Showing papers by "Brad Abbott published in 2006"
15 Sep 2006-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The D0 experiment enjoyed a very successful data-collection run at the Fermilab Tevatron collider between 1992 and 1996 as discussed by the authors, and the detector has been upgraded to take advantage of improvements to the Tevoton and to enhance its physics capabilities.
Abstract: The D0 experiment enjoyed a very successful data-collection run at the Fermilab Tevatron collider between 1992 and 1996. Since then, the detector has been upgraded to take advantage of improvements to the Tevatron and to enhance its physics capabilities. We describe the new elements of the detector, including the silicon microstrip tracker, central fiber tracker, solenoidal magnet, preshower detectors, forward muon detector, and forward proton detector. The uranium/liquid-argon calorimeters and central muon detector, remaining from Run I, are discussed briefly. We also present the associated electronics, triggering, and data acquisition systems, along with the design and implementation of software specific to D0.
425 citations
TL;DR: The first direct two-sided bound on the oscillation frequency was reported in this article, where a large sample of semileptonic decays corresponding to approximately 1 fb$^{-1}$ of integrated luminosity collected by the \dzer\ experiment in 2002--2006 during Run II of the Fermilab Tevatron Collider was used.
Abstract: We report the first direct two-sided bound on the $B^0_s$ oscillation frequency using a large sample of $B^0_s$ semileptonic decays corresponding to approximately 1 fb$^{-1}$ of integrated luminosity collected by the \dzer\ experiment in 2002--2006 during Run II of the Fermilab Tevatron Collider. The flavor (i.e., $B^0_s$ or $\bar{B}^0_s$) of the \bs meson at the time of production was found using an opposite-side tagging technique, and the flavor at the time of decay was determined from the charge of the muon in the partially reconstructed decay $\bs\to \mu^{+}D_{s}^{-}X$, $D_{s}^{-}\to \phi \pi^{-}$, $\phi\to K^{+}K^{-}$. A likelihood scan over the oscillation frequency, $\Delta m_s$, gives a most probable value of 19 ps$^{-1}$ and a range of $17 < \Delta m_s < 21$ ps$^{-1}$ at the 90% C.L. At $\Delta m_s=19$ ps$^{-1}$, the amplitude method yields a result that deviates from the hypothesis of an oscillation amplitude of zero by 2.5 standard deviations, corresponding to a two-sided C.L. of 1%.
167 citations
TL;DR: In this article, the authors measured the cross section for the inclusion of isolated photons in p anti-p collisions at 1.96 TeV with the D0 detector at the Fermilab Tevatron Collider.
70 citations
TL;DR: In this paper, a measurement of the top quark mass with the Matrix Element method in the lepton+jets final state is presented, where the matrix element likelihood is extended by an additional parameter, defined as a global multiplicative factor applied to the standard energy scale.
Abstract: We present a measurement of the top quark mass with the Matrix Element method in the lepton+jets final state. As the energy scale for calorimeter jets represents the dominant source of systematic uncertainty, the Matrix Element likelihood is extended by an additional parameter, which is defined as a global multiplicative factor applied to the standard energy scale. The top quark mass is obtained from a fit that yields the combined statistical and systematic jet energy scale uncertainty.
60 citations
TL;DR: The results of a search for squarks and gluinos using data from p p ¯ collisions recorded at a center-of-mass energy of 1.96 TeV by the DO detector at the Fermilab Tevatron Collider are reported in this article.
44 citations
TL;DR: In this paper, the authors reported a new measurement of the t{bar t} production cross section in p{bar p} collisions at a center-of-mass energy of 1.96 TeV using events with one charged lepton (electron or muon), missing transverse energy, and jets.
Abstract: We report a new measurement of the t{bar t} production cross section in p{bar p} collisions at a center-of-mass energy of 1.96 TeV using events with one charged lepton (electron or muon), missing transverse energy, and jets. Using 425 pb{sup -1} of data collected using the D0 detector at the Fermilab Tevatron Collider, and enhancing the t{bar t} content of the sample by tagging b jets with a secondary vertex tagging algorithm, the t{bar t} production cross section is measured to be: {sigma}{sub p{bar p} {yields} t{bar t}+X} = 6.6 {+-} 0.9(stat + syst) {+-} 0.4(lum) pb. This cross section is the most precise D0 measurement to date for t{bar t} production and is in good agreement with standard model expectations.
39 citations
TL;DR: In this article, a measurement of the mixing frequency and the calibration of an opposite-side flavor tagger in the D{\O}experiment were reported, and the overall effective tagging power was found to be eD^2 = (2.48 \pm 0.21 (stat.) ^{+0.08}-0.06} (syst.))%.
Abstract: We report on a measurement of the $B^0_d$ mixing frequency and the calibration of an opposite-side flavor tagger in the D{\O}experiment. Various properties associated with the $b$ quark on the opposite side of the reconstructed $B$ meson were combined using a likelihood-ratio method into a single variable with enhanced tagging power. Its performance was tested with data, using a large sample of reconstructed semileptonic $B \to \mu \dzero X$ and $B \to \mu \dst X$ decays, corresponding to an integrated luminosity of approximately 1 fb$^{-1}$. The events were divided into groups depending on the value of the combined tagging variable, and an independent analysis was performed in each group. Combining the results of these analyses, the overall effective tagging power was found to be eD^2 = (2.48 \pm 0.21 (stat.) ^{+0.08}_{-0.06} (syst.))%. The measured $B^0_d$ mixing frequency dmd = 0.506 \pm 0.020 {\rm (stat) \pm 0.016 (syst) ps}^{-1} is in good agreement with the world average value.
39 citations
TL;DR: In this paper, the authors measured the tt[over] production cross section in pp[over]-collision at sqrt(s) = 1.96 TeV in the lepton + jets channel.
Abstract: We measure the tt[over] production cross section in pp[over] collisions at sqrt(s)=1.96 TeV in the lepton + jets channel. Two complementary methods discriminate between signal and background: b tagging and a kinematic likelihood discriminant. Based on 0.9 fb(-1) of data collected by the D0 detector at the Fermilab Tevatron Collider, we measure sigma(tt[over])=7.62+/-0.85 pb, assuming the current world average m(t)=172.6 GeV. We compare our cross section measurement with theory predictions to determine a value for the top-quark mass of 170+/-7 GeV.
38 citations
TL;DR: In this article, the authors measured the dimuon charge asymmetry A in p (p) over bar collisions at a center of mass energy root s=1960 GeV.
Abstract: We measure the dimuon charge asymmetry A in p (p) over bar collisions at a center of mass energy root s=1960 GeV. The data was recorded with the D0 detector and corresponds to an integrated luminosity of approximately 1.0 fb(-1). Assuming that the asymmetry A is due to asymmetric B-0 (B) over bar (0) mixing and decay, we extract the CP-violation parameter of B-0 mixing and decay: ((epsilon B0))/(1+vertical bar epsilon B0 vertical bar 2)=(AB0)/(4)= -0.0023 +/- 0.0011(stat)+/- 0.0008(syst).A(B)(0) is the dimuon charge asymmetry from decays of B-0(B) over bar (0) pairs. The general case, with CP violation in both B-0 and B-s(0) systems, is also considered. Finally we obtain the forward-backward asymmetry that quantifies the tendency of mu(+) to go in the proton direction and mu(-) to go in the antiproton direction. The results are consistent with the standard model and constrain new physics.
37 citations
TL;DR: In this paper, a search for direct production of scalar bottom quarks ((b) over bar) is performed with 310 pb(-1) of data collected by the D0 experiment in p (p)over bar collisions at root s = 1.96 TeV at the Fermilab Tevatron Collider.
Abstract: A search for direct production of scalar bottom quarks ((b) over bar) is performed with 310 pb(-1) of data collected by the D0 experiment in p (p) over bar collisions at root s = 1.96 TeV at the Fermilab Tevatron Collider. The topology analyzed consists of two b jets and an imbalance in transverse momentum due to undetected neutralinos (chi(0)(1)), with chi(0)(1) assumed to be the lightest supersymmetric particle. We find the data consistent with standard model expectations, and set a 95% C.L. exclusion domain in the (m(b), m(chi 1)(0)) mass plane, improving significantly upon the results from run I of the Tevatron.
29 citations
TL;DR: In this paper, a search for the production of neutral Higgs bosons decaying into {tau}{sup +}{tau} final states in p{bar p} collisions at a center-of-mass energy of 1.96 TeV is presented.
Abstract: A search for the production of neutral Higgs bosons {Phi} decaying into {tau}{sup +}{tau}{sup -} final states in p{bar p} collisions at a center-of-mass energy of 1.96 TeV is presented. The data, corresponding to an integrated luminosity of approximately 325 pb{sup -1}, were collected by the D0 experiment at the Fermilab Tevatron Collider. Since no excess compared to the expectation from standard model processes is found, limits on the production cross section times branching ratio are set. The results are combined with those obtained from the D0 search for {Phi}b({bar b}) {yields} b{bar b}b({bar b}) and are interpreted in the minimal supersymmetric standard model.
TL;DR: In this paper, the authors present a search for a neutral particle, pair-produced in p-pbar collisions at sqrt(s)=1.96 TeV, which decays into two muons and lives long enough to travel at least 5 cm before decaying.
Abstract: We present a search for a neutral particle, pair-produced in p-pbar collisions at sqrt(s)=1.96 TeV, which decays into two muons and lives long enough to travel at least 5 cm before decaying. The analysis uses ~380 pb^-1 of data recorded with the D0 detector. The background is estimated to be about one event. No candidates are observed, and limits are set on the pair production cross section times branching fraction into dimuons + X for such particles. For a mass of 10 GeV and lifetime of 4x10^-11 s, we exclude values greater than 0.14 pb (95% C.L.). These results are used to limit the interpretation of NuTeV's excess of di-muon events.
TL;DR: In this paper, the authors reported a measurement of the B-s(0) lifetime in the semileptonic decay channel using approximately 0.4 fb(-1) of data collected with the D0 detector during 2002-2004.
Abstract: We report a measurement of the B-s(0) lifetime in the semileptonic decay channel B-s(0)-> D-s(-)mu(+)nu X (and its charge conjugate), using approximately 0.4 fb(-1) of data collected with the D0 detector during 2002-2004. Using 5176 reconstructed D-s(-)mu(+) signal events, we have measured the B-s(0) lifetime to be tau(B-s(0))=1.398 +/- 0.044(stat)(-0.025)(+0.028)(syst) ps. This is the most precise measurement of the B-s(0) lifetime to date.
TL;DR: In this paper, the authors presented a search for a new heavy gauge boson W' that decays to a top quark and a bottom quark, and set upper limits on the production cross section of W' bosons times branching ratio to top quarks at the 95% confidence level for several different W, boson masses.
01 Jan 2006
TL;DR: In this article, the authors present a survey of the state-of-the-art work in this area, including the following: A. C. Ahn, M. A. Desai, H. H. Atramentov, C. Avila, A. M. Agelou, S. S. Anzelc, Y. Ahsan, G. Anastasoaie, T. Anneal, M A. Abazov, B. Abolins, M S. Abdoghaddam, M E.
Abstract: V. M. Abazov, B. Abbott, M. Abolins, B. S. Acharya, M. Adams, T. Adams, M. Agelou, S. H. Ahn, M. Ahsan, G. D. Alexeev, G. Alkhazov, A. Alton, G. Alverson, G. A. Alves, M. Anastasoaie, T. Andeen, S. Anderson, B. Andrieu, M. S. Anzelc, Y. Arnoud, M. Arov, A. Askew, B. Asman, A. C. S. Assis Jesus, O. Atramentov, C. Autermann, C. Avila, C. Ay, F. Badaud, A. Baden, L. Bagby, B. Baldin, D. V. Bandurin, P. Banerjee, S. Banerjee, E. Barberis, P. Bargassa, P. Baringer, C. Barnes, J. Barreto, J. F. Bartlett, U. Bassler, D. Bauer, A. Bean, M. Begalli, M. Begel, C. Belanger-Champagne, L. Bellantoni, A. Bellavance, J. A. Benitez, S. B. Beri, G. Bernardi, R. Bernhard, L. Berntzon, I. Bertram, M. Besancon, R. Beuselinck, V. A. Bezzubov, P. C. Bhat, V. Bhatnagar, M. Binder, C. Biscarat, K. M. Black, I. Blackler, G. Blazey, F. Blekman, S. Blessing, D. Bloch, K. Bloom, U. Blumenschein, A. Boehnlein, O. Boeriu, T. A. Bolton, G. Borissov, K. Bos, T. Bose, A. Brandt, R. Brock, G. Brooijmans, A. Bross, D. Brown, N. J. Buchanan, D. Buchholz, M. Buehler, V. Buescher, S. Burdin, S. Burke, T. H. Burnett, E. Busato, C. P. Buszello, J. M. Butler, P. Calfayan, S. Calvet, J. Cammin, S. Caron, W. Carvalho, B. C. K. Casey, N. M. Cason, H. Castilla-Valdez, D. Chakraborty, K. M. Chan, A. Chandra, F. Charles, E. Cheu, F. Chevallier, D. K. Cho, S. Choi, B. Choudhary, L. Christofek, D. Claes, B. Clement, C. Clement, Y. Coadou, M. Cooke, W. E. Cooper, D. Coppage, M. Corcoran, M.-C. Cousinou, B. Cox, S. Crepe-Renaudin, D. Cutts, M. Cwiok, H. da Motta, A. Das, M. Das, B. Davies, G. Davies, G. A. Davis, K. De, P. de Jong, S. J. de Jong, E. De La Cruz-Burelo, C. De Oliveira Martins, J. D. Degenhardt, F. Deliot, M. Demarteau, R. Demina, P. Demine, D. Denisov, S. P. Denisov, S. Desai, H. T. Diehl, M. Diesburg, M. Doidge, A. Dominguez, H. Dong, L. V. Dudko, L. Duflot, S. R. Dugad, D. Duggan, A. Duperrin, J. Dyer, A. Dyshkant, M. Eads, D. Edmunds, T. Edwards, J. Ellison, J. Elmsheuser, V. D. Elvira, S. Eno, P. Ermolov, H. Evans, A. Evdokimov, V. N. Evdokimov, S. N. Fatakia, L. Feligioni, A. V. Ferapontov, T. Ferbel, F. Fiedler, F. Filthaut, W. Fisher, H. E. Fisk, I. Fleck, M. Ford, M. Fortner, H. Fox, S. Fu, S. Fuess, T. Gadfort, C. F. Galea, E. Gallas, E. Galyaev, C. Garcia, A. Garcia-Bellido, J. Gardner, V. Gavrilov, A. Gay, P. Gay, D. Gele, R. Gelhaus, C. E. Gerber, Y. Gershtein, D. Gillberg, G. Ginther, N. Gollub, B. Gomez, A. Goussiou, P. D. Grannis, H. Greenlee, Z. D. Greenwood, E. M. Gregores, G. Grenier, Ph. Gris, J.-F. Grivaz, S. Grunendahl, M. W. Grunewald, F. Guo, J. Guo, G. Gutierrez, P. Gutierrez, A. Haas, N. J. Hadley, P. Haefner, S. Hagopian, J. Haley, I. Hall, R. E. Hall, L. Han, K. Hanagaki, K. Harder, A. Harel, R. Harrington, J. M. Hauptman, R. Hauser, J. Hays, T. Hebbeker, D. Hedin, J. G. Hegeman, J. M. Heinmiller, A. P. Heinson, U. Heintz, C. Hensel, K. Herner, G. Hesketh, M. D. Hildreth, R. Hirosky, J. D. Hobbs, B. Hoeneisen, H. Hoeth, M. Hohlfeld, S. J. Hong, R. Hooper, P. Houben, Y. Hu, Z. Hubacek, V. Hynek, I. Iashvili, R. Illingworth, A. S. Ito, S. Jabeen, M. Jaffre, S. Jain, K. Jakobs, C. Jarvis, A. Jenkins, R. Jesik, K. Johns, C. Johnson, M. Johnson, A. Jonckheere, P. Jonsson, A. Juste, D. Kafer, S. Kahn, E. Kajfasz, A. M. Kalinin, J. M. Kalk, J. R. Kalk, S. Kappler, D. Karmanov, J. Kasper, P. Kasper, I. Katsanos, D. Kau, R. Kaur, R. Kehoe, S. Kermiche, N. Khalatyan, A. Khanov, A. Kharchilava, Y. M. Kharzheev, D. Khatidze, H. Kim, T. J. Kim, M. H. Kirby, B. Klima, J. M. Kohli, J.-P. Konrath, M. Kopal, V. M. Korablev, J. Kotcher, B. Kothari, A. Koubarovsky, A. V. Kozelov, J. Kozminski, D. Krop, A. Kryemadhi, T. Kuhl, A. Kumar, S. Kunori, A. Kupco, T. Kurca,* J. Kvita, S. Lammers, G. Landsberg, J. Lazoflores, A.-C. Le Bihan, P. Lebrun, W. M. Lee, A. Leflat, F. Lehner, V. Lesne, J. Leveque, P. Lewis, J. Li, Q. Z. Li, J. G. R. Lima, D. Lincoln, J. Linnemann, V. V. Lipaev, R. Lipton, Z. Liu, L. Lobo, A. Lobodenko, M. Lokajicek, A. Lounis, P. Love, H. J. Lubatti, M. Lynker, A. L. Lyon, A. K. A. Maciel, R. J. Madaras, P. Mattig, C. Magass, A. Magerkurth, A.-M. Magnan, N. Makovec, P. K. Mal, H. B. Malbouisson, S. Malik, V. L. Malyshev, H. S. Mao, Y. Maravin, M. Martens, R. McCarthy, D. Meder, A. Melnitchouk, A. Mendes, L. Mendoza, M. Merkin, K. W. Merritt, A. Meyer, J. Meyer, M. Michaut, H. Miettinen, T. Millet, J. Mitrevski, J. Molina, N. K. Mondal, J. Monk, R. W. Moore, T. Moulik, G. S. Muanza, M. Mulders, M. Mulhearn, L. Mundim, Y. D. Mutaf, E. Nagy, M. Naimuddin, M. Narain, N. A. Naumann, H. A. Neal, J. P. Negret, P. Neustroev, C. Noeding, A. Nomerotski, S. F. Novaes, T. Nunnemann, V. O’Dell, D. C. O’Neil, G. Obrant, V. Oguri, N. Oliveira, N. Oshima, R. Otec, PRL 97, 161802 (2006) P H Y S I C A L R E V I E W L E T T E R S week ending 20 OCTOBER 2006
TL;DR: In this paper, a search for the pair production of second generation scalar leptoquarks (LQ_2) in ppbar collisions at the center-of-mass energy sqrt(s) = 1.96 TeV, using data corresponding to an integrated luminosity of 294 +- 19 pb^-1 recorded with the D0 detector was conducted.
TL;DR: A search for leptoquarks was performed in 310 pb{sup -1} of data from p{bar p} collisions at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron Collider as discussed by the authors.
TL;DR: In this paper, a search for gaugino pair production with a trilepton signature in the framework of R-parity violating supersymmetry via couplings lambda_121, lambda_122, or lambda_133 is presented.
TL;DR: In this paper, a measurement of the Lambda(0)(b) lifetime using a sample corresponding to 1.3 fb(-1) of data collected by the D0 experiment in 2002-2006 during run II of the Fermilab Tevatron collider was reported.
Abstract: We report a measurement of the Lambda(0)(b) lifetime using a sample corresponding to 1.3 fb(-1) of data collected by the D0 experiment in 2002-2006 during run II of the Fermilab Tevatron collider. ...
TL;DR: In this article, the authors present the results of a search for the production of an excited state of the muon, mu*, in proton antiproton collisions at root s = 1.96 TeV.
Abstract: We present the results of a search for the production of an excited state of the muon, mu(*), in proton antiproton collisions at root s =1.96 TeV. The data have been collected with the D0 experiment at the Fermilab Tevatron Collider and correspond to an integrated luminosity of approximately 380 pb(-1). We search for mu(*) in the process p (p) over bar ->mu(*)mu, with the mu(*) subsequently decaying to a muon plus photon. No excess above the standard model expectation is observed in data. Interpreting our data in the context of a model that describes mu(*) production by four-fermion contact interactions and mu(*) decay via electroweak processes, we set a 95% confidence level production cross section upper limit ranging from 0.057 to 0.112 pb, depending on the mass of the excited muon. Choosing the scale for contact interactions to be Lambda=1 TeV, excited muon masses below 618 GeV are excluded.
TL;DR: In this article, the authors search for a heavy resonance decaying into a Z+jet final state in p (p) over bar collisions at a center of mass energy of 1.96 TeV at the Fermilab Tevatron collider using the D0 detector.
Abstract: We have searched for a heavy resonance decaying into a Z+jet final state in p (p) over bar collisions at a center of mass energy of 1.96 TeV at the Fermilab Tevatron collider using the D0 detector. No indication for such a resonance was found in a data sample corresponding to an integrated luminosity of 370 pb(-1). We set upper limits on the cross section times branching fraction for heavy resonance production at the 95% C.L. as a function of the resonance mass and width. The limits are interpreted within the framework of a specific model of excited quark production.
TL;DR: In the framework of minimal supergravity, limits on the coupling parameter lambda(211)('), are set, extending significantly previous results obtained in Run I of the Tevatron and at the CERN LEP collider.
Abstract: We present a search for supersymmetry in the R-parity violating resonant production and decay of smuons and muon sneutrinos in the channels mu ->chi(0)(1)mu, mu ->chi(0)(2,3,4)mu, and nu(mu)->chi(+/-)(1,2)mu. We analyzed 0.38 fb(-1) of integrated luminosity collected between April 2002 and August 2004 with the D0 detector at the Fermilab Tevatron Collider. The observed number of events is in agreement with the standard model expectation, and we calculate 95% C.L. limits on the slepton production cross section times branching fraction to gaugino plus muon, as a function of slepton and gaugino masses. In the framework of minimal supergravity, we set limits on the coupling parameter lambda(')(211), extending significantly previous results obtained in Run I of the Tevatron and at the CERN LEP collider.
TL;DR: In this article, the authors measured R = 1.03(-0.17) (stat + syst), in good agreement with the standard model, and set lower limits of R > 0.61 and vertical bar V-tb vertical bar < 0.78 at 95% confidence level.
TL;DR: In this article, a search for the standard model Higgs boson in H --> WW(*) decays with e+e-, e+/-mu-/+, and mu+mu- final states in pp collisions at a center-of-mass energy of square root of s = 1.96 TeV.
Abstract: We present a search for the standard model Higgs boson in H --> WW(*) decays with e+e-, e+/-mu-/+, and mu+mu- final states in pp collisions at a center-of-mass energy of square root of s = 1.96 TeV. The data, collected from April 2002 to June 2004 with the D0 detector, correspond to an integrated luminosity of 300-325 pb(-1), depending on the final state. The number of events observed is consistent with the expectation from backgrounds. Limits from the combination of all three channels on the Higgs boson production cross section times branching ratio sigma x BR(H --> WW(*) are presented.
TL;DR: In this paper, a search for associated Higgs boson production in the process of final states containing two like-sign isolated electrons or muons was presented, based on D0 Run II data samples corresponding to integrated luminosities of 360--380 pb$-1.
Abstract: We present a search for associated Higgs boson production in the process $p\bar{p} \to WH\to WWW^*\to l^\pm
u l'^\pm
u'+X$ in final states containing two like-sign isolated electrons or muons ($e^\pm e^\pm$, $e^\pm \mu^\pm$, or $\mu^\pm \mu^\pm$). The search is based on D0 Run II data samples corresponding to integrated luminosities of 360--380 pb$^{-1}$. No excess is observed over the predicted standard model background. We set 95% C.L. upper limits on $\sigma(p\bar{p}\to WH)\times Br(H\to WW^*)$ between 3.2 and 2.8 pb for Higgs masses from 115 to 175 GeV.
TL;DR: In this article, the standard model Higgs boson was found to have an integrated luminosity of 260 pb^-1.3 pb in the D0 experiment at the Fermilab Tevatron Collider.
Abstract: We report a search for the standard model (SM) Higgs boson based on data collected by the D0 experiment at the Fermilab Tevatron Collider, corresponding to an integrated luminosity of 260 pb^-1. We study events with missing transverse energy and two acoplanar b-jets, which provide sensitivity to the ZH production cross section in the neutrino-neutrino-b-b channel and to WH production, when the lepton from the W -> lepton+neutrino decay is undetected. The data are consistent with the SM background expectation, and we set 95% C.L. upper limits on sigma(p p-bar -> ZH/WH) x B(H -> b b-bar) from 3.4/8.3 to 2.5/6.3 pb, for Higgs masses between 105 and 135 GeV.
TL;DR: In this paper, the anomalous WW gamma and WWZ trilinear gauge couplings using W+W--> e(+)nu(e)e(-)(nu) over bar (e) events were set.
Abstract: Limits are set on anomalous WW gamma and WWZ trilinear gauge couplings using W+W--> e(+)nu(e)e(-)(nu) over bar (e), W+W--> e(+/-)nu(e)mu(-/+)nu(mu), and W+W-->mu(+)nu(mu)mu(-)(nu) over bar (mu) events. The data set was collected by the Run II D0 detector at the Fermilab Tevatron Collider and corresponds to approximately 250 pb(-1) of integrated luminosity at root s=1.96 TeV. Under the assumption that the WW gamma couplings are equal to the WWZ couplings and using a form factor scale of Lambda=2.0 TeV, the combined 95% C.L. one-dimensional coupling limits from all three channels are -0.32
TL;DR: In this article, an upper bound on the branching ratio of the neutral current decay B-s(0)->phi mu(+)mu(+) = 4.1x10(-6) at the 95% C.L.
Abstract: We present a search for the flavor-changing neutral current decay B-s(0)->phi mu(+)mu(-) using about 0.45 fb(-1) of data collected in p (p) over bar collisions at root s=1.96 TeV with the D0 detector at the Fermilab Tevatron Collider. We find an upper limit on the branching ratio of this decay normalized to B-s(0)-> J/psi phi of B(B-s(0)->phi mu(+)mu(-))/B(B-s(0)-> J/psi phi) J/psi phi, the limit corresponds to B(B-s(0)->phi mu(+)mu(-))< 4.1x10(-6) at the 95% C.L., the most stringent upper bound to date.
TL;DR: The first search for a new particle X produced in p{bar p} collisions at {radical}s = 1.96 TeV and subsequently decaying to Z{gamma] was performed in this paper.