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HADRONIC TRANSITIONS Y(2S)-]Y(1S) - ART. NO. 052004

Authors

ALEXANDER JP BAKER R BEBEK C BERGER BE BERKELMAN K BLOOM K BOISVERT V CASSEL DG CROWCROFT DS DICKSON M VONDOMBROWSKI S DRELL PS ECKLUND KM EHRLICH R FOLAND AD GAIDAREV P GALIK RS GIBBONS L GITTELMAN B GRAY SW HARTILL DL HELTSLEY BK HOPMAN PI KANDASWAMY J KIM PC KREINICK DL LEE T LIU Y MISTRY NB NG CR NORDBERG E OGG M PATTERSON JR PETERSON D RILEY D SOFFER A VALANTSPAIGHT B WARD C ATHANAS M AVERY P JONES CD LOHNER M PATTON S PRESCOTT C YELTON J ZHENG J BRANDENBURG G BRIERE RA ERSHOV A GAO YS KIM DYJ WILSON R YAMAMOTO H BROWDER TE LI Y RODRIGUEZ JL BERGFELD T EISENSTEIN BI ERNST J GLADDING GE GOLLIN GD HANS RM JOHNSON E KARLINER I MARSH MA PALMER M SELEN M THALER JJ EDWARDS KW BELLERIVE A JANICEK R MACFARLANE DB PATEL PM SADOFF AJ AMMAR R BARINGER P BEAN A BESSON D COPPAGE D DARLING C DAVIS R KOTOV S KRAVCHENKO I KWAK N ZHOU L ANDERSON S KUBOTA Y LEE SJ ONEILL JJ POLING R RIEHLE T SMITH A ALAM MS ATHAR SB LING Z MAHMOOD AH TIMM S WAPPLER F ANASTASSOV A DUBOSCQ JE FUJINO D GAN KK HART T HONSCHEID K KAGAN H KASS R LEE J SPENCER MB SUNG M UNDRUS A WANKE R WOLF A ZOELLER MM NEMATI B RICHICHI SJ ROSS WR SEVERINI H SKUBIC P BISHAI M FAST J HINSON JW MENON N MILLER DH SHIBATA EI SHIPSEY IPJ YURKO M GLENN S JOHNSON SD KWON Y ROBERTS S THORNDIKE EH JESSOP CP LINGEL K MARSISKE H PERL ML SAVINOV V UGOLINI D WANG R ZHOU X COAN TE FADEYEV V KOROLKOV I MARAVIN Y NARSKY I SHELKOV V STAECK J STROYNOWSKI R VOLOBOUEV I YE J ARTUSO M AZFAR F EFIMOV A GOLDBERG M HE D KOPP S MONETI GC MOUNTAIN R SCHUH S SKWARNICKI T STONE S VIEHHAUSER G XING X BARTELT J CSORNA SE JAIN V MCLEAN KW MARKA S GODANG R KINOSHITA K LAI IC POMIANOWSKI P SCHRENK S BONVICINI G CINABRO D GREENE R PERERA LP ZHOU GJ CHADHA M CHAN S EIGEN G MILLER JS OGRADY C SCHMIDTLER M URHEIM J WEINSTEIN AJ WURTHWEIN F BLISS DW MASEK G PAAR HP PRELL S SHARMA V ASNER DM GRONBERG J HILL TS LANGE DJ MORRISON RJ NELSON HN NELSON TK ROBERTS D RYD A BALEST R BEHRENS BH FORD WT GRITSAN A PARK H ROY J SMITH JG

Citation

Jp. Alexander et al., HADRONIC TRANSITIONS Y(2S)-]Y(1S) - ART. NO. 052004, Physical review. D. Particles and fields, 5805(5), 1998, pp. 2004

Citations number

Categorie Soggetti

Physics, Particles & Fields

Journal title

Physical review. D. Particles and fields → ACNP

ISSN journal

05562821

Volume

5805

Issue

Year of publication

1998

Database

ISI

SICI code

0556-2821(1998)5805:5<2004:HTY-AN>2.0.ZU;2-9

Abstract

Using a 73.6 pb(-1) data sample of Y(2S) events collected with the CLE O II detector at the Cornell Electron Storage Ring, we have investigat ed the hadronic transitions between the Y(2S) and the T(1S). The dipio n transition Y(2S)-->Y(1S) pi(+)pi(-) was studied using two different analysis techniques. Selecting events in which Y(1S)-->e(+)e(-), mu(+) mu(-) (''exclusive'' analysis), and using the Y(1S) leptonic branching fractions world averages from the PDG review, we obtained B(Y(2S)-->Y (1S) pi(+)pi(-)) = 0.189 +/- 0.004 +/- 0.010, while using a method all owing T(1S)-->anything (''inclusive'' analysis) we obtained B(Y(2S) -- >Y(1S)pi(+)pi(-)) = 0.196 +/- 0.002 +/- 0.010. The appropriate weighte d average of the two measurements gives a(T(2S) --> Y(1S) pi(+)pi(-)) = 0.192 +/- 0.002 +/- 0.010. Combining the exclusive and inclusive res ults we derive the T(1S) leptonic branching fractions B-ee = 0.0229 +/ - 0.0008 +/- 0.0011 and B-mu mu = 0.0249 +/- 0.0008 +/- 0.0013. We als o studied Y(2S)-->Y(1S) pi(o)pi(o) and obtained B(Y(2S)-->Y(1S) pi(o)p i(o))= 0.092 +/- 0.006 +/- 0.008. Parameters of the pi pi system (dipi on invariant mass spectra, angular distributions) were analyzed and fo und to be consistent with current theoretical models. Lastly, we searc hed for the eta and single pi(o) transitions and obtained the 90% conf idence level upper limits B(Y(2S)-->(1S) eta)<0.0028 and B(Y(2S)-->(1S ) pi(o))<0.0011. [S0556-2821(98)07417-7].