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2005•Unpublished venueOpen access

Improved Measurements of CP-Violating AsymmetryAmplitudes in B0 to pi+pi- Decays

B. Aubert

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Abstract

The authors present updated measurements of the CP-violating parameters S{sub {pi}{pi}} and C{sub {pi}{pi}} in B{sup 0} {yields} {pi}{sup +}{pi}{sup -} decays. Using a sample of 227 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC, they observe 467 {+-} 33 signal decays and measure S{sub {pi}{pi}} = -0.30 {+-} 0.17(stat) {+-} 0.03(syst), and C{sub {pi}{pi}} = -0.09 {+-} 0.15(stat) {+-} 0.04(syst).

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What this paper is about

The authors present updated measurements of the CP-violating parameters S{sub {pi}{pi}} and C{sub {pi}{pi}} in B{sup 0} {yields} {pi}{sup +}{pi}{sup -} decays. Using a sample of 227 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC, they observe 467 {+-} 33 signal decays and measure S{sub {pi}{pi}} = -0.30 {+-} 0.17(stat) {+-} 0.03(syst), and C{sub {pi}{pi}} = -0.09 {+-} 0.15(stat) {+-} 0.04(syst).

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Available abstract

The authors present updated measurements of the CP-violating parameters S{sub {pi}{pi}} and C{sub {pi}{pi}} in B{sup 0} {yields} {pi}{sup +}{pi}{sup -} decays. Using a sample of 227 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC, they observe 467 {+-} 33 signal decays and measure S{sub {pi}{pi}} = -0.30 {+-} 0.17(stat) {+-} 0.03(syst), and C{sub {pi}{pi}} = -0.09 {+-} 0.15(stat) {+-} 0.04(syst).

Key concepts: Pi, Physics, Collider, Particle physics, Bar (unit), Nuclear physics, CP violation, Chemistry

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