Studies of quarkonia production with CDF

Conference · Fri Oct 01 00:00:00 EDT 1993

OSTI ID:10157926

Papadimitriou, V

In the 1988--89 collider run the authors studied the reactions p{anti p}{yields}J/{psi}({psi}(2S))X{yields}{mu}{sup +}{mu}{sup {minus}}X by using 2.6 {+-} 0.2 pb{sup {minus}1} of data. This allowed them to shed some light on the quarkonia production mechanisms at the Tevatron energy. The production mechanisms of the J/{psi}`s ({psi}(2S)`s) are B decays, direct charmonium production and the recently suggested gluon fragmentation. They have also reconstructed {chi}{sub c} mesons through the decay chain {chi}{sub c}{yields}J/{psi}{gamma}, J/{psi}{yields}{mu}{sup +}{mu}{sup {minus}} using the same data set. In the 1992--93 run they have approximately a factor of 5 more J/{psi}`s per pb{sup {minus}1} than in the previous run. They show the J/{psi} mass spectrum from a 12 pb{sup {minus}1} sample which represents ca 60% of the 1992--93 data. From the measurement of the average b lifetime with inclusive J/{psi}`s they have indications that the fraction of J/{psi}`s coming from b`s is lower than the one they assumed in the previous run. With the new data set they are also reconstructing a respectable sample of {chi}{sub c} decays. This sample will be used to measure the fraction f{sub {chi}} and to cross check the fraction f{sub b} measured with the SVX. Since they can now measure the J/{psi} differential cross section from b`s and from {chi}{sub c}`s, it will be much easier to disentangle the different J/{psi} production mechanisms. The authors know that several of the 1988--89 CDF b-quark cross section measurements were statistically limited or were derived under certain assumptions; they expect that the analysis of the data set they collected during the 1992--93 run will shed light onto the problem. From (14.3{+-}1.0) pb{sup {minus}1} of the 1992--93 data they also reconstructed 104{+-}21 J/{psi}K{sup {+-}} and 26{+-}8 J/{psi}K{sup 0*} events for P{sub T}{sup B}>6.0 GeV/c and P{sub T}{sup B}>9.0 GeV/c respectively. The corresponding b-quark cross sections are given.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH03000
• OSTI ID: 10157926
• Report Number(s): FNAL/C-93/291-E; CONF-9306176-23; ON: DE94013220; TRN: 94:012151
• Resource Relation: Conference: Workshop on physics at current accelerators and the supercollider,Argonne, IL (United States),2-5 Jun 1993; Other Information: PBD: Oct 1993
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QUARKONIUM
PARTICLE PRODUCTION
FERMILAB COLLIDER DETECTOR
DATA
RADIATIVE DECAY
WEAK PARTICLE DECAY
B MESONS
MASS DIFFERENCE
LIFETIME
TRANSVERSE MOMENTUM
DIFFERENTIAL CROSS SECTIONS
PROTON-ANTIPROTON INTERACTIONS
ELECTROMAGNETIC PARTICLE DECAY
662340
662350
HADRON INTERACTIONS
DECAYS OF MESONS