F. Dittus

Two-jet invariant-mass distribution at sqrt s =1.8 TeV.

We present the dijet invariant-mass distribution in the region between 60 and 500 GeV, measured in 1.8-TeV {ital {bar p}p} collisions in the Collider Detector at Fermilab. Jets are restricted to the pseudorapidity interval {vert bar}{eta}{vert bar}{lt}0.7. Data are compared with QCD calculations; axigluons are excluded with 95% confidence in the region 120{lt}{ital M}{sub {ital A}}{lt}210 GeV for axigluon width {Gamma}{sub {ital A}}={ital N}{alpha}{sub s}{ital M}{sub {ital A}}/6, with {ital N}=5.

Measurement of D /emph> production in jets from p̅p collisions at √s =1.8 TeV

The production rate of charged {ital D}{sup *} mesons in jets has been measured in 1.8-TeV {ital {bar p}p} collisions at the Fermilab Tevatron with the Collider Detector at Fermilab. In a sample of approximately 32 300 jets with a mean transverse energy of 47 GeV obtained from an exposure of 21.1 nb{sup {minus}1}, a signal corresponding to 25.0{plus minus}7.5(stat){plus minus}2.0(syst) {ital D}{sup *{plus minus}}{r arrow}K{sup {minus plus}}{pi}{sup {plus minus}}{pi}{sup {plus minus}} events is seen above background. This corresponds to a ratio {ital N}({ital D}{sup *+}+D{sup *{minus}})/N(jet) =0.10{plus minus}0.03{plus minus}0.03 for {ital D}{sup *} mesons with fractional momentum {ital z} greater than 0.1.

Measurement of D sup * production in jets from p p collisions at radical s =1. 8 TeV

The production rate of charged {ital D}{sup *} mesons in jets has been measured in 1.8-TeV {ital {bar p}p} collisions at the Fermilab Tevatron with the Collider Detector at Fermilab. In a sample of approximately 32 300 jets with a mean transverse energy of 47 GeV obtained from an exposure of 21.1 nb{sup {minus}1}, a signal corresponding to 25.0{plus minus}7.5(stat){plus minus}2.0(syst) {ital D}{sup *{plus minus}}{r arrow}K{sup {minus plus}}{pi}{sup {plus minus}}{pi}{sup {plus minus}} events is seen above background. This corresponds to a ratio {ital N}({ital D}{sup *+}+D{sup *{minus}})/N(jet) =0.10{plus minus}0.03{plus minus}0.03 for {ital D}{sup *} mesons with fractional momentum {ital z} greater than 0.1.

Jet-fragmentation properties in p-barp collisions at sqrt s =1.8 TeV.

The charged-particle fractional momentum distribution within jets, {ital D}({ital z}), has been measured in dijet events from 1.8-TeV {ital {bar p}p} collisions in the Collider Detector at Fermilab. As expected from scale breaking in quantum chromodynamics, the fragmentation function {ital D}({ital z}) falls more steeply as dijet invariant mass increases from 60 to 200 GeV/{ital c}{sup 2}. The average fraction of the jet momentum carried by charged particles is 0.65{plus minus}0.02(stat){plus minus}0.08(syst).

Jet-fragmentation properties in p p collisions at radical s =1. 8 TeV

The charged-particle fractional momentum distribution within jets, {ital D}({ital z}), has been measured in dijet events from 1.8-TeV {ital {bar p}p} collisions in the Collider Detector at Fermilab. As expected from scale breaking in quantum chromodynamics, the fragmentation function {ital D}({ital z}) falls more steeply as dijet invariant mass increases from 60 to 200 GeV/{ital c}{sup 2}. The average fraction of the jet momentum carried by charged particles is 0.65{plus minus}0.02(stat){plus minus}0.08(syst).

Two-jet invariant 0 mass distribution at √s=1.8 TeV

We present the dijet invariant-mass distribution in the region between 60 and 500 GeV, measured in 1.8-TeV {ital {bar p}p} collisions in the Collider Detector at Fermilab. Jets are restricted to the pseudorapidity interval {vert bar}{eta}{vert bar}{lt}0.7. Data are compared with QCD calculations; axigluons are excluded with 95% confidence in the region 120{lt}{ital M}{sub {ital A}}{lt}210 GeV for axigluon width {Gamma}{sub {ital A}}={ital N}{alpha}{sub s}{ital M}{sub {ital A}}/6, with {ital N}=5.

Two-jet invariant-mass distribution at radical s =1. 8 TeV

We present the dijet invariant-mass distribution in the region between 60 and 500 GeV, measured in 1.8-TeV {ital {bar p}p} collisions in the Collider Detector at Fermilab. Jets are restricted to the pseudorapidity interval {vert bar}{eta}{vert bar}{lt}0.7. Data are compared with QCD calculations; axigluons are excluded with 95% confidence in the region 120{lt}{ital M}{sub {ital A}}{lt}210 GeV for axigluon width {Gamma}{sub {ital A}}={ital N}{alpha}{sub s}{ital M}{sub {ital A}}/6, with {ital N}=5.

Dijet angular distributions from p-barp collisions at sqrt s=1.8 TeV.

We have measured dijet angular distributions at ..sqrt../ital s/ =1.8 TeV with the Collider Detector at Fermilab and the Tevatron /ital p/bar /p/ Collider and find agreement with leading-order QCD. By comparing the distribution for the highest dijet invariant masses with the prediction of a model of quark compositeness, we set a lower limit on the associated scale parameter ..lambda../sub /ital c// at 330 GeV (95% C.L.).