Updated measurement of the CKM angle $\alpha$ using $B^0 \to \rho^ + \rho^ - $ decays

The BaBar Collaboration

Updated measurement of the CKM angle $\alpha$ using $B^0 \to \rho^ + \rho^ - $ decays

The BaBar Collaboration

Research output: Chapter in Book/Conference proceeding › Conference contribution

Abstract

We present results from an analysis of B0->rho+rho- using 316fb^-1 of Y(4S) -> B0B0bar decays observed with the BaBar detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure the B0->rho+rho- branching fraction, longitudinal polarization fraction fL, and the CP-violating parameters S_LONG and C_LONG: B(B0->rho+rho-) = (23.5 +/- 2.2 [stat] +/- 4.1 [syst]) * 10^-6, fL = 0.977 +/- 0.024 [stat] +0.015/-0.013 [syst] S_LONG = -0.19 +/- 0.21 [stat] +0.05/-0.07 [syst] C_LONG = -0.07 +/- 0.15 [stat] +/- 0.06 [syst] Using an isospin analysis of B->rhorho decays we determine the angle alpha of the unitarity triangle. One of the two solutions, alpha = [74, 117] degrees at 68% CL, is compatible with the standard model. All results presented here are preliminary.

Original language	English
Title of host publication	International Journal of Modern Physics A
Subtitle of host publication	SPECIAL ISSUE: Plenary Talks of the 33rd International Conference on High Energy Physics (ICHEP'06), Moscow, Russia 26 July–2 August 2006; Editors: Alexey Sissakian, Gennady Kozlov and Elena Kolganova (Joint Institute for Nuclear Research, Russia)
Number of pages	21
Volume	22
Edition	30
Publication status	Published - 2006
Event	33rd International Conference on High-Energy Physics - Moscow, Russian Federation Duration: 26 Jul 2006 → 2 Aug 2006

Conference

Conference	33rd International Conference on High-Energy Physics
Abbreviated title	ICHEP '06
Country/Territory	Russian Federation
City	Moscow
Period	26/07/06 → 2/08/06

Cite this

The BaBar Collaboration (2006). Updated measurement of the CKM angle $\alpha$ using $B^0 \to \rho^ + \rho^ - $ decays. In International Journal of Modern Physics A: SPECIAL ISSUE: Plenary Talks of the 33rd International Conference on High Energy Physics (ICHEP'06), Moscow, Russia 26 July–2 August 2006; Editors: Alexey Sissakian, Gennady Kozlov and Elena Kolganova (Joint Institute for Nuclear Research, Russia) (30 ed., Vol. 22)

The BaBar Collaboration. / Updated measurement of the CKM angle $\alpha$ using $B^0 \to \rho^ + \rho^ - $ decays. International Journal of Modern Physics A: SPECIAL ISSUE: Plenary Talks of the 33rd International Conference on High Energy Physics (ICHEP'06), Moscow, Russia 26 July–2 August 2006; Editors: Alexey Sissakian, Gennady Kozlov and Elena Kolganova (Joint Institute for Nuclear Research, Russia). Vol. 22 30. ed. 2006.

@inproceedings{7c9e324cfcc14b33b552e2ec589d430a,

title = "Updated measurement of the CKM angle $\alpha$ using $B^0 \to \rho^ + \rho^ - $ decays",

abstract = "We present results from an analysis of B0->rho+rho- using 316fb^-1 of Y(4S) -> B0B0bar decays observed with the BaBar detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure the B0->rho+rho- branching fraction, longitudinal polarization fraction fL, and the CP-violating parameters S_LONG and C_LONG: B(B0->rho+rho-) = (23.5 +/- 2.2 [stat] +/- 4.1 [syst]) * 10^-6, fL = 0.977 +/- 0.024 [stat] +0.015/-0.013 [syst] S_LONG = -0.19 +/- 0.21 [stat] +0.05/-0.07 [syst] C_LONG = -0.07 +/- 0.15 [stat] +/- 0.06 [syst] Using an isospin analysis of B->rhorho decays we determine the angle alpha of the unitarity triangle. One of the two solutions, alpha = [74, 117] degrees at 68% CL, is compatible with the standard model. All results presented here are preliminary.",

author = "George Lafferty and Nicholas Barlow and Roger Barlow and Yaw Chia and Christina Edgar and Mitchell Naisbit and Jennifer Williams and Jong Yi and {The BaBar Collaboration}",

year = "2006",

language = "English",

volume = "22",

booktitle = "International Journal of Modern Physics A",

edition = "30",

note = "33rd International Conference on High-Energy Physics, ICHEP '06 ; Conference date: 26-07-2006 Through 02-08-2006",

}

The BaBar Collaboration 2006, Updated measurement of the CKM angle $\alpha$ using $B^0 \to \rho^ + \rho^ - $ decays. in International Journal of Modern Physics A: SPECIAL ISSUE: Plenary Talks of the 33rd International Conference on High Energy Physics (ICHEP'06), Moscow, Russia 26 July–2 August 2006; Editors: Alexey Sissakian, Gennady Kozlov and Elena Kolganova (Joint Institute for Nuclear Research, Russia). 30 edn, vol. 22, 33rd International Conference on High-Energy Physics, Moscow, Russian Federation, 26/07/06.

Updated measurement of the CKM angle $\alpha$ using $B^0 \to \rho^ + \rho^ - $ decays. / The BaBar Collaboration.
International Journal of Modern Physics A: SPECIAL ISSUE: Plenary Talks of the 33rd International Conference on High Energy Physics (ICHEP'06), Moscow, Russia 26 July–2 August 2006; Editors: Alexey Sissakian, Gennady Kozlov and Elena Kolganova (Joint Institute for Nuclear Research, Russia). Vol. 22 30. ed. 2006.

Research output: Chapter in Book/Conference proceeding › Conference contribution

TY - GEN

T1 - Updated measurement of the CKM angle $\alpha$ using $B^0 \to \rho^ + \rho^ - $ decays

AU - Lafferty, George

AU - Barlow, Nicholas

AU - Barlow, Roger

AU - Chia, Yaw

AU - Edgar, Christina

AU - Naisbit, Mitchell

AU - Williams, Jennifer

AU - Yi, Jong

AU - The BaBar Collaboration

PY - 2006

Y1 - 2006

N2 - We present results from an analysis of B0->rho+rho- using 316fb^-1 of Y(4S) -> B0B0bar decays observed with the BaBar detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure the B0->rho+rho- branching fraction, longitudinal polarization fraction fL, and the CP-violating parameters S_LONG and C_LONG: B(B0->rho+rho-) = (23.5 +/- 2.2 [stat] +/- 4.1 [syst]) * 10^-6, fL = 0.977 +/- 0.024 [stat] +0.015/-0.013 [syst] S_LONG = -0.19 +/- 0.21 [stat] +0.05/-0.07 [syst] C_LONG = -0.07 +/- 0.15 [stat] +/- 0.06 [syst] Using an isospin analysis of B->rhorho decays we determine the angle alpha of the unitarity triangle. One of the two solutions, alpha = [74, 117] degrees at 68% CL, is compatible with the standard model. All results presented here are preliminary.

AB - We present results from an analysis of B0->rho+rho- using 316fb^-1 of Y(4S) -> B0B0bar decays observed with the BaBar detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure the B0->rho+rho- branching fraction, longitudinal polarization fraction fL, and the CP-violating parameters S_LONG and C_LONG: B(B0->rho+rho-) = (23.5 +/- 2.2 [stat] +/- 4.1 [syst]) * 10^-6, fL = 0.977 +/- 0.024 [stat] +0.015/-0.013 [syst] S_LONG = -0.19 +/- 0.21 [stat] +0.05/-0.07 [syst] C_LONG = -0.07 +/- 0.15 [stat] +/- 0.06 [syst] Using an isospin analysis of B->rhorho decays we determine the angle alpha of the unitarity triangle. One of the two solutions, alpha = [74, 117] degrees at 68% CL, is compatible with the standard model. All results presented here are preliminary.

M3 - Conference contribution

VL - 22

BT - International Journal of Modern Physics A

T2 - 33rd International Conference on High-Energy Physics

Y2 - 26 July 2006 through 2 August 2006

ER -

The BaBar Collaboration. Updated measurement of the CKM angle $\alpha$ using $B^0 \to \rho^ + \rho^ - $ decays. In International Journal of Modern Physics A: SPECIAL ISSUE: Plenary Talks of the 33rd International Conference on High Energy Physics (ICHEP'06), Moscow, Russia 26 July–2 August 2006; Editors: Alexey Sissakian, Gennady Kozlov and Elena Kolganova (Joint Institute for Nuclear Research, Russia). 30 ed. Vol. 22. 2006

Updated measurement of the CKM angle $\alpha$ using $B^0 \to \rho^ + \rho^ - $ decays

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