/-0.14(stat)+/-0.05(syst) establishes CP violation in the B(0) meson system. We also determine absolute value of lambda = 0.93+/-0.09(stat)+/-0.03(syst), consistent with no direct CP violation.
Physical Review Letters 09/2001; 87(9):091801. · 7.37 Impact Factor
