Measurement of the Branching Fraction, Polarization, and CP Asymmetries in $B^0 \to \rho^0 \rho^0$ Decay, and Implications for the CKM Angle $\alpha$

The BaBar Collaboration

doi:10.1103/PhysRevD.78.071104

Measurement of the Branching Fraction, Polarization, and CP Asymmetries in $B^0 \to \rho^0 \rho^0$ Decay, and Implications for the CKM Angle $\alpha$

The BaBar Collaboration

Research output: Contribution to journal › Article › peer-review

Abstract

We study B0->rho0rho0 decays in a sample of 465*10^6 Upsilon (4S)->BBbar events collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction B = (0.92 +/- 0.32 +/- 0.14)*10^{-6} and longitudinal polarization fraction f_L = 0.75^{+0.11}_{-0.14} +/- 0.04, where the first uncertainty is statistical and the second is systematic. The evidence for the B0->rho0rho0 signal has a significance of 3.1 standard deviations, including systematic uncertainties. We investigate the proper-time dependence of the longitudinal component in the decay and measure the CP-violating coefficients S^{00}_L = (0.3 +/- 0.7 +/- 0.2) and C^{00}_L = (0.2 +/- 0.8 +/- 0.3). We study the implication of these results for the unitarity triangle angle alpha.

Original language	English
Number of pages	7
Journal	Phys. Rev.
Volume	D78
DOIs	https://doi.org/10.1103/PhysRevD.78.071104
Publication status	Published - Jul 2008

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@article{16d56b0d24c7418392daf646c1cc05ea,

title = "Measurement of the Branching Fraction, Polarization, and CP Asymmetries in $B^0 \to \rho^0 \rho^0$ Decay, and Implications for the CKM Angle $\alpha$",

abstract = "We study B0->rho0rho0 decays in a sample of 465*10^6 Upsilon (4S)->BBbar events collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction B = (0.92 +/- 0.32 +/- 0.14)*10^{-6} and longitudinal polarization fraction f_L = 0.75^{+0.11}_{-0.14} +/- 0.04, where the first uncertainty is statistical and the second is systematic. The evidence for the B0->rho0rho0 signal has a significance of 3.1 standard deviations, including systematic uncertainties. We investigate the proper-time dependence of the longitudinal component in the decay and measure the CP-violating coefficients S^{00}_L = (0.3 +/- 0.7 +/- 0.2) and C^{00}_L = (0.2 +/- 0.8 +/- 0.3). We study the implication of these results for the unitarity triangle angle alpha.",

author = "George Lafferty and Kim Alwyn and David Bailey and Chia, {Y. M.} and Roger Barlow and Christina Edgar and Graham Jackson and Timothy West and Jong Yi and {The BaBar Collaboration}",

year = "2008",

month = jul,

doi = "10.1103/PhysRevD.78.071104",

language = "English",

volume = "D78",

journal = "Phys. Rev.",

issn = "1550-2368",

publisher = "American Physical Society",

}

TY - JOUR

T1 - Measurement of the Branching Fraction, Polarization, and CP Asymmetries in $B^0 \to \rho^0 \rho^0$ Decay, and Implications for the CKM Angle $\alpha$

AU - Lafferty, George

AU - Alwyn, Kim

AU - Bailey, David

AU - Chia, Y. M.

AU - Barlow, Roger

AU - Edgar, Christina

AU - Jackson, Graham

AU - West, Timothy

AU - Yi, Jong

AU - The BaBar Collaboration

PY - 2008/7

Y1 - 2008/7

N2 - We study B0->rho0rho0 decays in a sample of 465*10^6 Upsilon (4S)->BBbar events collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction B = (0.92 +/- 0.32 +/- 0.14)*10^{-6} and longitudinal polarization fraction f_L = 0.75^{+0.11}_{-0.14} +/- 0.04, where the first uncertainty is statistical and the second is systematic. The evidence for the B0->rho0rho0 signal has a significance of 3.1 standard deviations, including systematic uncertainties. We investigate the proper-time dependence of the longitudinal component in the decay and measure the CP-violating coefficients S^{00}_L = (0.3 +/- 0.7 +/- 0.2) and C^{00}_L = (0.2 +/- 0.8 +/- 0.3). We study the implication of these results for the unitarity triangle angle alpha.

AB - We study B0->rho0rho0 decays in a sample of 465*10^6 Upsilon (4S)->BBbar events collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction B = (0.92 +/- 0.32 +/- 0.14)*10^{-6} and longitudinal polarization fraction f_L = 0.75^{+0.11}_{-0.14} +/- 0.04, where the first uncertainty is statistical and the second is systematic. The evidence for the B0->rho0rho0 signal has a significance of 3.1 standard deviations, including systematic uncertainties. We investigate the proper-time dependence of the longitudinal component in the decay and measure the CP-violating coefficients S^{00}_L = (0.3 +/- 0.7 +/- 0.2) and C^{00}_L = (0.2 +/- 0.8 +/- 0.3). We study the implication of these results for the unitarity triangle angle alpha.

U2 - 10.1103/PhysRevD.78.071104

DO - 10.1103/PhysRevD.78.071104

M3 - Article

SN - 1550-2368

SN - 2470-0029

VL - D78

JO - Phys. Rev.

JF - Phys. Rev.

ER -

Measurement of the Branching Fraction, Polarization, and CP Asymmetries in $B^0 \to \rho^0 \rho^0$ Decay, and Implications for the CKM Angle $\alpha$

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