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Alexeev, Evgeny M.,Catanzaro, Alessandro,Skrypka, Oleksandr V.,Nayak, Pramoda K.,Ahn, Seongjoon,Pak, Sangyeon,Lee, Juwon,Sohn, Jung Inn,Novoselov, Kostya S.,Shin, Hyeon Suk,Tartakovskii, Alexander I. American Chemical Society 2017 Nano letters Vol.17 No.9
<P>Vertically stacked atomic layers from different layered crystals can be held together by van der Waals forces, which can be used for building novel heterostructures, offering a platform for developing a new generation of atomically thin, transparent, and flexible devices. The performance of these devices is critically dependent on the layer thickness and the interlayer electronic coupling, influencing the hybridization of the electronic states as well as charge and energy transfer between the layers. The electronic coupling is affected by the relative orientation of the layers as well as by the cleanliness of their interfaces. Here, we demonstrate an efficient method for monitoring interlayer coupling in heterostructures made from transition metal dichalcogenides using photoluminescence imaging in a bright-field optical microscope. The color and brightness in such images are used here to identify mono- and few-layer crystals and to track changes in the interlayer coupling and the emergence of interlayer excitons after thermal annealing in heterobilayers composed of mechanically exfoliated flakes and as a function of the twist angle in atomic layers grown by chemical vapor deposition. Material and crystal thickness' sensitivity of the presented imaging technique makes it a powerful tool for characterization of van der Waals heterostructures assembled by a wide variety of methods, using combinations of materials obtained through mechanical or chemical exfoliation and crystal growth.</P>
Resonantly hybridized excitons in moiré superlattices in van der Waals heterostructures
Alexeev, Evgeny M.,Ruiz-Tijerina, David A.,Danovich, Mark,Hamer, Matthew J.,Terry, Daniel J.,Nayak, Pramoda K.,Ahn, Seongjoon,Pak, Sangyeon,Lee, Juwon,Sohn, Jung Inn,Molas, Maciej R.,Koperski, Maciej Nature Publishing Group 2019 Nature Vol.567 No.7746
Abazov, V.M.,Abbott, B.,Acharya, B.S.,Adams, M.,Adams, T.,Alexeev, G.D.,Alkhazov, G.,Alton, A.,Alverson, G.,Aoki, M.,Askew, A.,Atkins, S.,Augsten, K.,Avila, C.,Badaud, F.,Bagby, L.,Baldin, B.,Bandurin Elsevier 2012 Physics letters: B Vol.714 No.1
<P><B>Abstract</B></P><P>We present measurements of the differential cross section dσ/dpTγ for the inclusive production of a photon in association with a <I>b</I>-quark jet for photons with rapidities |<SUP>yγ</SUP>|<1.0 and 30<pTγ<300?GeV, as well as for photons with 1.5<|<SUP>yγ</SUP>|<2.5 and 30<pTγ<200?GeV, where pTγ is the photon transverse momentum. The <I>b</I>-quark jets are required to have <SUB>pT</SUB>>15 GeV and rapidity |<SUP>yjet</SUP>|<1.5. The results are based on data corresponding to an integrated luminosity of 8.7 fb<SUP>−1</SUP>, recorded with the D0 detector at the Fermilab Tevatron pp¯ Collider at s=1.96?TeV. The measured cross sections are compared with next-to-leading order perturbative QCD calculations using different sets of parton distribution functions as well as to predictions based on the <SUB>kT</SUB>-factorization QCD approach, and those from the <SMALL>SHERPA</SMALL> and <SMALL>PYTHIA</SMALL> Monte Carlo event generators.</P>
Measurement of the Angular and Lifetime Parameters of the DecaysBd0→J/ψK*0andBs0→J/ψϕ
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.3
<P>We present measurements of the linear polarization amplitudes and the strong relative phases that describe the flavor-untagged decays Bd0-->J/psiK*0 and Bs0-->J/psiphi in the transversity basis. We also measure the mean lifetime taus of the Bs0 mass eigenstates and the lifetime ratio taus/taud. The analyses are based on approximately 2.8 fb(-1) of data recorded with the D0 detector. From our measurements of the angular parameters we conclude that there is no evidence for a deviation from flavor SU(3) symmetry for these decays and that the factorization assumption is not valid for the Bd0-->J/psiK*0 decay.</P>
Observation of Single Top-Quark Production
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.9
<P>We report observation of the electroweak production of single top quarks in pp[over ] collisions at sqrt[s]=1.96 TeV based on 2.3 fb(-1) of data collected by the D0 detector at the Fermilab Tevatron Collider. Using events containing an isolated electron or muon and missing transverse energy, together with jets originating from the fragmentation of b quarks, we measure a cross section of sigma(pp[over ]--> tb + X, tqb + X) = 3.94 + or - 0.88 pb. The probability to measure a cross section at this value or higher in the absence of signal is 2.5 x 10(-7), corresponding to a 5.0 standard deviation significance for the observation.</P>
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.,Andrieu, Elsevier 2009 Physics letters: B Vol.680 No.1
<P><B>Abstract</B></P><P>We report the results of a search for associated production of charginos and neutralinos using a data set corresponding to an integrated luminosity of 2.3 fb<SUP>−1</SUP> collected with the DØ experiment during Run II of the Tevatron proton–antiproton collider. Final states containing three charged leptons and missing transverse energy are probed for a signal from supersymmetry with four dedicated trilepton event selections. No evidence for a signal is observed, and we set limits on the product of production cross section and leptonic branching fraction. Within minimal supergravity, these limits translate into bounds on <SUB>m0</SUB> and <SUB>m1/2</SUB> that are well beyond existing limits.</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>
Bs0lifetime measurement in theCP-odd decay channelBs0→J/ψ f0(980)
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.,Aushev, V.,Aushev, Y.,Avila, C.,Badaud, F.,Bagby, L.,Bal American Physical Society 2016 Physical Review D Vol.94 No.1
<P>The lifetime of the B-s(0) meson is measured in the decay channel B-s(0) -> J/Psi pi(+)pi(-) with 880 <= M pi+pi- <= 1080 MeV/c(2), which is mainly a CP-odd state and dominated by the f(0)(980) resonance. In 10.4 fb(-1) of data collected with the D0 detector in Run II of the Tevatron, the lifetime of the B-s(0) meson is measured to be tau(B-s(0)) = 1.70 +/- 0.14(stat) +/- 0.05(syst) ps. Neglecting CP violation in B-s(0)/(B) over bar (0)(s) mixing, the measurement can be translated into the width of the heavy mass eigenstate of the B-s(0), Gamma(H) = 0.59 +/- 0.05(stat) +/- 0.02(syst) ps(-1).</P>