Production of charm mesons by high energy neutrons

Technical Report · Fri Jan 01 00:00:00 EST 1988

OSTI ID:6907509

Shipbaugh, C L

The charmed mesons D/sup /plus minus//, D/sup 0/, and D/sub s//sup /plus minus//, have been observed in neutron-nucleus collisions at the FNAL Tevatron. A sample of 134 /plus minus/ 19 events as investigated in the decay D/sup /plus minus// /yields/ D/sup 0//pi//sup /plus minus// with the subsequent decay mode D/sup 0/ /yields/ K/sup +/K/sup /minus//. The cross section per nucleon for D/sup /plus minus//, at most probable energy /radical/s = 35 GeV, was measured to be 2.11 /plus minus/ .43 (plusreverse arrowminus/.63)/mu/b/nucleon for 0.0 < x/sub f/ < 0.14 (/bar x//sub f/ = .07). The branching ratio (BR) is defined as: BR /identicalreverse arrowto/ Br(D /yields/ D/pi/) /times/ BR(D /yields/ K/sup +/K/sup /minus//). The dependence of the cross section per nucleus on number of nucleons in target was fit to a form A /sup /alpha// and it was found that /alpha/ = .96 /plusreverse arrowminus/ .17. A sample of 64 /plusreverse arrowminus/ 16 D/sub s//sup /plus minus// events was investigates for the decay D/sub s//sup /plus minus// /yields/ /phi//pi//sup /plus minus//. The differential cross section for D/sub s//sup /plus minus// production averaged over the particle and antiparticle states is: BR.(1/2)(d/sigma/(D/sub s//sup +/)/dx/sub f/ + d/sigma/(D/sub s//sup /minus//) = 2.85 /plusreverse arrowminus/ 0.80 /plusreverse arrowminus/ .86 /mu/b/nucleon at x/sub f/ = 0.175 where the first errors is statistical and the second error is systematic. The branching fraction is defined as BR /equivalentreverse arrowto/ BR(D/sub s/ /yields/ /phi//pi/), and a linear A dependence was assumed. An estimate of relative cross section is: 0.19 /plusreverse arrowminus/ 0.09 at x/sub f/ = 0. 36 refs., 43 figs., 5 tabs.

• Research Organization: Illinois Univ., Urbana (USA). Graduate Coll.
• DOE Contract Number: AC02-76ER01195
• OSTI ID: 6907509
• Report Number(s): DOE/ER/01195-T8; ON: DE88014992; TRN: 88-031172
• Resource Relation: Other Information: Thesis (Ph.D.). Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
D MESONS
PARTICLE PRODUCTION
BRANCHING RATIO
CHARM PARTICLES
CHERENKOV COUNTERS
DETECTION
DIFFERENTIAL CROSS SECTIONS
FERMILAB TEVATRON
MASS SPECTRA
MONTE CARLO METHOD
PARTICLE DECAY
PARTICLE IDENTIFICATION
ACCELERATORS
BOSONS
CHARMED MESONS
CROSS SECTIONS
CYCLIC ACCELERATORS
DECAY
ELEMENTARY PARTICLES
HADRONS
MEASURING INSTRUMENTS
MESONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
SPECTRA
SYNCHROTRONS
645103* - High Energy Physics- Particle Interactions &amp; Properties-Experimental- Strong Interactions &amp; Baryon &amp; Meson Properties