We present a detailed description of a search for anomalous production of missing ET (6ET), jets, leptons (e; ; ), b-quarks, or additional photons in events containing two isolated, central (j j < 1:0) photons with ET > 12 GeV. The results are consistent with standard model expectations, with the possible exception of one event that has in addition to the two photons a central electron, a high-ET electromagnetic cluster, and large 6ET. We set limits using two speci c SUSY scenarios for production of diphoton events with 6ET. PACS numbers 13.85Rm, 12.60.Jv, 13.85.Qk, 14.80.Ly 4

We measure the relative rate of production of orbitally excited (L=1) states of B mesons (B**) by observing their decays into Bπ±. We reconstruct B mesons through semileptonic decay channels using data collected in p¯p collisions at √s=1.8TeV. The fraction of light B mesons that are produced as L=1B** states is measured to be 0.28±0.06(stat)±0.03(syst). We also measure the collective mass of the B** states, and quantify the result by quoting the (model-dependent) mass of the lowest B** state to be m(B1)=5.71±0.02GeV/c2. Received 3 November 1999DOI:https://doi.org/10.1103/PhysRevD.64.072002©2001 American Physical Society

We measure the relative rate of production of orbitally excited (L = 1) states of B mesons (B**) by observing their decays into B pi (+/-). We reconstruct B mesons through semileptonic decay channels using data collected in p(p) over bar collisions at roots = 1.8 TeV. The fraction of light B mesons that are produced as L = 1B** states is measured to be 0.28 +/- 0.06(stat) +/- 0.03(syst). We also measure the collective mass of the B** states, and quantify the result by quoting the (model-dependent) mass of the lowest B** state to be m(B-1) = 5.71 +/- 0.02 GeV/c(2).

We present the results of a search for pair production of a fourth-generation charge $\ensuremath{-}\frac{1}{3}$ quark $({b}^{\ensuremath{'}})$ in $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ $p\overline{p}$ collisions using $88{\mathrm{pb}}^{\ensuremath{-}1}$ of data obtained with the Collider Detector at Fermilab. We assume that both quarks decay via the flavor-changing neutral current process ${b}^{\ensuremath{'}}\ensuremath{\rightarrow}{\mathrm{bZ}}^{0}$ and that the ${b}^{\ensuremath{'}}$ mass is greater than ${m}_{Z}{+m}_{b}$. We studied the decay mode ${b}^{\ensuremath{'}}\overline{{b}^{\ensuremath{'}}}\ensuremath{\rightarrow}{Z}^{0}{Z}^{0}b\overline{b}$ where one ${Z}^{0}$ decays into ${e}^{+}{e}^{\ensuremath{-}}$ or ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and the other decays hadronically, giving a signature of two leptons plus jets. An upper limit on the ${\ensuremath{\sigma}}_{p\overline{p}\ensuremath{\rightarrow}{b}^{\ensuremath{'}}\overline{{b}^{\ensuremath{'}}}}\ifmmode\times\else\texttimes\fi{}[B({b}^{\ensuremath{'}}\ensuremath{\rightarrow}{\mathrm{bZ}}^{0}){]}^{2}$ is established as a function of the ${b}^{\ensuremath{'}}$ mass. We exclude at $95%$ confidence level a ${b}^{\ensuremath{'}}$ quark with mass between 100 and $199\mathrm{GeV}{/c}^{2}$ for $B({b}^{\ensuremath{'}}\ensuremath{\rightarrow}{\mathrm{bZ}}^{0})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}100%$.

We have studied the production of B hadrons in 1.8-TeV p&pmacr; collisions. We present measurements of the fragmentation fractions, f(u), f(d), f(s), and f(baryon), of produced b quarks that yield B+, B0, B(0)(s), and Lambda;(0)(b) hadrons. Reconstruction of five electron-charm final states yields f(s)/( f(u)+f(d)) = 0.213+/-0.068 and f(baryon)/( f(u)+f(d)) = 0.118+/-0.042, assuming f(u) = f(d). If all B hadrons produced in p&pmacr; collisions cascade to one of these four hadrons, we determine f(u) = f(d) = 0.375+/-0.023, f(s) = 0.160+/-0.044, and f(baryon) = 0.090+/-0.029. If we do not assume f(u) = f(d), we find f(d)/f(u) = 0.84+/-0.16.

We have studied the production of B hadrons in 1.8-TeV pp[over ¯] collisions. We present measurements of the fragmentation fractions, f_{u}, f_{d}, f_{s}, and f_{baryon}, of produced b quarks that yield B^{+}, B^{0}, B_{s}^{0}, and Λ[over ¯]_{b}^{0} hadrons. Reconstruction of five electron-charm final states yields f_{s}/( f_{u}+f_{d})=0.213±0.068 and f_{baryon}/( f_{u}+f_{d})=0.118±0.042, assuming f_{u}=f_{d}. If all B hadrons produced in pp[over ¯] collisions cascade to one of these four hadrons, we determine f_{u}=f_{d}=0.375±0.023, f_{s}=0.160±0.044, and f_{baryon}=0.090±0.029. If we do not assume f_{u}=f_{d}, we find f_{d}/f_{u}=0.84±0.16.

We search for color singlet technirho and technipion production in pp collisions at sqrt[s] = 1.8 TeV recorded with the Collider Detector at Fermilab. These exotic technimesons are present in a model of walking technicolor. The signatures studied are lepton plus two jets plus E(T) and multijet final states. No excess of events is seen in either final state. We set an upper limit on the technirho production cross section and exclude a region in the technipion mass versus technirho mass plane.

We have searched for direct pair production of scalar top and scalar bottom quarks in 88 pb-1 of pp collisions at sqrt[s]=1.8 TeV with the CDF detector. We looked for events with a pair of heavy flavor jets and missing energy, consistent with scalar top (bottom) quark decays to a charm (bottom) quark and a neutralino. The numbers of events that pass our selections show no significant deviation from standard model expectations. We compare our results to the next-to-leading order scalar quark production cross sections to exclude regions in scalar quark-neutralino mass parameter space.

We have reconstructed the radiative decays chi(b)(1P) --> Y(1S)gamma and chi(b)(2P) --> Y(1S)gamma in (p) over bar p collisions at root s = 1.8 TeV, and measured the fraction of Y(1S) mesons that originate-from these decays. For Y(1S) mesons with p(T)(Y) > 8.0 GeV/c, the fractions that come from chi(b)(1P) and chi(b)(2P) decays are [27.1 +/- 619(stat) +/- 4.4(syst)]% and [10.5 +/- 4.4(stat) +/- 1.4(syst)]%, respectively. We have derived the fraction of directly produced Y(1S) mesons to be [50.9 +/- 8.2(stat) +/- 9.0(syst)]%.

We report the results of a search for a W' boson produced in pp collisions at a center-of-mass energy of 1.8 TeV using a 107 pb-1 data sample recorded by the Collider Detector at Fermilab. We consider the decay channel W'-->&munumu and search for anomalous production of high transverse mass munumu lepton pairs. We observe no excess of events above background and set limits on the rate of W' boson production and decay relative to standard model W boson production and decay using a fit of the transverse mass distribution observed. If we assume standard model strength couplings of the W' boson to quark and lepton pairs, we exclude a W' boson with invariant mass less than 660 GeV/c2 at 95% confidence level.

We present a measurement of the mass difference Delta m(d) of the two B-d(0) mass eigenstates. We use a flavor tagging method based on the lepton charge, in a sample of events with two muons at low transverse momentum. The sample corresponds to an integrated luminosity of 90 pb(-1) collected by the Collider Detector at Fermilab. The result obtained is Delta m(d)=0.503+/-0.064(stat)+/-0.071(syst) ps(-1). [S0556-2821(99)50215-4].

We have used 87 pb(-1) of data collected with the collider detector at Fermilab to search for new particles decaying to b (b) over bar. We present model-independent upper limits on the cross section for narrow resonances which exclude the color-octet technirho in the mass interval 350 < M < 440 GeV/c(2). In addition, we exclude top-gluons, predicted in models of top-color-assisted technicolor, of width Gamma = 0.3M in the mass range 280 < M < 670 GeV/c(2), of width Gamma = 0.5M in the mass range 340 < M < 640 GeV/c(2), and of width Gamma = 0.7M in the mass range 375 < M < 560 GeV/c(2).