Precision Measurement of CP Violation in $D^0\to\pi^+\pi^-$ at CDF

Description

We report a preliminary measurement of the CP violating asymmetry in D{sup 0} {yields} {pi}{sup +}{pi}{sup -} using approximately 215,000 decays reconstructed in about 5.94/fb of CDF data. We use the strong D* {+-} D{sup 0}{pi}{sup +} decay (D* tag) to identify the flavor of the charmed meson at production time and exploit CP-conserving strong c-{bar c} pair-production in p-{bar p} collisions. Higher statistic samples of Cabibbo-favored D{sup 0} {yields} K{sup -}{pi}{sup +} decays with and without D* tag are used to highly suppress systematic uncertainties due to detector effects. The result is the world's most precise measurement to date.

6 pages

Creation Information

Di Canto, Angelo November 1, 2010.

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What

Description

We report a preliminary measurement of the CP violating asymmetry in D{sup 0} {yields} {pi}{sup +}{pi}{sup -} using approximately 215,000 decays reconstructed in about 5.94/fb of CDF data. We use the strong D* {+-} D{sup 0}{pi}{sup +} decay (D* tag) to identify the flavor of the charmed meson at production time and exploit CP-conserving strong c-{bar c} pair-production in p-{bar p} collisions. Higher statistic samples of Cabibbo-favored D{sup 0} {yields} K{sup -}{pi}{sup +} decays with and without D* tag are used to highly suppress systematic uncertainties due to detector effects. The result is the world's most precise measurement to date.

6 pages

Source

• Journal Name: PoS HQL2010:048,2010; Conference: Prepared for 10th International Conference on Heavy Quarks and Leptons, Frascati (Rome), Italy, 11-16 Oct 2010

Identifier

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• Report No.: FERMILAB-CONF-10-477-E
• Grant Number: AC02-07CH11359
• Office of Scientific & Technical Information Report Number: 993556

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When

Creation Date

• November 1, 2010

Added to The UNT Digital Library

• Oct. 14, 2017, 8:36 a.m.

Description Last Updated

• Oct. 24, 2017, 7:29 p.m.

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Di Canto, Angelo. Precision Measurement of CP Violation in $D^0\to\pi^+\pi^-$ at CDF, article, November 1, 2010; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1014923/: accessed December 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.