Hadronic transitions Υ(2S)→Υ(1S)

Using a 73.6 pb-1 data sample of Υ(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Υ(2S) and the Υ(1S). The dipion transition Υ(2S)→Υ(1S)π+π- was studied using two different analysis techniques. Selecting...
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Autor*in:	P. Alexander, J. Baker, R. Bebek, C. Berger, B. E. Berkelman, K. Bloom, K. Boisvert, V. Cassel, D. G. Crowcroft, D. S. Dickson, M. von Dombrowski, S. Drell, P. S. Ecklund, K. M. Ehrlich, R. Foland, A. D. Gaidarev, P. Galik, R. S. Gibbons, L. Gittelman, B. Gray, S. W. Hartill, D. L. Heltsley, B. K. Hopman, P. I. Kandaswamy, J. Kim, P. C. Kreinick, D. L. Lee, T. Liu, Y. Mistry, N. B. Ng, C. R. Nordberg, E. Ogg, M. Patterson, J. R. Peterson, D. Riley, D. Soffer, A. Valant-Spaight, B. Ward, C.

Format:	E-Artikel

Erschienen:	1998

Umfang:	Online-Ressource 15

Reproduktion:	APS Digital Backfile Archive 1893-2003
Übergeordnetes Werk:	Enthalten in: Physical review / D - [S.l.] : Soc., 1970, 58(1998), 5
Übergeordnetes Werk:	volume:58 ; year:1998 ; number:5 ; extent:15

Links:	Link aufrufen

Katalog-ID:	NLEJ25003512X

Internformat


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245	1	0	\|a Hadronic transitions Υ(2S)→Υ(1S)
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520			\|a Using a 73.6 pb-1 data sample of Υ(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Υ(2S) and the Υ(1S). The dipion transition Υ(2S)→Υ(1S)π+π- was studied using two different analysis techniques. Selecting events in which Υ(1S)→e+e-,μ+μ- (“exclusive” analysis), and using the Υ(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Υ(2S)→Υ(1S)π+π-)=0.189±0.004±0.010, while using a method allowing Υ(1S)→anything (“inclusive” analysis) we obtained B(Υ(2S)→Υ(1S)π+π-)=0.196±0.002±0.010. The appropriate weighted average of the two measurements gives B(Υ(2S)→Υ(1S)π+π-)=0.192±0.002±0.010. Combining the exclusive and inclusive results we derive the Υ(1S) leptonic branching fractions Bee=0.0229±0.0008±0.0011 and Bμμ=0.0249±0.0008±0.0013. We also studied Υ(2S)→Υ(1S)π0π0 and obtained B(Υ(2S)→Υ(1S)π0π0)=0.092±0.006±0.008. Parameters of the ππ system (dipion invariant mass spectra, angular distributions) were analyzed and found to be consistent with current theoretical models. Lastly, we searched for the η and single π0 transitions and obtained the 90% confidence level upper limits B(Υ(2S)→Υ(1S)η)<0.0028 and B(Υ(2S)→Υ(1S)π0)<0.0011.
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700	1		\|a P. Alexander, J. \|4 oth
700	1		\|a Baker, R. \|4 oth
700	1		\|a Bebek, C. \|4 oth
700	1		\|a Berger, B. E. \|4 oth
700	1		\|a Berkelman, K. \|4 oth
700	1		\|a Bloom, K. \|4 oth
700	1		\|a Boisvert, V. \|4 oth
700	1		\|a Cassel, D. G. \|4 oth
700	1		\|a Crowcroft, D. S. \|4 oth
700	1		\|a Dickson, M. \|4 oth
700	1		\|a von Dombrowski, S. \|4 oth
700	1		\|a Drell, P. S. \|4 oth
700	1		\|a Ecklund, K. M. \|4 oth
700	1		\|a Ehrlich, R. \|4 oth
700	1		\|a Foland, A. D. \|4 oth
700	1		\|a Gaidarev, P. \|4 oth
700	1		\|a Galik, R. S. \|4 oth
700	1		\|a Gibbons, L. \|4 oth
700	1		\|a Gittelman, B. \|4 oth
700	1		\|a Gray, S. W. \|4 oth
700	1		\|a Hartill, D. L. \|4 oth
700	1		\|a Heltsley, B. K. \|4 oth
700	1		\|a Hopman, P. I. \|4 oth
700	1		\|a Kandaswamy, J. \|4 oth
700	1		\|a Kim, P. C. \|4 oth
700	1		\|a Kreinick, D. L. \|4 oth
700	1		\|a Lee, T. \|4 oth
700	1		\|a Liu, Y. \|4 oth
700	1		\|a Mistry, N. B. \|4 oth
700	1		\|a Ng, C. R. \|4 oth
700	1		\|a Nordberg, E. \|4 oth
700	1		\|a Ogg, M. \|4 oth
700	1		\|a Patterson, J. R. \|4 oth
700	1		\|a Peterson, D. \|4 oth
700	1		\|a Riley, D. \|4 oth
700	1		\|a Soffer, A. \|4 oth
700	1		\|a Valant-Spaight, B. \|4 oth
700	1		\|a Ward, C. \|4 oth
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Indexfelder

matchkey_str	article:15502368:1998----::arncrni
hierarchy_sort_str	1998
publishDate	1998
allfields	(DE-627)NLEJ25003512X (DE-601)aps:d2021429ad57109c81cf5439be05afbb2ea78c73 DE-627 ger DE-627 rakwb Hadronic transitions Υ(2S)→Υ(1S) 1998 Online-Ressource 15 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Using a 73.6 pb-1 data sample of Υ(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Υ(2S) and the Υ(1S). The dipion transition Υ(2S)→Υ(1S)π+π- was studied using two different analysis techniques. Selecting events in which Υ(1S)→e+e-,μ+μ- (“exclusive” analysis), and using the Υ(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Υ(2S)→Υ(1S)π+π-)=0.189±0.004±0.010, while using a method allowing Υ(1S)→anything (“inclusive” analysis) we obtained B(Υ(2S)→Υ(1S)π+π-)=0.196±0.002±0.010. The appropriate weighted average of the two measurements gives B(Υ(2S)→Υ(1S)π+π-)=0.192±0.002±0.010. Combining the exclusive and inclusive results we derive the Υ(1S) leptonic branching fractions Bee=0.0229±0.0008±0.0011 and Bμμ=0.0249±0.0008±0.0013. We also studied Υ(2S)→Υ(1S)π0π0 and obtained B(Υ(2S)→Υ(1S)π0π0)=0.092±0.006±0.008. Parameters of the ππ system (dipion invariant mass spectra, angular distributions) were analyzed and found to be consistent with current theoretical models. Lastly, we searched for the η and single π0 transitions and obtained the 90% confidence level upper limits B(Υ(2S)→Υ(1S)η)<0.0028 and B(Υ(2S)→Υ(1S)π0)<0.0011. APS Digital Backfile Archive 1893-2003 P. Alexander, J. oth Baker, R. oth Bebek, C. oth Berger, B. E. oth Berkelman, K. oth Bloom, K. oth Boisvert, V. oth Cassel, D. G. oth Crowcroft, D. S. oth Dickson, M. oth von Dombrowski, S. oth Drell, P. S. oth Ecklund, K. M. oth Ehrlich, R. oth Foland, A. D. oth Gaidarev, P. oth Galik, R. S. oth Gibbons, L. oth Gittelman, B. oth Gray, S. W. oth Hartill, D. L. oth Heltsley, B. K. oth Hopman, P. I. oth Kandaswamy, J. oth Kim, P. C. oth Kreinick, D. L. oth Lee, T. oth Liu, Y. oth Mistry, N. B. oth Ng, C. R. oth Nordberg, E. oth Ogg, M. oth Patterson, J. R. oth Peterson, D. oth Riley, D. oth Soffer, A. oth Valant-Spaight, B. oth Ward, C. oth Enthalten in Physical review / D [S.l.] : Soc., 1970 58(1998), 5 Online-Ressource (DE-627)NLEJ248237861 (DE-600)1461167-3 1550-2368 nnns volume:58 year:1998 number:5 extent:15 https://www.tib.eu/de/suchen/id/aps%3Ad2021429ad57109c81cf5439be05afbb2ea78c73 Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 58 1998 5 15
spelling	(DE-627)NLEJ25003512X (DE-601)aps:d2021429ad57109c81cf5439be05afbb2ea78c73 DE-627 ger DE-627 rakwb Hadronic transitions Υ(2S)→Υ(1S) 1998 Online-Ressource 15 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Using a 73.6 pb-1 data sample of Υ(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Υ(2S) and the Υ(1S). The dipion transition Υ(2S)→Υ(1S)π+π- was studied using two different analysis techniques. Selecting events in which Υ(1S)→e+e-,μ+μ- (“exclusive” analysis), and using the Υ(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Υ(2S)→Υ(1S)π+π-)=0.189±0.004±0.010, while using a method allowing Υ(1S)→anything (“inclusive” analysis) we obtained B(Υ(2S)→Υ(1S)π+π-)=0.196±0.002±0.010. The appropriate weighted average of the two measurements gives B(Υ(2S)→Υ(1S)π+π-)=0.192±0.002±0.010. Combining the exclusive and inclusive results we derive the Υ(1S) leptonic branching fractions Bee=0.0229±0.0008±0.0011 and Bμμ=0.0249±0.0008±0.0013. We also studied Υ(2S)→Υ(1S)π0π0 and obtained B(Υ(2S)→Υ(1S)π0π0)=0.092±0.006±0.008. Parameters of the ππ system (dipion invariant mass spectra, angular distributions) were analyzed and found to be consistent with current theoretical models. Lastly, we searched for the η and single π0 transitions and obtained the 90% confidence level upper limits B(Υ(2S)→Υ(1S)η)<0.0028 and B(Υ(2S)→Υ(1S)π0)<0.0011. APS Digital Backfile Archive 1893-2003 P. Alexander, J. oth Baker, R. oth Bebek, C. oth Berger, B. E. oth Berkelman, K. oth Bloom, K. oth Boisvert, V. oth Cassel, D. G. oth Crowcroft, D. S. oth Dickson, M. oth von Dombrowski, S. oth Drell, P. S. oth Ecklund, K. M. oth Ehrlich, R. oth Foland, A. D. oth Gaidarev, P. oth Galik, R. S. oth Gibbons, L. oth Gittelman, B. oth Gray, S. W. oth Hartill, D. L. oth Heltsley, B. K. oth Hopman, P. I. oth Kandaswamy, J. oth Kim, P. C. oth Kreinick, D. L. oth Lee, T. oth Liu, Y. oth Mistry, N. B. oth Ng, C. R. oth Nordberg, E. oth Ogg, M. oth Patterson, J. R. oth Peterson, D. oth Riley, D. oth Soffer, A. oth Valant-Spaight, B. oth Ward, C. oth Enthalten in Physical review / D [S.l.] : Soc., 1970 58(1998), 5 Online-Ressource (DE-627)NLEJ248237861 (DE-600)1461167-3 1550-2368 nnns volume:58 year:1998 number:5 extent:15 https://www.tib.eu/de/suchen/id/aps%3Ad2021429ad57109c81cf5439be05afbb2ea78c73 Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 58 1998 5 15
allfields_unstemmed	(DE-627)NLEJ25003512X (DE-601)aps:d2021429ad57109c81cf5439be05afbb2ea78c73 DE-627 ger DE-627 rakwb Hadronic transitions Υ(2S)→Υ(1S) 1998 Online-Ressource 15 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Using a 73.6 pb-1 data sample of Υ(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Υ(2S) and the Υ(1S). The dipion transition Υ(2S)→Υ(1S)π+π- was studied using two different analysis techniques. Selecting events in which Υ(1S)→e+e-,μ+μ- (“exclusive” analysis), and using the Υ(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Υ(2S)→Υ(1S)π+π-)=0.189±0.004±0.010, while using a method allowing Υ(1S)→anything (“inclusive” analysis) we obtained B(Υ(2S)→Υ(1S)π+π-)=0.196±0.002±0.010. The appropriate weighted average of the two measurements gives B(Υ(2S)→Υ(1S)π+π-)=0.192±0.002±0.010. Combining the exclusive and inclusive results we derive the Υ(1S) leptonic branching fractions Bee=0.0229±0.0008±0.0011 and Bμμ=0.0249±0.0008±0.0013. We also studied Υ(2S)→Υ(1S)π0π0 and obtained B(Υ(2S)→Υ(1S)π0π0)=0.092±0.006±0.008. Parameters of the ππ system (dipion invariant mass spectra, angular distributions) were analyzed and found to be consistent with current theoretical models. Lastly, we searched for the η and single π0 transitions and obtained the 90% confidence level upper limits B(Υ(2S)→Υ(1S)η)<0.0028 and B(Υ(2S)→Υ(1S)π0)<0.0011. APS Digital Backfile Archive 1893-2003 P. Alexander, J. oth Baker, R. oth Bebek, C. oth Berger, B. E. oth Berkelman, K. oth Bloom, K. oth Boisvert, V. oth Cassel, D. G. oth Crowcroft, D. S. oth Dickson, M. oth von Dombrowski, S. oth Drell, P. S. oth Ecklund, K. M. oth Ehrlich, R. oth Foland, A. D. oth Gaidarev, P. oth Galik, R. S. oth Gibbons, L. oth Gittelman, B. oth Gray, S. W. oth Hartill, D. L. oth Heltsley, B. K. oth Hopman, P. I. oth Kandaswamy, J. oth Kim, P. C. oth Kreinick, D. L. oth Lee, T. oth Liu, Y. oth Mistry, N. B. oth Ng, C. R. oth Nordberg, E. oth Ogg, M. oth Patterson, J. R. oth Peterson, D. oth Riley, D. oth Soffer, A. oth Valant-Spaight, B. oth Ward, C. oth Enthalten in Physical review / D [S.l.] : Soc., 1970 58(1998), 5 Online-Ressource (DE-627)NLEJ248237861 (DE-600)1461167-3 1550-2368 nnns volume:58 year:1998 number:5 extent:15 https://www.tib.eu/de/suchen/id/aps%3Ad2021429ad57109c81cf5439be05afbb2ea78c73 Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 58 1998 5 15
allfieldsGer	(DE-627)NLEJ25003512X (DE-601)aps:d2021429ad57109c81cf5439be05afbb2ea78c73 DE-627 ger DE-627 rakwb Hadronic transitions Υ(2S)→Υ(1S) 1998 Online-Ressource 15 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Using a 73.6 pb-1 data sample of Υ(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Υ(2S) and the Υ(1S). The dipion transition Υ(2S)→Υ(1S)π+π- was studied using two different analysis techniques. Selecting events in which Υ(1S)→e+e-,μ+μ- (“exclusive” analysis), and using the Υ(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Υ(2S)→Υ(1S)π+π-)=0.189±0.004±0.010, while using a method allowing Υ(1S)→anything (“inclusive” analysis) we obtained B(Υ(2S)→Υ(1S)π+π-)=0.196±0.002±0.010. The appropriate weighted average of the two measurements gives B(Υ(2S)→Υ(1S)π+π-)=0.192±0.002±0.010. Combining the exclusive and inclusive results we derive the Υ(1S) leptonic branching fractions Bee=0.0229±0.0008±0.0011 and Bμμ=0.0249±0.0008±0.0013. We also studied Υ(2S)→Υ(1S)π0π0 and obtained B(Υ(2S)→Υ(1S)π0π0)=0.092±0.006±0.008. Parameters of the ππ system (dipion invariant mass spectra, angular distributions) were analyzed and found to be consistent with current theoretical models. Lastly, we searched for the η and single π0 transitions and obtained the 90% confidence level upper limits B(Υ(2S)→Υ(1S)η)<0.0028 and B(Υ(2S)→Υ(1S)π0)<0.0011. APS Digital Backfile Archive 1893-2003 P. Alexander, J. oth Baker, R. oth Bebek, C. oth Berger, B. E. oth Berkelman, K. oth Bloom, K. oth Boisvert, V. oth Cassel, D. G. oth Crowcroft, D. S. oth Dickson, M. oth von Dombrowski, S. oth Drell, P. S. oth Ecklund, K. M. oth Ehrlich, R. oth Foland, A. D. oth Gaidarev, P. oth Galik, R. S. oth Gibbons, L. oth Gittelman, B. oth Gray, S. W. oth Hartill, D. L. oth Heltsley, B. K. oth Hopman, P. I. oth Kandaswamy, J. oth Kim, P. C. oth Kreinick, D. L. oth Lee, T. oth Liu, Y. oth Mistry, N. B. oth Ng, C. R. oth Nordberg, E. oth Ogg, M. oth Patterson, J. R. oth Peterson, D. oth Riley, D. oth Soffer, A. oth Valant-Spaight, B. oth Ward, C. oth Enthalten in Physical review / D [S.l.] : Soc., 1970 58(1998), 5 Online-Ressource (DE-627)NLEJ248237861 (DE-600)1461167-3 1550-2368 nnns volume:58 year:1998 number:5 extent:15 https://www.tib.eu/de/suchen/id/aps%3Ad2021429ad57109c81cf5439be05afbb2ea78c73 Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 58 1998 5 15
allfieldsSound	(DE-627)NLEJ25003512X (DE-601)aps:d2021429ad57109c81cf5439be05afbb2ea78c73 DE-627 ger DE-627 rakwb Hadronic transitions Υ(2S)→Υ(1S) 1998 Online-Ressource 15 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Using a 73.6 pb-1 data sample of Υ(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Υ(2S) and the Υ(1S). The dipion transition Υ(2S)→Υ(1S)π+π- was studied using two different analysis techniques. Selecting events in which Υ(1S)→e+e-,μ+μ- (“exclusive” analysis), and using the Υ(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Υ(2S)→Υ(1S)π+π-)=0.189±0.004±0.010, while using a method allowing Υ(1S)→anything (“inclusive” analysis) we obtained B(Υ(2S)→Υ(1S)π+π-)=0.196±0.002±0.010. The appropriate weighted average of the two measurements gives B(Υ(2S)→Υ(1S)π+π-)=0.192±0.002±0.010. Combining the exclusive and inclusive results we derive the Υ(1S) leptonic branching fractions Bee=0.0229±0.0008±0.0011 and Bμμ=0.0249±0.0008±0.0013. We also studied Υ(2S)→Υ(1S)π0π0 and obtained B(Υ(2S)→Υ(1S)π0π0)=0.092±0.006±0.008. Parameters of the ππ system (dipion invariant mass spectra, angular distributions) were analyzed and found to be consistent with current theoretical models. Lastly, we searched for the η and single π0 transitions and obtained the 90% confidence level upper limits B(Υ(2S)→Υ(1S)η)<0.0028 and B(Υ(2S)→Υ(1S)π0)<0.0011. APS Digital Backfile Archive 1893-2003 P. Alexander, J. oth Baker, R. oth Bebek, C. oth Berger, B. E. oth Berkelman, K. oth Bloom, K. oth Boisvert, V. oth Cassel, D. G. oth Crowcroft, D. S. oth Dickson, M. oth von Dombrowski, S. oth Drell, P. S. oth Ecklund, K. M. oth Ehrlich, R. oth Foland, A. D. oth Gaidarev, P. oth Galik, R. S. oth Gibbons, L. oth Gittelman, B. oth Gray, S. W. oth Hartill, D. L. oth Heltsley, B. K. oth Hopman, P. I. oth Kandaswamy, J. oth Kim, P. C. oth Kreinick, D. L. oth Lee, T. oth Liu, Y. oth Mistry, N. B. oth Ng, C. R. oth Nordberg, E. oth Ogg, M. oth Patterson, J. R. oth Peterson, D. oth Riley, D. oth Soffer, A. oth Valant-Spaight, B. oth Ward, C. oth Enthalten in Physical review / D [S.l.] : Soc., 1970 58(1998), 5 Online-Ressource (DE-627)NLEJ248237861 (DE-600)1461167-3 1550-2368 nnns volume:58 year:1998 number:5 extent:15 https://www.tib.eu/de/suchen/id/aps%3Ad2021429ad57109c81cf5439be05afbb2ea78c73 Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 58 1998 5 15
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topic_title	Hadronic transitions Υ(2S)→Υ(1S)
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title	Hadronic transitions Υ(2S)→Υ(1S)
spellingShingle	Hadronic transitions Υ(2S)→Υ(1S)
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title_full	Hadronic transitions Υ(2S)→Υ(1S)
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title_sort	hadronic transitions υ(2s)→υ(1s)
title_auth	Hadronic transitions Υ(2S)→Υ(1S)
abstract	Using a 73.6 pb-1 data sample of Υ(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Υ(2S) and the Υ(1S). The dipion transition Υ(2S)→Υ(1S)π+π- was studied using two different analysis techniques. Selecting events in which Υ(1S)→e+e-,μ+μ- (“exclusive” analysis), and using the Υ(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Υ(2S)→Υ(1S)π+π-)=0.189±0.004±0.010, while using a method allowing Υ(1S)→anything (“inclusive” analysis) we obtained B(Υ(2S)→Υ(1S)π+π-)=0.196±0.002±0.010. The appropriate weighted average of the two measurements gives B(Υ(2S)→Υ(1S)π+π-)=0.192±0.002±0.010. Combining the exclusive and inclusive results we derive the Υ(1S) leptonic branching fractions Bee=0.0229±0.0008±0.0011 and Bμμ=0.0249±0.0008±0.0013. We also studied Υ(2S)→Υ(1S)π0π0 and obtained B(Υ(2S)→Υ(1S)π0π0)=0.092±0.006±0.008. Parameters of the ππ system (dipion invariant mass spectra, angular distributions) were analyzed and found to be consistent with current theoretical models. Lastly, we searched for the η and single π0 transitions and obtained the 90% confidence level upper limits B(Υ(2S)→Υ(1S)η)<0.0028 and B(Υ(2S)→Υ(1S)π0)<0.0011.
abstractGer	Using a 73.6 pb-1 data sample of Υ(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Υ(2S) and the Υ(1S). The dipion transition Υ(2S)→Υ(1S)π+π- was studied using two different analysis techniques. Selecting events in which Υ(1S)→e+e-,μ+μ- (“exclusive” analysis), and using the Υ(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Υ(2S)→Υ(1S)π+π-)=0.189±0.004±0.010, while using a method allowing Υ(1S)→anything (“inclusive” analysis) we obtained B(Υ(2S)→Υ(1S)π+π-)=0.196±0.002±0.010. The appropriate weighted average of the two measurements gives B(Υ(2S)→Υ(1S)π+π-)=0.192±0.002±0.010. Combining the exclusive and inclusive results we derive the Υ(1S) leptonic branching fractions Bee=0.0229±0.0008±0.0011 and Bμμ=0.0249±0.0008±0.0013. We also studied Υ(2S)→Υ(1S)π0π0 and obtained B(Υ(2S)→Υ(1S)π0π0)=0.092±0.006±0.008. Parameters of the ππ system (dipion invariant mass spectra, angular distributions) were analyzed and found to be consistent with current theoretical models. Lastly, we searched for the η and single π0 transitions and obtained the 90% confidence level upper limits B(Υ(2S)→Υ(1S)η)<0.0028 and B(Υ(2S)→Υ(1S)π0)<0.0011.
abstract_unstemmed	Using a 73.6 pb-1 data sample of Υ(2S) events collected with the CLEO II detector at the Cornell Electron Storage Ring, we have investigated the hadronic transitions between the Υ(2S) and the Υ(1S). The dipion transition Υ(2S)→Υ(1S)π+π- was studied using two different analysis techniques. Selecting events in which Υ(1S)→e+e-,μ+μ- (“exclusive” analysis), and using the Υ(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Υ(2S)→Υ(1S)π+π-)=0.189±0.004±0.010, while using a method allowing Υ(1S)→anything (“inclusive” analysis) we obtained B(Υ(2S)→Υ(1S)π+π-)=0.196±0.002±0.010. The appropriate weighted average of the two measurements gives B(Υ(2S)→Υ(1S)π+π-)=0.192±0.002±0.010. Combining the exclusive and inclusive results we derive the Υ(1S) leptonic branching fractions Bee=0.0229±0.0008±0.0011 and Bμμ=0.0249±0.0008±0.0013. We also studied Υ(2S)→Υ(1S)π0π0 and obtained B(Υ(2S)→Υ(1S)π0π0)=0.092±0.006±0.008. Parameters of the ππ system (dipion invariant mass spectra, angular distributions) were analyzed and found to be consistent with current theoretical models. Lastly, we searched for the η and single π0 transitions and obtained the 90% confidence level upper limits B(Υ(2S)→Υ(1S)η)<0.0028 and B(Υ(2S)→Υ(1S)π0)<0.0011.
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title_short	Hadronic transitions Υ(2S)→Υ(1S)
url	https://www.tib.eu/de/suchen/id/aps%3Ad2021429ad57109c81cf5439be05afbb2ea78c73
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author2	P. Alexander, J. Baker, R. Bebek, C. Berger, B. E. Berkelman, K. Bloom, K. Boisvert, V. Cassel, D. G. Crowcroft, D. S. Dickson, M. von Dombrowski, S. Drell, P. S. Ecklund, K. M. Ehrlich, R. Foland, A. D. Gaidarev, P. Galik, R. S. Gibbons, L. Gittelman, B. Gray, S. W. Hartill, D. L. Heltsley, B. K. Hopman, P. I. Kandaswamy, J. Kim, P. C. Kreinick, D. L. Lee, T. Liu, Y. Mistry, N. B. Ng, C. R. Nordberg, E. Ogg, M. Patterson, J. R. Peterson, D. Riley, D. Soffer, A. Valant-Spaight, B. Ward, C.
author2Str	P. Alexander, J. Baker, R. Bebek, C. Berger, B. E. Berkelman, K. Bloom, K. Boisvert, V. Cassel, D. G. Crowcroft, D. S. Dickson, M. von Dombrowski, S. Drell, P. S. Ecklund, K. M. Ehrlich, R. Foland, A. D. Gaidarev, P. Galik, R. S. Gibbons, L. Gittelman, B. Gray, S. W. Hartill, D. L. Heltsley, B. K. Hopman, P. I. Kandaswamy, J. Kim, P. C. Kreinick, D. L. Lee, T. Liu, Y. Mistry, N. B. Ng, C. R. Nordberg, E. Ogg, M. Patterson, J. R. Peterson, D. Riley, D. Soffer, A. Valant-Spaight, B. Ward, C.
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up_date	2024-07-06T06:46:15.652Z
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Hadronic transitions Υ(2S)→Υ(1S)

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Vorhandene Bände

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