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Measurement Of The Depth Of Maximum Of Extensive Air Showers Above 1018 Ev, J. Abraham, Gregory Snow, Pierre Auger Collaboration
Measurement Of The Depth Of Maximum Of Extensive Air Showers Above 1018 Ev, J. Abraham, Gregory Snow, Pierre Auger Collaboration
Gregory Snow Publications
We describe the measurement of the depth of maximum, Xmax, of the longitudinal development of air showers induced by cosmic rays. Almost 4000 events above 1018 eV observed by the fluorescence detector of the Pierre Auger Observatory in coincidence with at least one surface detector station are selected for the analysis. The average shower maximum was found to evolve with energy at a rate of (106+35-21) g/cm2/decade below 1018.24 ±0.05 eV, and (24 ± 3) g/cm2/decade above this energy. The measured shower-to-shower fluctuations decrease from about 55 to 26 …
Transverse-Momentum And Pseudorapidity Distributions Of Charged Hadrons In Pp Collisions At √S=7 Tev, V. Khachatryan, Kenneth A. Bloom, S. Bose, J. Butt, Daniel R. Claes, Aaron Dominguez, Michael Eads, J. Keller, T. Kelly, Ilya Kravchenko, J. Lazo-Flores, Carl Lundstedt, H. Malbouisson, Sudhir Malik, Gregory Snow, Cms Collaboration
Transverse-Momentum And Pseudorapidity Distributions Of Charged Hadrons In Pp Collisions At √S=7 Tev, V. Khachatryan, Kenneth A. Bloom, S. Bose, J. Butt, Daniel R. Claes, Aaron Dominguez, Michael Eads, J. Keller, T. Kelly, Ilya Kravchenko, J. Lazo-Flores, Carl Lundstedt, H. Malbouisson, Sudhir Malik, Gregory Snow, Cms Collaboration
Gregory Snow Publications
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at √s=7 TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity dNch=dη ⃒|η|<0.5= 5.78 ± 0.01(stat) ± 0.23(syst) for non-single-diffractive events, higher than predicted by commonly used models. The relative increase in charged-particle multiplicity from √s=0.9 to 7 TeV is [±66.1 ± 1.0(stat) ± 4.2(syst)]%. The mean transverse …
First Measurement Of Bose-Einstein Correlations In Proton-Proton Collisions At √S=0.9 And 2.36 Tev At The Lhc, V. Khachatryan, Kenneth A. Bloom, S. Bose, J. Butt, Daniel R. Claes, Aaron Dominguez, M. Eads, J. Keller, T. Kelly, Ilya Kravchenko, J. Lazo-Flores, C. Lundstedt, H. Malbouisson, S. Malik, Gregory Snow, Cms Collaboration
First Measurement Of Bose-Einstein Correlations In Proton-Proton Collisions At √S=0.9 And 2.36 Tev At The Lhc, V. Khachatryan, Kenneth A. Bloom, S. Bose, J. Butt, Daniel R. Claes, Aaron Dominguez, M. Eads, J. Keller, T. Kelly, Ilya Kravchenko, J. Lazo-Flores, C. Lundstedt, H. Malbouisson, S. Malik, Gregory Snow, Cms Collaboration
Gregory Snow Publications
Bose-Einstein correlations have been measured using samples of proton-proton collisions at 0.9 and 2.36 TeV center-of-mass energies, recorded by the CMS experiment at the CERN Large Hadron Collider. The signal is observed in the form of an enhancement of pairs of same-sign charged particles with small relative four-momentum. The size of the correlated particle emission region is seen to increase significantly with the particle multiplicity of the event.