Measurement of CP-violating asymmetries in D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays at CDF
We report on a measurement of CP-violating asymmetries (ACP) in the Cabibbo-suppressed D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays reconstructed in a data sample corresponding to 5.9 fb[superscript -1] of integrated luminosity col...
| Main Authors: | , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2012
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| Online Access: | http://hdl.handle.net/1721.1/72104 https://orcid.org/0000-0002-6047-4211 |
| _version_ | 1826202261387214848 |
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| author | Gomez-Ceballos, Guillelmo Goncharov, Maxim Paus, Christoph M. E. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Gomez-Ceballos, Guillelmo Goncharov, Maxim Paus, Christoph M. E. |
| author_sort | Gomez-Ceballos, Guillelmo |
| collection | MIT |
| description | We report on a measurement of CP-violating asymmetries (ACP) in the Cabibbo-suppressed D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays reconstructed in a data sample corresponding to 5.9 fb[superscript -1] of integrated luminosity collected by the upgraded Collider Detector at Fermilab. We use the strong decay D[superscript *+]→D[superscript 0]π[superscript +] to identify the flavor of the charmed meson at production and exploit CP-conserving strong cc̅ pair production in pp̅ collisions. High-statistics samples of Cabibbo-favored D[superscript 0]→K[superscript -]π[superscript +] decays with and without a D[superscript *±] tag are used to correct for instrumental effects and significantly reduce systematic uncertainties. We measure ACP(D[superscript 0]→π[superscript +]π[superscript -])=(+0.22±0.24(stat)±0.11(syst))% and A[subscript CP](D[superscript 0]→K[superscript +]K [superscript -] )=(-0.24±0.22(stat)±0.09(syst))%, in agreement with CP conservation. These are the most precise determinations from a single experiment to date. Under the assumption of negligible direct CP violation in D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays, the results provide an upper limit to the CP-violating asymmetry in D[superscript 0] mixing, |A[subscript CP][superscript ind](D[superscript 0])|<0.13% at the 90% confidence level. |
| first_indexed | 2024-09-23T12:04:43Z |
| format | Article |
| id | mit-1721.1/72104 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T12:04:43Z |
| publishDate | 2012 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/721042022-10-01T07:59:56Z Measurement of CP-violating asymmetries in D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays at CDF Gomez-Ceballos, Guillelmo Goncharov, Maxim Paus, Christoph M. E. Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Paus, Christoph M. E. Gomez-Ceballos, Guillelmo Goncharov, Maxim Paus, Christoph M. E. We report on a measurement of CP-violating asymmetries (ACP) in the Cabibbo-suppressed D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays reconstructed in a data sample corresponding to 5.9 fb[superscript -1] of integrated luminosity collected by the upgraded Collider Detector at Fermilab. We use the strong decay D[superscript *+]→D[superscript 0]π[superscript +] to identify the flavor of the charmed meson at production and exploit CP-conserving strong cc̅ pair production in pp̅ collisions. High-statistics samples of Cabibbo-favored D[superscript 0]→K[superscript -]π[superscript +] decays with and without a D[superscript *±] tag are used to correct for instrumental effects and significantly reduce systematic uncertainties. We measure ACP(D[superscript 0]→π[superscript +]π[superscript -])=(+0.22±0.24(stat)±0.11(syst))% and A[subscript CP](D[superscript 0]→K[superscript +]K [superscript -] )=(-0.24±0.22(stat)±0.09(syst))%, in agreement with CP conservation. These are the most precise determinations from a single experiment to date. Under the assumption of negligible direct CP violation in D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays, the results provide an upper limit to the CP-violating asymmetry in D[superscript 0] mixing, |A[subscript CP][superscript ind](D[superscript 0])|<0.13% at the 90% confidence level. 2012-08-10T20:22:49Z 2012-08-10T20:22:49Z 2012-01 2011-11 Article http://purl.org/eprint/type/JournalArticle 1550-7998 1089-4918 http://hdl.handle.net/1721.1/72104 T. Aaltonen et al. "Measurement of CP-violating asymmetries in D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays" Physical Review D 85, 012009 (2012). © 2012 American Physical Society https://orcid.org/0000-0002-6047-4211 en_US http://dx.doi.org/10.1103/PhysRevD.85.012009 Physical Review D Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Gomez-Ceballos, Guillelmo Goncharov, Maxim Paus, Christoph M. E. Measurement of CP-violating asymmetries in D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays at CDF |
| title | Measurement of CP-violating asymmetries in D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays at CDF |
| title_full | Measurement of CP-violating asymmetries in D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays at CDF |
| title_fullStr | Measurement of CP-violating asymmetries in D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays at CDF |
| title_full_unstemmed | Measurement of CP-violating asymmetries in D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays at CDF |
| title_short | Measurement of CP-violating asymmetries in D[superscript 0]→π[superscript +]π[superscript -] and D[superscript 0]→K[superscript +]K [superscript -] decays at CDF |
| title_sort | measurement of cp violating asymmetries in d superscript 0 π superscript π superscript and d superscript 0 k superscript k superscript decays at cdf |
| url | http://hdl.handle.net/1721.1/72104 https://orcid.org/0000-0002-6047-4211 |
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