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Browsing MIT Open Access Articles by Title

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  • Observation of Exclusive γγ Production in pp̅ Collisions at √s=1.96  TeV 
    Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Paus, Christoph M. E. (American Physical Society, 2012-02)
    We have observed exclusive γγ production in proton-antiproton collisions at √s=1.96  TeV, using data from 1.11±0.07  fb[superscript -1] integrated luminosity taken by the Run II Collider Detector at Fermilab. We selected ...
  • Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms 
    Sommer, Ariel Tjodolv; Wu, Cheng-Hsun; Zwierlein, Martin Wolfram; Schirotzek, Andre (American Physical Society, 2009-06)
    We have observed Fermi polarons, dressed spin-down impurities in a spin-up Fermi sea of ultracold atoms. The polaron manifests itself as a narrow peak in the impurities’ rf spectrum that emerges from a broad incoherent ...
  • Observation of ion cyclotron range of frequencies mode conversion plasma flow drive on Alcator C-Mod 
    Lin, Yijun; Rice, John E.; Wukitch, Stephen James; Greenwald, Martin J.; Hubbard, Amanda E.; Alex, Ince-Cushman; Lin, Liang; Marmar, Earl S.; Porkolab, Miklos; Reinke, Matthew Logan; Tsujii, Naoto; Wright, John C. (American Institute of Physics, 2009-03)
    At modest [superscript 3]He levels (n[subscript 3He]/n[subscript e]~8%–12%), in relatively low density D([superscript 3]He) plasmas, [overline n]e<=1.3×10[superscript 20] m[superscript −3], heated with 50 MHz rf power at ...
  • Observation of long-range, near-side angular correlations in proton-proton collisions at the LHC 
    Alver, Burak Han; Bauer, Gerry P.; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Dutta, Valentina; Everaerts, Pieter Bruno Bart; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Harris, P.; Kim, Y.; Klute, Markus; Lee, Y. J.; Li, W.; Loizides, Constantin; Luckey, P. David, Jr.; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Roland, Christof E.; Roland, Gunther M.; Rudolph, M.; Stephans, George S. F.; Sumorok, Konstanty C.; Sung, Kevin Kai Hong; Wenger, Edward Allen; Wyslouch, B.; Xie, S.; Yang, M.; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco (Springer-Verlag, 2010-09)
    Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a ...
  • Observation of magnetic edge state in graphene nanoribbons 
    Joly, V. L. Joseph; Kiguchi, Manabu; Hao, Si-Jia; Takai, Kazuyuki; Enoki, Toshiaki; Sumii, Ryohei; Amemiya, Kenta; Muramatsu, Hiroyuki; Hayashi, Takuya; Kim, Yoong Ahm; Endo, Morinobu; Campos-Delgado, Jessica; López-Urías, Florentino; Botello-Méndez, Andrés; Terrones, Humberto; Terrones, Mauricio; Dresselhaus, Mildred (American Physical Society, 2010-05)
    The electronic structure and spin magnetism for few-layer-graphene nanoribbons synthesized by chemical vapor deposition have been investigated using near-edge x-ray absorption fine structure (NEXAFS) and electron-spin ...
  • Observation of New Charmless Decays of Bottom Hadrons 
    Xie, Si; Makhoul, K.; Knuteson, Bruce O.; Henderson, C.; Hahn, Kristian Allan; Goncharov, M.; Gomez-Ceballos, Guillelmo; Choudalakis, Georgios; Bauer, Gerry P.; Paus, Christoph M. E. (American Physical Society, 2009-07)
    We search for new charmless decays of neutral b hadrons to pairs of charged hadrons, using 1  fb[superscript -1] of data collected by the CDF II detector at the Fermilab Tevatron. We report the first observation of the ...
  • Observation of new resonances decaying to D pi and D*pi in inclusive e(+)e(-) collisions near root s=10.58 GeV 
    Cowan, Ray Franklin; Dujmic, Denis; Sciolla, Gabriella; Zhao, Min Liang (American Physical Society, 2010-12)
    We present a study of the D+π- [D superscript + pi superscript -], D0π+ [D superscript 0 pi superscript *], and D*+π- [D superscript *+ pi superscript -] systems in inclusive e+e-→cc̅ [e superscript + e superscript - → ...
  • Observation of nonequilibrium carrier distribution in Ge, Si, and GaAs by terahertz pump-terahertz probe measurements 
    Hebling, Janos; Hoffmann, Matthias C.; Hwang, Harold Young; Yeh, Ka-Lo; Nelson, Keith Adam (American Physical Society, 2010-01)
    We compare the observed strong saturation of the free-carrier absorption in n-type semiconductors at 300 K in the terahertz (THz) frequency range when single-cycle pulses with intensities up to 150 MW/cm[superscript 2] ...
  • Observation of pi+pi-pi+pi- photoproduction in ultraperipheral heavy-ion collisions at [sqrt]sNN=200 GeV at the STAR detector 
    Surrow, Bernd; Balewski, Jan T.; Betancourt, Michael Joseph; Corliss, Ross Cameron; Hays-Wehle, James Prewitt; Hoffman, A. M.; Jones, Christopher LaDon; Kocoloski, Adam Philip; Leight, William Axel; Milner, Richard G.; Redwine, Robert P.; Sakuma, Tai; Seele, Joseph Patrick; van Nieuwenhuizen, Gerrit Jan; Walker, M. (American Physical Society, 2010-04)
    We present a measurement of pi+pi-pi+pi-photonuclear production in ultraperipheral Au-Au collisions at [sqrt]sNN=200 GeV from the STAR experiment. The pi+pi-pi+pi- final states are observed at low transverse momentum and ...
  • Observation of quasi-ballistic heat transport at nano-interfaces using coherent soft X-ray beams 
    Nelson, Keith Adam; Anderson, Erik H.; Kapteyn, Henry C.; Li, Qing; Murname, Margaret M.; Siemens, Mark E.; Yang, Ronggui (Institute of Electrical and Electronics Engineers (IEEE), 2010-07)
    We make the first observation and quantitative measurement of quasi-ballistic thermal transport from a nanoscale heat source, finding a significant decrease in energy transport away from the hotspot compared with diffusive ...
  • Observation of Reversed Shear Alfvén Eigenmodes between Sawtooth Crashes in the Alcator C-Mod Tokamak 
    Kramer, G. J.; Wukitch, Stephen James; Porkolab, Miklos; Lin, Yijun; Lin, Liang; Edlund, Eric Matthias (American Physical Society, 2009-04)
    Groups of frequency chirping modes observed between sawtooth crashes in the Alcator C-Mod tokamak are interpreted as reversed shear Alfve´n eigenmodes near the q ¼ 1 surface. These modes indicate that a reversed shear q ...
  • Observation of Self-Generated Flows in Tokamak Plasmas with Lower-Hybrid-Driven Current 
    Rice, John E.; Ince-Cushman, Alexander; Reinke, Matthew Logan; Greenwald, Martin J.; Wallace, Gregory Marriner; Parker, Ronald R.; Fiore, Catherine L.; Hughes, Jerry W.; Bonoli, Paul T.; Shiraiwa, Shunichi; Hubbard, Amanda E.; Wolfe, Stephen M.; Hutchinson, Ian H.; Marmar, Earl S.; Bitter, M.; Wilson, J.; Hill, K. (American Physical Society, 2009-01)
    In Alcator C-Mod discharges lower hybrid waves have been shown to induce a countercurrent change in toroidal rotation of up to 60  km/s in the central region of the plasma (r/a~<0.4). This modification of the toroidal ...
  • Observation of Sequential Υ Suppression in PbPb Collisions 
    Apyan, Aram; Bauer, Gerry P.; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Dutta, Valentina; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Kim, Y.; Klute, Markus; Krajczar, Krisztian F.; Li, W.; Luckey, P. David, Jr.; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E.; Roland, Gunther M.; Rudolph, Matthew Scott; Stephans, George S. F.; Stockli, Fabian; Sumorok, Konstanty C.; Sung, Kevin Kai Hong; Velicanu, Dragos Alexandru; Wenger, Edward Allen; Wolf, R.; Wyslouch, Boleslaw; Xie, Si; Yang, M.; Yilmaz, Yetkin; Yoon, Andrew; Zanetti, Marco (American Physical Society, 2012-11)
    The suppression of the individual Υ(nS) states in PbPb collisions with respect to their yields in pp data has been measured. The PbPb and pp data sets used in the analysis correspond to integrated luminosities of ...
  • Observation of single top quark production and measurement of |Vtb| with CDF 
    Bauer, Gerry P.; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Makhoul, k; Paus, Christoph M. E. (American Physical Society, 2010-12)
    We report the observation of electroweak single top quark production in 3.2  fb-1 [fb superscript -1] of pp̅ collision data collected by the Collider Detector at Fermilab at √s=1.96  TeV [square root of s=1.96 TeV]. Candidate ...
  • Observation of Spin Correlation in tt̅ Events from pp Collisions at √s=7  TeV Using the ATLAS Detector 
    Taylor, Frank E. (American Physical Society, 2012-05)
    A measurement of spin correlation in tt̅ production is reported using data collected with the ATLAS detector at the LHC, corresponding to an integrated luminosity of 2.1  fb[superscript -1]. Candidate events are selected ...
  • Observation of strong electromagnetic fields around laser-entrance holes of ignition-scale hohlraums in inertial-confinement fusion experiments at the National Ignition Facility 
    Li, C. K.; Zylstra, Alex Bennett; Frenje, Johan A.; Seguin, Fredrick Hampton; Sinenian, Nareg; Petrasso, Richard D.; Amendt, P. A.; Bionta, R.; Friedrich, S.; Collins, G. W.; Dewald, E.; Doppner, T.; Glenzer, S. H.; Hicks, D. G.; Landen, O. L.; Kilkenny, J. D.; Mackinnon, A. J.; Meezan, N.; Ralph, J.; Rygg, J. R.; Kline, J.; Kyrala, G. (IOP Publishing, 2013-02)
    Energy spectra and spectrally resolved one-dimensional fluence images of self-emitted charged-fusion products (14.7 MeV D[superscript 3]He protons) are routinely measured from indirectly driven inertial-confinement fusion ...
  • Observation of the baryonic B-decay B-bar--> Lambda c+p-barK- pi + 
    Fisher, Peter H.; Cowan, Ray Franklin; Dujmic, Denis; Henderson, Shawn Wesley; Sciolla, Gabriella; Spitznagel, M.; Yamamoto, R. K.; Zhao, M. (American Physical Society, 2009-09)
    We report the observation of the baryonic B-decay B̅ 0-->Lambda c+p̅ K-pi+, excluding contributions from the decay B̅ 0-->Lambda c+Lambda K-. Using a data sample of 467×106 BB̅ pairs collected with the BABAR detector at ...
  • Observation of the baryonic B decay B̅ [supersrcipt 0]→Λ[subscript c]+Λ̅ K[superscript -] 
    Cowan, Ray Franklin; Dujmic, Denis; Sciolla, Gabriella (American Physical Society, 2011-10)
    We report the observation of the baryonic B decay B̅ [superscript 0]→Λ[subscript c][superscript +]Λ̅ K[superscript -] with a significance larger than 7 standard deviations based on 471×10[superscript 6] BB̅ pairs collected ...
  • Observation of the Baryonic Flavor-Changing Neutral Current Decay Λ[subscript b][superscript 0]→Λμ[superscript +]μ[superscript -] 
    Bauer, Gerry P.; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Makhoul, K.; Paus, Christoph M. E. (American Physical Society (APS), 2011-11)
    We report the first observation of the baryonic flavor-changing neutral current decay Λ[subscript b][superscript 0]→Λμ[superscript +]μ[superscript -] with 24 signal events and a statistical significance of 5.8 Gaussian ...
  • Observation of the chi _{c2}(2P) meson in the reaction gamma gamma -->DD[over -bar] at BABAR 
    Cowan, Ray Franklin; Dujmic, Denis; Fisher, Peter H.; Henderson, Shawn Wesley; Sciolla, Gabriella; Spitznagel, M.; Yamamoto, R. K.; Zhao, M. (American Physical Society, 2010-05)
    A search for the Z(3930) resonance in γγ production of the DD̅ system has been performed using a data sample corresponding to an integrated luminosity of 384  fb[superscript -1] recorded by the BABAR experiment at the ...
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