Experimento CMS - Brasil

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1 Experimento CMS - Brasil Relatório de Atividades Introdução O principal objetivo do experimento CMS é o estudo das leis fundamentais da Natureza em energias muito altas. Além da busca pelo elusivo bóson de Higgs, a última peça que faltava no Modelo Padrão de Física de Partículas, o CMS é capaz de investigar a existência de novas partículas e interações. Durante o ano de 2011 o CMS coletou os dados obtidos da colisão de feixes de prótons à energia de centro de massa de 7 TeV. Os resultados das análises dessas observações foram apresentados em 105 artigos científicos publicados em revistas indexadas. Contando com 48 membros, a participação do grupo brasileiro no experimento resultou, entre outros, na produção de cinco dissertações de mestrado e uma tese de doutorado. 2 Lista de Autores Doutores 1. Alberto Santoro UERJ 2. André Sznajder UERJ 3. Carley Pedro de Oliveira Martins UERJ 4. Dilson de Jesus Damiao CBPF 5. Eduardo de Moraes Gregores UFABC 6. Franciole da Cunha Marinho UNESP 7. Gilvan Augusto Alves CBPF 8. Hélio Nogima UERJ 9. Luiz Mundim UERJ 10. Maria Elena Pol CBPF 11. Moacyr Henrique Gomes e Souza CBPF 12. Pedro Galli Mercadante UFABC 13. Sandra Padula UNESP 14. Sérgio Ferraz Novaes UNESP 15. Vitor Oguri UERJ 16. Wagner de Paula Carvalho UERJ 17. Wanda Lúcia Prado Da Silva UERJ 1

2 3 Demais Membros do Experimento 1. Alan Malta Rodrigues Engenheiro UERJ 2. Alessandro Zachi Engenheiro CEFET 3. Analu Cusódio Estudante de Mestrado UERJ 4. Caio Laganá Estudante de Mestrado UNESP 5. Cesar Augusto Bernardes Estudante de Mestrado UFABC 6. Diego Matos Figueiredo Estudante de Mestrado UERJ 7. Douglas Milanez Engenheiro UERJ 8. Eduardo Bach Técnico UNESP 9. Eduardo Coelho Estudante de Mestrado UERJ 10. Eduardo Revoredo Engenheiro UERJ 11. Eliza Melo Da Costa Estudante de Doutorado UERJ 12. Ewerton Das Chagas Estudante de Mestrado UERJ 13. Fabiana Fortes Rodrigues Estudante de Mestrado UERJ 14. Jadir Marra Da Silva Técnico UNESP 15. José Afonso Lajas Sanches Engenheiro UERJ 16. José Cupertino Ruiz Vargas Estudante de Mestrado UNESP 17. Jorge Molina Professor UNA/PARAGUAI 18. Lina Milena Huertas Guativa Estudante de Mestrado UERJ 19. Lucas de Brito Cavalcanti Estudante de Mestrado CBPF 20. Luiz Gustavo Dornelas Estudante de Mestrado UERJ 21. Marcio Antonio Costa Técnico UNESP 22. Marcos Correa Martins Jr. Estudante de Doutorado CBPF 23. Marília da Silva Ramos Carneiro Estudante de Mestrado CBPF 24. Mario Vaz Engenheiro CBPF 25. Renata Salles Estudante de Mestrado UERJ 26. Rogerio Luiz Iope Engenheiro UNESP 27. Sergio Moraes Lietti Pesquisador Doutor UNESP 28. Tiago dos Anjos Estudante de Mestrado UFABC 29. Thiago dos Reis Martins Estudante de Doutorado CBPF 30. Thiago Tomei Estudante de Doutorado UNESP 31. Walter Luiz Aldá Júnior Estudante de Mestrado UERJ 4 Dissertações de Mestrado Concluídas 1. Título: Análise da produção de dijatos de difração simples no Experimento CMS/LHC Estudante: Diego de Matos Figueiredo Orientador: Alberto Santoro Co-orientador: Carley Martins Instituição: UERJ 2

3 2. Título: Estudo de lacunas de rapidez e caracterização de processos difrativos em eventos de minimum bias a 7 TeV no CMS/LHC Estudante: Luana Soares Jorge Orientador:Wagner de Paula Carvalho Co-orientador: Wanda Lúcia Prado da Silva Instituição: UERJ 3. Título: Evidências experimentais de eventos difrativos em colisões próton-próton à energia de 7 TeV Estudante: Ana Thereza Bastos Garcia da Rosa Orientador: Vitor Oguri Co-orientador: Alberto Santoro Instituição: UERJ 4. Título: Estudo da produção exclusiva do méson no experimento CMS/LHC Estudante: Marília da Silva Ramos Carneiro Orientador: Gilvan Augusto Alves Instituição: CBPF 5. Título: Procura do bóson de Higgs utilizando o Método de Elemento de matriz no canal no experimento CMS do CERN Estudante: Analu Verçosa Custódio Orientador: André Sznajder Instituição: UERJ 5 Teses de Doutorado Concluídas 1. Título: Observação de eventos de dijatos de alto separados por uma lacuna de rapidez no ambiente de BFKL no CMS Estudante: Sheila Mara Silva do Amaral Orientador: Alberto Santoro Co-orientador: Wagner de Paula Carvalho Instituição: UERJ 6 Notas Internas, Notas Públicas e Notas de Análise 1. CMS-IN-2011/024 Calibration of CASTOR: Status and Prospects 2. CMS-EXO-2011/061 Search for RS Gravitons decaying into a Jet plus MET. 3. CMS-EXO-2011/081 Search for exotic VZ resonances decaying into a jet and dileptons with CMS, 3

4 4. CMS-AN-2011/025 Measurement of the Forward-Backward Asymmetry (AFB) in Z e + e Events in CMS at s = 7 TeV. 5. CMS-AN-2011/077 Energy Flow in 2.76 TeV Lead-Lead Colisions. 6. CMS-AN-2011/226 Search for Randall-Sundrum Gravitons Decaying into a Jet plus Missing E T at CMS. 7. CMS-AN-2011/414 Search for exotic resonances decaying into V + Z using final states with a jet and a lepton pair. 8. CMS AN-2011/436 Azimuthal anisotropy of charged hadrons at high transverse momentum in PbPb collisions at s NN = 2.76 TeV. 9. CMS-AN-2011/473 Search for High-Mass Resonances Decaying to Muon Pairs with Collisions Gathered at s = 7 TeV. 7 Publicações em Periódicos 1. Operation and performance of the CMS silicon tracking detector M. A. Borgia [CMS Collaboration] /j.nima Nucl. Instrum. Meth. A 658, 2 (2011). 2. Evolution of silicon sensors characteristics of the current CMS tracker C. Barth [CMS Collaboration] /j.nima Nucl. Instrum. Meth. A 658, 6 (2011). 3. Campaign to identify the future CMS tracker baseline K. H. Hoffmann [CMS Tracker Sensor Collaboration] /j.nima Nucl. Instrum. Meth. A 658, 30 (2011). 4. Operation of the CMS silicon strip tracker Y. Gotra [CMS Collaboration] /j.nima Nucl. Instrum. Meth. A 652, 680 (2011). 5. Plans for an upgraded CMS pixel detector A. Bean [CMS Collaboration] /j.nima Nucl. Instrum. Meth. A 650, 41 (2011). 4

5 6. Tracking and vertexing capabilities of the CMS tracking detector with the first LHC data M. E. Dinardo [CMS Collaboration] /j.nima Nucl. Instrum. Meth. A 650, 224 (2011). 7. Offline calibrations and performance of the CMS pixel detector U. Langenegger [CMS Collaboration] /j.nima Nucl. Instrum. Meth. A 650, 25 (2011). 8. Silicon sensor development for the CMS tracker upgrade G. Auzinger [CMS Collaboration] / /6/10/P10010 JINST 6, P10010 (2011). 9. Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC arxiv: [hep-ex] /PhysRevD Phys. Rev. D 84, (2011) 10. Search for a Vector-like Quark with Charge 2/3 in t + Z Events from pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 107, (2011) 11. Search for Supersymmetry at the LHC in Events with Jets and Missing Transverse Energy arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 107, (2011) 12. Measurement of the t t Production Cross Section in pp Collisions at 7 TeV in Lepton + Jets Events Using b-quark Jet Identification arxiv: [hep-ex] /PhysRevD Phys. Rev. D 84, (2011) 5

6 13. Measurement of the Differential Cross Section for Isolated Prompt Photon Production in pp Collisions at 7 TeV arxiv: [hep-ex] /PhysRevD Phys. Rev. D 84, (2011) 14. First CMS results from PbPb collisions P. Shukla [CMS Collaboration] /j.nuclphysa Nucl. Phys. A , 85 (2011). 15. Measurement of the Drell-Yan Cross Section in pp Collisions arxiv: [hep-ex] /JHEP10(2011)007 JHEP 1110, 007 (2011) 16. Jet reconstruction in CMS using charged tracks only A. Hinzmann [CMS Collaboration] /S Int. J. Mod. Phys. E 20, 1556 (2011). 17. Particle identification by ionization energy loss in the CMS silicon strip tracker A. Giammanco [CMS Collaboration] /S Int. J. Mod. Phys. E 20, 1646 (2011). 18. Search for B(s) and B to dimuon decays in pp collisions at 7 TeV arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 107, (2011) 19. Search for Resonances in the Dijet Mass Spectrum from 7 TeV pp Collisions at CMS arxiv: [hep-ex] /j.physletb Phys. Lett. B 704, 123 (2011) 20. Measurement of the Inclusive W and Z Production Cross Sections in pp Collisions arxiv: [hep-ex] 6

7 /JHEP10(2011)132 JHEP 1110, 132 (2011) 21. Dependence on pseudorapidity and centrality of charged hadron production in PbPb collisions at a nucleon-nucleon centre-of-mass energy of 2.76 TeV arxiv: [nucl-ex] /JHEP08(2011)141 JHEP 1108, 141 (2011) 22. Determination of Jet Energy Calibration and Transverse Momentum Resolution in CMS arxiv: [physics.ins-det] / /6/11/P11002 JINST 6, P11002 (2011) 23. Search for Three-Jet Resonances in pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 107, (2011) 24. Conceptual study of a trigger module for the CMS tracker at SLHC G. Hall [CMS Collaboration] /j.nima Nucl. Instrum. Meth. A 636, S201 (2011). 25. Physics at the LHC and slhc K. Jakobs [ATLAS and CMS Collaborations] /j.nima Nucl. Instrum. Meth. A 636, S1 (2011). 26. Upgrade of the CMS tracker K. Gill [CMS Collaboration] /j.nima Nucl. Instrum. Meth. A 636, S194 (2011). 27. Search for supersymmetry in pp collisions at s = 7 TeV in events with a single lepton, jets, and missing transverse momentum arxiv: [hep-ex] /JHEP08(2011)156 JHEP 1108, 156 (2011) 7

8 28. A search for excited leptons in pp Collisions arxiv: [hep-ex] /j.physletb Phys. Lett. B 704, 143 (2011) 29. Measurement of the Underlying Event Activity at the LHC with s = 7 TeV and Comparison with s = 0.9 TeV arxiv: [hep-ex] /JHEP09(2011)109 JHEP 1109, 109 (2011) 30. Missing transverse energy performance of the CMS detector arxiv: [physics.ins-det] / /6/09/P09001 JINST 6, P09001 (2011) 31. Search for New Physics with a Mono-Jet and Missing Transverse Energy in pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 107, (2011) 32. Search for New Physics with Jets and Missing Transverse Momentum in pp collisions arxiv: [hep-ex] /JHEP08(2011)155 JHEP 1108, 155 (2011) 33. Measurement of the Strange B Meson Production Cross Section with J/Psi φ Decays in pp Collisions arxiv: [hep-ex] /PhysRevD Phys. Rev. D 84, (2011) 34. Search for Supersymmetry in Events with b Jets and Missing Transverse Momentum at the LHC arxiv: [hep-ex] 8

9 /JHEP07(2011)113 JHEP 1107, 113 (2011) 35. Measurement of the t-channel single top quark production cross section in pp collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 107, (2011) 36. Search for Light Resonances Decaying into Pairs of Muons as a Signal of New Physics arxiv: [hep-ex] /JHEP07(2011)098 JHEP 1107, 098 (2011) 37. Search for Same-Sign Top-Quark Pair Production at s = 7 TeV and Limits on Flavour Changing Neutral Currents in the Top Sector arxiv: [hep-ex] /JHEP08(2011)005 JHEP 1108, 005 (2011) 38. Measurement of the Top-antitop Production Cross Section in pp Collisions at s = 7 TeV using the Kinematic Properties of Events with Leptons and Jets arxiv: [hep-ex] /epjc/s Eur. Phys. J. C 71, 1721 (2011) 39. Search for Physics Beyond the Standard Model Using Multilepton Signatures in pp Collisions arxiv: [hep-ex] /j.physletb Phys. Lett. B 704, 411 (2011) 40. Measurement of the Ratio of the 3-jet to 2-jet Cross Sections in pp Collisions at s = 7 TeV arxiv: [hep-ex] /j.physletb Phys. Lett. B 702, 336 (2011) 9

10 41. Measurement of the Inclusive Jet Cross Section in pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 107, (2011) 42. Measurement of the t t production cross section and the top quark mass in the dilepton channel in pp collisions arxiv: [hep-ex] /JHEP07(2011)049 JHEP 1107, 049 (2011) 43. Search for First Generation Scalar Leptoquarks in the evjj channel in pp collisions arxiv: [hep-ex] /j.physletb Phys. Lett. B 703, 246 (2011) 44. Indications of suppression of excited Υ states in PbPb collisions at S NN = 2.76 TeV arxiv: [nucl-ex] /PhysRevLett Phys. Rev. Lett. 107, (2011) 45. Search for supersymmetry in events with a lepton, a photon, and large missing transverse energy in pp collisions arxiv: [hep-ex] /JHEP06(2011)093 JHEP 1106, 093 (2011) 46. Measurement of W γ and Zγ production in pp collisions arxiv: [hep-ex] /j.physletb Phys. Lett. B 701, 535 (2011) 47. Long-range and short-range dihadron angular correlations in central PbPb collisions at a nucleon-nucleon center of mass energy of 2.76 TeV arxiv: [nucl-ex] 10

11 /JHEP07(2011)076 JHEP 1107, 076 (2011) 48. Charged particle transverse momentum spectra in pp collisions at s = 0.9 and 7 TeV arxiv: [hep-ex] /JHEP08(2011)086 JHEP 1108, 086 (2011) 49. Measurement of the Polarization of W Bosons with Large Transverse Momenta in W+Jets Events at the LHC arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 107, (2011) 50. Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy at the LHC arxiv: [hep-ex] /JHEP06(2011)077 JHEP 1106, 077 (2011) 51. Measurement of the B 0 production cross section in pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 52. Measurement of the differential dijet production cross section in proton-proton collisions arxiv: [hep-ex] /j.physletb Phys. Lett. B 700, 187 (2011) 53. Measurement of the Inclusive Z Cross Section via Decays to Tau Pairs in pp Collisions arxiv: [hep-ex] /JHEP08(2011)117 JHEP 1108, 117 (2011) 11

12 54. Search for Neutral MSSM Higgs Bosons Decaying to Tau Pairs in pp Collisions at s = 7 TeV arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 55. A New CMS pixel detector for the LHC luminosity upgrade C. Favaro [CMS Collaboration]. arxiv: [physics.ins-det] /j.nima Nucl. Instrum. Meth. A 658, 41 (2011) 56. Search for Large Extra Dimensions in the Diphoton Final State at the Large Hadron Collider arxiv: [hep-ex] /JHEP05(2011)085 JHEP 1105, 085 (2011) 57. Measurement of the lepton charge asymmetry in inclusive W production in pp collisions arxiv: [hep-ex] /JHEP04(2011)050 JHEP 1104, 050 (2011) 58. Calibration, alignment and tracking performance of the CMS silicon strip tracker M. Weber [CMS Collaboration] /j.nima Nucl. Instrum. Meth. A 628, 59 (2011). 59. Operational experience with the CMS pixel detectors W. E. Johns [CMS Collaboration] /j.nima Nucl. Instrum. Meth. A 628, 84 (2011). 60. Performance of CMS ECAL with first LHC data G. Franzoni [CMS Collaboration] /j.nima Nucl. Instrum. Meth. A 628, 90 (2011). 61. CMS muon detector and trigger performance D. Piccolo [CMS Collaboration]. 12

13 /j.nima Nucl. Instrum. Meth. A 628, 142 (2011). 62. Search for Physics Beyond the Standard Model in Opposite-Sign Dilepton Events at s = 7 TeV arxiv: [hep-ex] /JHEP06(2011)026 JHEP 1106, 026 (2011) 63. Search for Supersymmetry in pp Collisions at s = 7 TeV in Events with Two Photons and Missing Transverse Energy arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 64. Search for Resonances in the Dilepton Mass Distribution in pp Collisions at s = 7 TeV arxiv: [hep-ex] /JHEP05(2011)093 JHEP 1105, 093 (2011) 65. Search for a W boson decaying to a muon and a neutrino in pp collisions at s = 7 TeV arxiv: [hep-ex] /j.physletb Phys. Lett. B 701, 160 (2011) 66. Measurement of W + W Production and Search for the Higgs Boson in pp Collisions arxiv: [hep-ex] /j.physletb Phys. Lett. B 699, 25 (2011) 67. Study of Z boson production in PbPb collisions at nucleon-nucleon centre of mass energy = 2.76 TeV arxiv: [nucl-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 13

14 68. Search for a Heavy Bottom-like Quark in pp Collisions arxiv: [hep-ex] /j.physletb Phys. Lett. B 701, 204 (2011) 69. Strange Particle Production in pp Collisions at s = 0.9 and 7 TeV arxiv: [hep-ex] /JHEP05(2011)064 JHEP 1105, 064 (2011) 70. Measurement of B B Angular Correlations based on Secondary Vertex Reconstruction arxiv: [hep-ex] /JHEP03(2011)136 JHEP 1103, 136 (2011) 71. Experience with CMS electronics in 7-TeV operation A. Ryd [CMS Collaboration] / /6/01/C01097 JINST 6, C01097 (2011). 72. Measurement of Dijet Angular Distributions and Search for Quark Compositeness in pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 73. Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV arxiv: [nucl-ex] /PhysRevC Phys. Rev. C 84, (2011) 74. First Measurement of Hadronic Event Shapes in pp Collisions arxiv: [hep-ex] /j.physletb Phys. Lett. B 699, 48 (2011) 14

15 75. Dijet Azimuthal Decorrelations in pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 76. Inclusive b-hadron production cross section with muons in pp collisions at s = 7 TeV arxiv: [hep-ex] /JHEP03(2011)090 JHEP 1103, 090 (2011) 77. Measurement of Bose-Einstein Correlations in pp Collisions at s = 0.9 and 7 TeV arxiv: [hep-ex] /JHEP05(2011)029 JHEP 1105, 029 (2011) 78. The Online Calibration, Operation, and Performance of the CMS Pixel Detector B. Kreis [CMS Collaboration]. arxiv: [physics.ins-det] /j.nima Nucl. Instrum. Meth. A 650, 14 (2011) 79. Search for Supersymmetry in pp Collisions at 7 TeV in Events with Jets and Missing Transverse Energy arxiv: [hep-ex] /j.physletb Phys. Lett. B 698, 196 (2011) 80. Search for Heavy Stable Charged Particles in pp collisions arxiv: [hep-ex] /JHEP03(2011)024 JHEP 1103, 024 (2011) 81. Measurement of the B + Production Cross Section in pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 15

16 82. Search for a heavy gauge boson W in the final state with an electron and large missing transverse energy in pp collisions arxiv: [hep-ex] /j.physletb Phys. Lett. B 698, 21 (2011) 83. Measurement of the Inclusive Υ production cross section in pp collisions at s = 7 TeV arxiv: [hep-ex] /PhysRevD Phys. Rev. D 83, (2011) 84. Search for Pair Production of First-Generation Scalar Leptoquarks in pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 85. Search for Pair Production of Second-Generation Scalar Leptoquarks in pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 86. Search for Microscopic Black Hole Signatures at the Large Hadron Collider arxiv: [hep-ex] /j.physletb Phys. Lett. B 697, 434 (2011) 87. Measurements of Inclusive W and Z Cross Sections in pp Collisions arxiv: [hep-ex] /JHEP01(2011)080 JHEP 1101, 080 (2011) 88. Measurement of the Isolated Prompt Photon Production Cross Section in pp Collisions arxiv: [hep-ex] 16

17 /PhysRevLett Phys. Rev. Lett. 106, (2011) 89. Charged particle multiplicities in pp interactions at s = 0.9, 2.36, and 7 TeV arxiv: [hep-ex] /JHEP01(2011)079 JHEP 1101, 079 (2011) 90. Search for Stopped Gluinos in pp collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 91. Prompt and non-prompt J/ψ production in pp collisions arxiv: [hep-ex] /epjc/s Eur. Phys. J. C 71, 1575 (2011) 92. First Measurement of the Cross Section for Top-Quark Pair Production in Proton- Proton Collisions arxiv: [hep-ex] /j.physletb Phys. Lett. B 695, 424 (2011) 93. First Alignment of the Complete CMS Tracker F. Meier [CMS Tracker Collaboration]. arxiv: [physics.ins-det] /j.nima Nucl. Instrum. Meth. A 636, S177 (2011) 94. Search for a heavy gauge boson W in the final state with an electron and large missing transverse energy in pp collisions arxiv: [hep-ex] /j.physletb Phys. Lett. B 698, 21 (2011) 95. Measurement of the Inclusive υ production cross section in pp collisions at s = 7 TeV arxiv: [hep-ex] 17

18 /PhysRevD Phys. Rev. D 83, (2011) 96. Search for Pair Production of First-Generation Scalar Leptoquarks in pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 97. Search for Pair Production of Second-Generation Scalar Leptoquarks in pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 98. Search for Microscopic Black Hole Signatures at the Large Hadron Collider arxiv: [hep-ex] /j.physletb Phys. Lett. B 697, 434 (2011) 99. Measurements of Inclusive W and Z Cross Sections in pp Collisions arxiv: [hep-ex] /JHEP01(2011)080 JHEP 1101, 080 (2011) 100. Measurement of the Isolated Prompt Photon Production Cross Section in pp Collisions arxiv: [hep-ex] /PhysRevLett Phys. Rev. Lett. 106, (2011) 101. Charged particle multiplicities in pp interactions at s = 0.9, 2.36, and 7 TeV arxiv: [hep-ex] /JHEP01(2011)079 JHEP 1101, 079 (2011) 102. Search for Stopped Gluinos in pp collisions arxiv: [hep-ex] 18

19 /PhysRevLett Phys. Rev. Lett. 106, (2011) 103. Prompt and non-prompt J/ψ production in pp collisions arxiv: [hep-ex] /epjc/s Eur. Phys. J. C 71, 1575 (2011) 104. First Measurement of the Cross Section for Top-Quark Pair Production in Proton- Proton Collisions arxiv: [hep-ex] /j.physletb Phys. Lett. B 695, 424 (2011) 105. First Alignment of the Complete CMS Tracker F. Meier [CMS Tracker Collaboration]. arxiv: [physics.ins-det] /j.nima Nucl. Instrum. Meth. A 636, S177 (2011) 19