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Search for pair production of first-generation leptoquarks in pp¯ collisions at s=1.96 TeV
Abazov, V.M.,Abbott, B.,Abolins, M.,Acharya, B.S.,Adams, M.,Adams, T.,Aguilo, E.,Ahsan, M.,Alexeev, G.D.,Alkhazov, G.,Alton, A.,Alverson, G.,Alves, G.A.,Ancu, L.S.,Andeen, T.,Anzelc, M.S.,Aoki, M.,Arn Elsevier 2009 Physics letters: B Vol.681 No.3
<P><B>Abstract</B></P><P>A search for pair production of first-generation leptoquarks (<I>LQ</I>) is performed with data collected by the DØ experiment in pp¯ collisions at s=1.96 TeV at the Fermilab Tevatron Collider. In a sample of data corresponding to ∼1<SUP> fb−1</SUP> the search has been performed on the final states with two electrons and two jets or one electron, two jets and missing transverse energy. We find our data consistent with standard model expectations. The results are combined with those found in a previous analysis of events with two jets and missing transverse energy to obtain scalar <I>LQ</I> mass limits. We set 95% C.L. lower limits on a scalar <I>LQ</I> mass of 299 GeV, 284 GeV and 216 GeV for β=1, β=0.5 and β=0.02 respectively, where <I>β</I> is the <I>LQ</I> branching ratio in the <I>eq</I> channel. This improves the results obtained with a lower luminosity sample from Run II of the Tevatron. Lower limits on vector <I>LQ</I> masses with different couplings from 357 GeV to 464 GeV for β=0.5 are also set using this analysis.</P>
Search for AssociatedWand Higgs Boson Production inpp¯Collisions ats=1.96 TeV
Abazov, V. M.,Abbott, B.,Abolins, M.,Acharya, B. S.,Adams, M.,Adams, T.,Aguilo, E.,Ahsan, M.,Alexeev, G. D.,Alkhazov, G.,Alton, A.,Alverson, G.,Alves, G. A.,Anastasoaie, M.,Ancu, L. S.,Andeen, T.,Andr American Physical Society 2009 Physical Review Letters Vol.102 No.5
<P>We present results of a search for WH-->lnubb[over ] production in pp[over ] collisions based on the analysis of 1.05 fb;{-1} of data collected by the D0 experiment at the Fermilab Tevatron, using a neural network for separating the signal from backgrounds. No signal-like excess is observed, and we set 95% C.L. upper limits on the WH production cross section multiplied by the branching ratio for H-->bb[over ] for Higgs boson masses between 100 and 150 GeV. For a mass of 115 GeV, we obtain an observed (expected) limit of 1.5 (1.4) pb, a factor of 11.4 (10.7) times larger than the standard model prediction.</P>
Observation and studies of doubleJ/ψproduction at the Tevatron
Abazov, V. M.,Abbott, B.,Acharya, B. S.,Adams, M.,Adams, T.,Agnew, J. P.,Alexeev, G. D.,Alkhazov, G.,Alton, A.,Askew, A.,Atkins, S.,Augsten, K.,Avila, C.,Badaud, F.,Bagby, L.,Baldin, B.,Bandurin, D. V American Physical Society 2014 PHYSICAL REVIEW D - Vol.90 No.11
CENTRAL ASIAN PIPELINE DILEMMAS:SECURITY, POLITICS AND ECONOMY
ABAZOV,RAFIS GRADUATE INSTITUTE FOR INTERNATIONAL AND AREA STUD 1998 Journal of International and Area Studies Vol.5 No.1
This article assesses major oil and gas pipeline projects proposed to bring the natural resources from Central Asian republics (CARs) to the international market and focuses on various factors affecting realization of these projects. Also I examine the economic viability of the numerous transportation and pipeline projects. I argue that due to the landlocked location of the CARs and vulnerability of the oil and gas pipelines to various external and internal influences, the local policy makers and international corporations are searching for multiple routes from the region to the international market. In order to avoid dependence on a single international actor such as Russia or Iran, the CARs governments are attempting to involve new outside actors, including East Asian countries, into the regional affairs with whom they could co-operate in maintaining the security balance and stability. This paper examines three major issues that are especially important for policy makers in the Central Asian republics: (1) security issues in the post-Soviet CAR; (2) economic issues; (3) political and regional issues and their impact on the perspectives of the realization of these projects. The author argues that realization of these projects will affect security regimes in and around the regions that create dilemmas for the Central Asian policy makers considering realization of various projects.
Abazov, V. M.,Abbott, B.,Abolins, M.,Acharya, B. S.,Adams, M.,Adams, T.,Aguilo, E.,Ahsan, M.,Alexeev, G. D.,Alkhazov, G.,Alton, A.,Alverson, G.,Alves, G. A.,Ancu, L. S.,Andeen, T.,Anzelc, M. S.,Aoki, American Physical Society 2009 Physical Review Letters Vol.103 No.6
<P>We report on a first search for production of the lightest neutral CP-even Higgs boson (h) in the next-to-minimal supersymmetric standard model, where h decays to a pair of neutral pseudoscalar Higgs bosons (a), using 4.2 fb;{-1} of data recorded with the D0 detector at Fermilab. The a bosons are required to either both decay to micro;{+}micro;{-} or one to micro;{+}micro;{-} and the other to tau;{+}tau;{-}. No significant signal is observed, and we set limits on its production as functions of M_{a} and M_{h}.</P>
Search for charged Higgs bosons in decays of top quarks
Abazov, V. M.,Abbott, B.,Abolins, M.,Acharya, B. S.,Adams, M.,Adams, T.,Aguilo, E.,Ahsan, M.,Alexeev, G. D.,Alkhazov, G.,Alton, A.,Alverson, G.,Alves, G. A.,Ancu, L. S.,Andeen, T.,Anzelc, M. S.,Aoki, American Physical Society 2009 PHYSICAL REVIEW D - Vol.80 No.5
Search for Resonant Second Generation Slepton Production at the Fermilab Tevatron
Abazov, V. M.,Abbott, B.,Abolins, M.,Acharya, B. S.,Adams, M.,Adams, T.,Agelou, M.,Agram, J.-L.,Ahn, S. H.,Ahsan, M.,Alexeev, G. D.,Alkhazov, G.,Alton, A.,Alverson, G.,Alves, G. A.,Anastasoaie, M.,And American Physical Society 2006 Physical Review Letters Vol.97 No.11
Measurement of the top quark mass in final states with two leptons
Abazov, V. M.,Abbott, B.,Abolins, M.,Acharya, B. S.,Adams, M.,Adams, T.,Aguilo, E.,Ahsan, M.,Alexeev, G. D.,Alkhazov, G.,Alton, A.,Alverson, G.,Alves, G. A.,Ancu, L. S.,Andeen, T.,Anzelc, M. S.,Aoki, American Physical Society 2009 PHYSICAL REVIEW D - Vol.80 No.9