Browsing by Author "Tumasyan A"

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    Measurement of the charge ratio of atmospheric muons with the CMS detector
    (ELSEVIER SCIENCE BV, 1/01/2010) Khachatryan V; Sirunyan AM; Tumasyan A; Adam W; Bergauer T; Dragicevic M; Erö J; Fabjan C; Friedl M; Frühwirth R; Ghete VM; Hammer J; Hänsel S; Hoch M; Hörmann N; Hrubec J; Jeitler M; Kasieczka G; Kiesenhofer W; Krammer M; Liko D; Mikulec I; Pernicka M; Rohringer H; Schöfbeck R; Strauss J; Taurok A; Teischinger F; Waltenberger W; Walzel G; Widl E; Wulz CE; Mossolov V; Shumeiko N; Suarez Gonzalez J; Benucci L; Ceard L; De Wolf EA; Hashemi M; Janssen X; Maes T; Mucibello L; Ochesanu S; Roland B; Rougny R; Selvaggi M; Van Haevermaet H; Van Mechelen P; Van Remortel N; Adler V; Beauceron S; Blyweert S; D'Hondt J; Devroede O; Kalogeropoulos A; Maes J; Maes M; Tavernier S; Van Doninck W; Van Mulders P; Villella I; Chabert EC; Charaf O; Clerbaux B; De Lentdecker G; Dero V; Gay APR; Hammad GH; Marage PE; Vander Velde C; Vanlaer P; Wickens J; Costantini S; Grunewald M; Klein B; Marinov A; Ryckbosch D; Thyssen F; Tytgat M; Vanelderen L; Verwilligen P; Walsh S; Zaganidis N; Basegmez S; Bruno G; Caudron J; De Favereau De Jeneret J; Delaere C; Demin P; Favart D; Giammanco A; Grégoire G; Hollar J; Lemaitre V; Militaru O; Ovyn S; Pagano D; Pin A; Piotrzkowski K; Quertenmont L
    We present a measurement of the ratio of positive to negative muon fluxes from cosmic ray interactions in the atmosphere, using data collected by the CMS detector both at ground level and in the underground experimental cavern at the CERN LHC. Muons were detected in the momentum range from 5 GeV/. c to 1 TeV/. c. The surface flux ratio is measured to be 1.2766±0.0032(stat.)±0.0032(syst.), independent of the muon momentum, below 100 GeV/. c. This is the most precise measurement to date. At higher momenta the data are consistent with an increase of the charge ratio, in agreement with cosmic ray shower models and compatible with previous measurements by deep-underground experiments. © 2010.
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    Measurement of the polarizations of prompt and non-prompt [Formula presented] and ψ(2S) mesons produced in pp collisions at s=13TeV
    (Elsevier B.V., 2024-10-04) Hayrapetyan A; Tumasyan A; Adam W; Andrejkovic JW; Bergauer T; Chatterjee S; Damanakis K; Dragicevic M; Hussain PS; Jeitler M; Krammer N; Li A; Liko D; Mikulec I; Schieck J; Schöfbeck R; Schwarz D; Sonawane M; Templ S; Waltenberger W; Wulz CE; Darwish MR; Janssen T; Van Laer T; Van Mechelen P; Breugelmans N; D'Hondt J; Dansana S; De Moor A; Delcourt M; Heyen F; Lowette S; Makarenko I; Müller D; Tavernier S; Tytgat M; Van Onsem GP; Van Putte S; Vannerom D; Bilin B; Clerbaux B; Das AK; De Lentdecker G; Evard H; Favart L; Gianneios P; Jaramillo J; Khalilzadeh A; Khan FA; Lee K; Mahdavikhorrami M; Malara A; Paredes S; Shahzad MA; Thomas L; Vanden Bemden M; Vander Velde C; Vanlaer P; De Coen M; Dobur D; Gokbulut G; Hong Y; Knolle J; Lambrecht L; Marckx D; Mota Amarilo K; Samalan A; Skovpen K; Van Den Bossche N; van der Linden J; Wezenbeek L; Benecke A; Bethani A; Bruno G; Caputo C; De Favereau De Jeneret J; Delaere C; Donertas IS; Giammanco A; Guzel AO; Jain S; Lemaitre V; Lidrych J; Mastrapasqua P; Tran TT; Wertz S; Alves GA; Alves Gallo Pereira M; Coelho E; Correia Silva G; Hensel C; Menezes De Oliveira T; Mora Herrera C; Moraes A; Rebello Teles P; Soeiro M; Vilela Pereira A; Aldá Júnior WL; Barroso Ferreira Filho M; Brandao Malbouisson H; Doser M
    The polarizations of prompt and non-prompt [Formula presented] and ψ(2S) mesons are measured in proton-proton collisions at s=13 TeV, using data samples collected by the CMS experiment in 2017 and 2018, corresponding to a total integrated luminosity of 103.3fb−1. Based on the analysis of the dimuon decay angular distributions in the helicity frame, the polar anisotropy, λϑ, is measured as a function of the transverse momentum, pT, of the charmonium states, in the 25–120 and 20–100 GeV ranges for the [Formula presented] and ψ(2S), respectively. The non-prompt polarizations agree with predictions based on the hypothesis that, for pT≳25GeV, the non-prompt [Formula presented] and ψ(2S) are predominantly produced in two-body B meson decays. The prompt results clearly exclude strong transverse polarizations, even for pT exceeding 30 times the [Formula presented] mass, where λϑ tends to an asymptotic value around 0.3. Taken together with previous measurements, by CMS and LHCb at s=7 TeV, the prompt polarizations show a significant variation with pT, at low pT.
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    Search for a resonance decaying to a W boson and a photon in proton-proton collisions at s = 13 TeV using leptonic W boson decays
    (Springer Nature, 2024-09-25) Hayrapetyan A; Tumasyan A; Adam W; Andrejkovic JW; Bergauer T; Chatterjee S; Damanakis K; Dragicevic M; Hussain PS; Jeitler M; Krammer N; Li A; Liko D; Mikulec I; Schieck J; Schöfbeck R; Schwarz D; Sonawane M; Templ S; Waltenberger W; Wulz CE; Janssen T; Van Laer T; Van Mechelen P; Breugelmans N; D’Hondt J; Dansana S; De Moor A; Delcourt M; Heyen F; Lowette S; Makarenko I; Müller D; Tavernier S; Tytgat M; Van Onsem GP; Van Putte S; Vannerom D; Bilin B; Clerbaux B; Das AK; De Lentdecker G; Evard H; Favart L; Gianneios P; Jaramillo J; Khalilzadeh A; Khan FA; Lee K; Mahdavikhorrami M; Malara A; Paredes S; Shahzad MA; Thomas L; Vanden Bemden M; Vander Velde C; Vanlaer P; De Coen M; Dobur D; Gokbulut G; Hong Y; Knolle J; Lambrecht L; Marckx D; Mota Amarilo K; Samalan A; Skovpen K; Van Den Bossche N; van der Linden J; Wezenbeek L; Benecke A; Bethani A; Bruno G; Caputo C; De Favereau De Jeneret J; Delaere C; Donertas IS; Giammanco A; Guzel AO; Jain S; Lemaitre V; Lidrych J; Mastrapasqua P; Tran TT; Wertz S; Alves GA; Alves Gallo Pereira M; Coelho E; Correia Silva G; Hensel C; Menezes De Oliveira T; Mora Herrera C; Moraes A; Rebello Teles P; Soeiro M; Vilela Pereira A; Aldá Júnior WL; Barroso Ferreira Filho M; Brandao Malbouisson H; Carvalho W
    A search for a new charged particle X with mass between 0.3 and 2.0 TeV decaying to a W boson and a photon is presented, using proton-proton collision data at a center-of-mass energy of 13 TeV, collected by the CMS experiment and corresponding to an integrated luminosity of 138 fb−1. Particle X has electric charge ±1 and is assumed to have spin 0. The search is performed using the electron and muon decays of the W boson. No significant excess above the predicted background is observed. The upper limit at 95% confidence level on the product of the production cross section of the X and its branching fraction to a W boson and a photon is found to be 94 (137) fb for a 0.3 TeV resonance and 0.75 (0.81) fb for a 2.0 TeV resonance, for an X width-to-mass ratio of 0.01% (5%). This search presents the most stringent constraints to date on the existence of such resonances across the probed mass range. A statistical combination with an earlier study based on the hadronic decay mode of the W boson is also performed, and the upper limit at 95% confidence level for a 2.0 TeV resonance is reduced to 0.50 (0.63) fb for an X width-to-mass ratio of 0.01% (5%).
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    Search for new phenomena in final states with two opposite-charge, same-flavor leptons, jets, and missing transverse momentum in pp collisions at √s=13 TeV
    (Springer Nature, 2018-03-13) Sirunyan AM; Tumasyan A; Adam W; Ambrogi F; Asilar E; Bergauer T; Brandstetter J; Brondolin E; Dragicevic M; Erö J; Flechl M; Friedl M; Frühwirth R; Ghete VM; Grossmann J; Hrubec J; Jeitler M; König A; Krammer N; Krätschmer I; Liko D; Madlener T; Mikulec I; Pree E; Rabady D; Rad N; Rohringer H; Schieck J; Schöfbeck R; Spanring M; Spitzbart D; Waltenberger W; Wittmann J; Wulz CE; Zarucki M; Chekhovsky V; Mossolov V; Suarez Gonzalez J; De Wolf EA; Di Croce D; Janssen X; Lauwers J; Van De Klundert M; Van Haevermaet H; Van Mechelen P; Van Remortel N; Abu Zeid S; Blekman F; D’Hondt J; De Bruyn I; De Clercq J; Deroover K; Flouris G; Lontkovskyi D; Lowette S; Moortgat S; Moreels L; Python Q; Skovpen K; Tavernier S; Van Doninck W; Van Mulders P; Van Parijs I; Brun H; Clerbaux B; De Lentdecker G; Delannoy H; Fasanella G; Favart L; Goldouzian R; Grebenyuk A; Karapostoli G; Lenzi T; Luetic J; Maerschalk T; Marinov A; Randle-conde A; Seva T; Vander Velde C; Vanlaer P; Vannerom D; Yonamine R; Zenoni F; Zhang F; Cimmino A; Cornelis T; Dobur D; Fagot A; Gul M; Khvastunov I; Poyraz D; Roskas C; Salva S; Tytgat M; Verbeke W; Zaganidis N; Bakhshiansohi H; Bondu O; Brochet S; Bruno G
    Search results are presented for physics beyond the standard model in final states with two opposite-charge, same-flavor leptons, jets, and missing transverse momentum. The data sample corresponds to an integrated luminosity of 35.9 fb−1 of proton-proton collisions at s=13 TeV collected with the CMS detector at the LHC in 2016. The analysis uses the invariant mass of the lepton pair, searching for a kinematic edge or a resonant-like excess compatible with the Z boson mass. The search for a kinematic edge targets production of particles sensitive to the strong force, while the resonance search targets both strongly and electroweakly produced new physics. The observed yields are consistent with the expectations from the standard model, and the results are interpreted in the context of simplified models of supersymmetry. In a gauge mediated supersymmetry breaking (GMSB) model of gluino pair production with decay chains including Z bosons, gluino masses up to 1500–1770 GeV are excluded at the 95% confidence level depending on the lightest neutralino mass. In a model of electroweak chargino-neutralino production, chargino masses as high as 610 GeV are excluded when the lightest neutralino is massless. In GMSB models of electroweak neutralino-neutralino production, neutralino masses up to 500-650 GeV are excluded depending on the decay mode assumed. Finally, in a model with bottom squark pair production and decay chains resulting in a kinematic edge in the dilepton invariant mass distribution, bottom squark masses up to 980–1200 GeV are excluded depending on the mass of the next-to-lightest neutralino.
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    Search for single production of vector-like quarks decaying to a b quark and a Higgs boson
    (Springer Nature, 2018-06-05) Sirunyan AM; Tumasyan A; Adam W; Ambrogi F; Asilar E; Bergauer T; Brandstetter J; Brondolin E; Dragicevic M; Erö J; Escalante Del Valle A; Flechl M; Friedl M; Frühwirth R; Ghete VM; Grossmann J; Hrubec J; Jeitler M; König A; Krammer N; Krätschmer I; Liko D; Madlener T; Mikulec I; Pree E; Rad N; Rohringer H; Schieck J; Schöfbeck R; Spanring M; Spitzbart D; Taurok A; Waltenberger W; Wittmann J; Wulz CE; Zarucki M; Chekhovsky V; Mossolov V; Suarez Gonzalez J; De Wolf EA; Di Croce D; Janssen X; Lauwers J; Van De Klundert M; Van Haevermaet H; Van Mechelen P; Van Remortel N; Abu Zeid S; Blekman F; D’Hondt J; De Bruyn I; De Clercq J; Deroover K; Flouris G; Lontkovskyi D; Lowette S; Marchesini I; Moortgat S; Moreels L; Python Q; Skovpen K; Tavernier S; Van Doninck W; Van Mulders P; Van Parijs I; Beghin D; Bilin B; Brun H; Clerbaux B; De Lentdecker G; Delannoy H; Dorney B; Fasanella G; Favart L; Goldouzian R; Grebenyuk A; Kalsi AK; Lenzi T; Luetic J; Maerschalk T; Marinov A; Seva T; Starling E; Vander Velde C; Vanlaer P; Vannerom D; Yonamine R; Zenoni F; Cornelis T; Dobur D; Fagot A; Gul M; Khvastunov I; Poyraz D; Roskas C; Salva S; Trocino D; Tytgat M; Verbeke W; Vit M
    A search is presented for single production of heavy vector-like quarks (B) that decay to a Higgs boson and a b quark, with the Higgs boson decaying to a highly boosted b b ¯ pair reconstructed as a single collimated jet. The analysis is based on data collected by the CMS experiment in proton-proton collisions at s=13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. The data are consistent with background expectations, and upper limits at 95% confidence level on the product of the B quark cross section and the branching fraction are obtained in the range 1.28–0.07 pb, for a narrow B quark with a mass between 700 and 1800 GeV. The production of B quarks with widths of 10, 20 and 30% of the resonance mass is also considered, and the sensitivities obtained are similar to those achieved in the narrow width case. This is the first search at the CERN LHC for the single production of a B quark through its fully hadronic decay channel, and the first study considering finite resonance widths of the B quark.
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    Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at square root of s = 7 TeV.
    (AMER PHYSICAL SOC, 9/07/2010) Khachatryan V; Sirunyan AM; Tumasyan A; Adam W; Bergauer T; Dragicevic M; Erö J; Fabjan C; Friedl M; Frühwirth R; Ghete VM; Hammer J; Hänsel S; Hoch M; Hörmann N; Hrubec J; Jeitler M; Kasieczka G; Kiesenhofer W; Krammer M; Liko D; Mikulec I; Pernicka M; Rohringer H; Schöfbeck R; Strauss J; Taurok A; Teischinger F; Waltenberger W; Walzel G; Widl E; Wulz C-E; Mossolov V; Shumeiko N; Suarez Gonzalez J; Benucci L; Ceard L; De Wolf EA; Hashemi M; Janssen X; Maes T; Mucibello L; Ochesanu S; Roland B; Rougny R; Selvaggi M; Van Haevermaet H; Van Mechelen P; Van Remortel N; Adler V; Beauceron S; Blyweert S; D'Hondt J; Devroede O; Kalogeropoulos A; Maes J; Maes M; Tavernier S; Van Doninck W; Van Mulders P; Villella I; Chabert EC; Charaf O; Clerbaux B; De Lentdecker G; Dero V; Gay APR; Hammad GH; Marage PE; Vander Velde C; Vanlaer P; Wickens J; Costantini S; Grunewald M; Klein B; Marinov A; Ryckbosch D; Thyssen F; Tytgat M; Vanelderen L; Verwilligen P; Walsh S; Zaganidis N; Basegmez S; Bruno G; Caudron J; De Favereau De Jeneret J; Delaere C; Demin P; Favart D; Giammanco A; Grégoire G; Hollar J; Lemaitre V; Militaru O; Ovyn S; Pagano D; Pin A; Piotrzkowski K; Quertenmont L; Schul N; Beliy N; Caebergs T; Daubie E; Alves GA; Pol ME; Souza MHG; Carvalho W; Da Costa EM; De Jesus Damiao D; De Oliveira Martins C; Fonseca De Souza S; Mundim L; Oguri V; Santoro A; Silva Do Amaral SM; Sznajder A; Torres Da Silva De Araujo F; Dias FA; Dias MAF; Fernandez Perez Tomei TR; Gregores EM; Marinho F; Novaes SF; Padula SS; Darmenov N; Dimitrov L; Genchev V; Iaydjiev P; Piperov S; Stoykova S; Sultanov G; Trayanov R; Vankov I; Dyulendarova M; Hadjiiska R; Kozhuharov V; Litov L; Marinova E; Mateev M; Pavlov B; Petkov P; Bian JG; Chen GM; Chen HS; Jiang CH; Liang D; Liang S; Wang J; Wang J; Wang X; Wang Z; Yang M; Zang J; Zhang Z; Ban Y; Guo S; Hu Z; Mao Y; Qian SJ; Teng H; Zhu B; Cabrera A; Carrillo Montoya CA; Gomez Moreno B; Ocampo Rios AA; Osorio Oliveros AF; Sanabria JC; Godinovic N; Lelas D; Lelas K; Plestina R; Polic D; Puljak I; Antunovic Z; Dzelalija M; Brigljevic V; Duric S; Kadija K; Morovic S; Attikis A; Fereos R; Galanti M; Mousa J; Nicolaou C; Papadakis A; Ptochos F; Razis PA; Rykaczewski H; Tsiakkouri D; Zinonos Z; Mahmoud M; Hektor A; Kadastik M; Kannike K; Müntel M; Raidal M; Rebane L; Azzolini V; Eerola P; Czellar S; Härkönen J; Heikkinen A; Karimäki V; Kinnunen R; Klem J; Kortelainen MJ; Lampén T; Lassila-Perini K; Lehti S; Lindén T; Luukka P; Mäenpää T; Tuominen E; Tuominiemi J; Tuovinen E; Ungaro D; Wendland L; Banzuzi K; Korpela A; Tuuva T; Sillou D; Besancon M; Dejardin M; Denegri D; Descamps J; Fabbro B; Faure JL; Ferri F; Ganjour S; Gentit FX; Givernaud A; Gras P; Hamel de Monchenault G; Jarry P; Locci E; Malcles J; Marionneau M; Millischer L; Rander J; Rosowsky A; Rousseau D; Titov M; Verrecchia P; Baffioni S; Bianchini L; Bluj M; Broutin C; Busson P; Charlot C; Dobrzynski L; Elgammal S; Granier de Cassagnac R; Haguenauer M; Kalinowski A; Miné P; Paganini P; Sabes D; Sirois Y; Thiebaux C; Zabi A; Agram J-L; Besson A; Bloch D; Bodin D; Brom J-M; Cardaci M; Conte E; Drouhin F; Ferro C; Fontaine J-C; Gelé D; Goerlach U; Greder S; Juillot P; Karim M; Le Bihan A-C; Mikami Y; Speck J; Van Hove P; Fassi F; Mercier D; Baty C; Beaupere N; Bedjidian M; Bondu O; Boudoul G; Boumediene D; Brun H; Chanon N; Chierici R; Contardo D; Depasse P; El Mamouni H; Fay J; Gascon S; Ille B; Kurca T; Le Grand T; Lethuillier M; Mirabito L; Perries S; Tosi S; Tschudi Y; Verdier P; Xiao H; Roinishvili V; Anagnostou G; Edelhoff M; Feld L; Heracleous N; Hindrichs O; Jussen R; Klein K; Merz J; Mohr N; Ostapchuk A; Perieanu A; Raupach F; Sammet J; Schael S; Sprenger D; Weber H; Weber M; Wittmer B; Actis O; Ata M; Bender W; Biallass P; Erdmann M; Frangenheim J; Hebbeker T; Hinzmann A; Hoepfner K; Hof C; Kirsch M; Klimkovich T; Kreuzer P; Lanske D; Magass C; Merschmeyer M; Meyer A; Papacz P; Pieta H; Reithler H; Schmitz SA; Sonnenschein L; Sowa M; Steggemann J; Teyssier D; Zeidler C; Bontenackels M; Davids M; Duda M; Flügge G; Geenen H; Giffels M; Haj Ahmad W; Heydhausen D; Kress T; Kuessel Y; Linn A; Nowack A; Perchalla L; Pooth O; Sauerland P; Stahl A; Thomas M; Tornier D; Zoeller MH; Aldaya Martin M; Behrenhoff W; Behrens U; Bergholz M; Borras K; Campbell A; Castro E; Dammann D; Eckerlin G; Flossdorf A; Flucke G; Geiser A; Hauk J; Jung H; Kasemann M; Katkov I; Kleinwort C; Kluge H; Knutsson A; Kuznetsova E; Lange W; Lohmann W; Mankel R; Marienfeld M; Melzer-Pellmann I-A; Meyer AB; Mnich J; Mussgiller A; Olzem J; Parenti A; Raspereza A; Schmidt R; Schoerner-Sadenius T; Sen N; Stein M; Tomaszewska J; Volyanskyy D; Wissing C; Autermann C; Draeger J; Eckstein D; Enderle H; Gebbert U; Kaschube K; Kaussen G; Klanner R; Mura B; Naumann-Emme S; Nowak F; Sander C; Schettler H; Schleper P; Schröder M; Schum T; Schwandt J; Stadie H; Steinbrück G; Thomsen J; Wolf R; Bauer J; Buege V; Cakir A; Chwalek T; Daeuwel D; De Boer W; Dierlamm A; Dirkes G; Feindt M; Gruschke J; Hackstein C; Hartmann F; Heinrich M; Held H; Hoffmann KH; Honc S; Kuhr T; Martschei D; Mueller S; Müller T; Niegel M; Oberst O; Oehler A; Ott J; Peiffer T; Piparo D; Quast G; Rabbertz K; Ratnikov F; Renz M; Sabellek A; Saout C; Scheurer A; Schieferdecker P; Schilling F-P; Schott G; Simonis HJ; Stober FM; Troendle D; Wagner-Kuhr J; Zeise M; Zhukov V; Ziebarth EB; Daskalakis G; Geralis T; Kyriakis A; Loukas D; Manolakos I; Markou A; Markou C; Mavrommatis C; Petrakou E; Gouskos L; Katsas P; Panagiotou A; Evangelou I; Kokkas P; Manthos N; Papadopoulos I; Patras V; Triantis FA; Aranyi A; Bencze G; Boldizsar L; Debreczeni G; Hajdu C; Horvath D; Kapusi A; Krajczar K; Laszlo A; Sikler F; Vesztergombi G; Beni N; Molnar J; Palinkas J; Szillasi Z; Veszpremi V; Raics P; Trocsanyi ZL; Ujvari B; Bansal S; Beri SB; Bhatnagar V; Jindal M; Kaur M; Kohli JM; Mehta MZ; Nishu N; Saini LK; Sharma A; Sharma R; Singh AP; Singh JB; Singh SP; Ahuja S; Bhattacharya S; Chauhan S; Choudhary BC; Gupta P; Jain S; Jain S; Kumar A; Ranjan K; Shivpuri RK; Choudhury RK; Dutta D; Kailas S; Kataria SK; Mohanty AK; Pant LM; Shukla P; Suggisetti P; Aziz T; Guchait M; Gurtu A; Maity M; Majumder D; Majumder G; Mazumdar K; Mohanty GB; Saha A; Sudhakar K; Wickramage N; Banerjee S; Dugad S; Mondal NK; Arfaei H; Bakhshiansohi H; Fahim A; Jafari A; Mohammadi Najafabadi M; Paktinat Mehdiabadi S; Safarzadeh B; Zeinali M; Abbrescia M; Barbone L; Colaleo A; Creanza D; De Filippis N; De Palma M; Dimitrov A; Fedele F; Fiore L; Iaselli G; Lusito L; Maggi G; Maggi M; Manna N; Marangelli B; My S; Nuzzo S; Pierro GA; Pompili A; Pugliese G; Romano F; Roselli G; Selvaggi G; Silvestris L; Trentadue R; Tupputi S; Zito G; Abbiendi G; Benvenuti AC; Bonacorsi D; Braibant-Giacomelli S; Castro A; Cavallo FR; Codispoti G; Dallavalle GM; Fabbri F; Fanfani A; Fasanella D; Giacomelli P; Giunta M; Grandi C; Marcellini S; Masetti G; Montanari A; Navarria FL; Odorici F; Perrotta A; Rossi AM; Rovelli T; Siroli G; Travaglini R; 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CMS Collaboration
    Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at square root of 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 dN(ch)/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 square root of s = 0.9 to 7 TeV is [66.1 ± 1.0(stat) ± 4.2(syst)]%. The mean transverse momentum is measured to be 0.545 ± 0.005(stat) ± 0.015(syst)  GeV/c. The results are compared with similar measurements at lower energies.
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    Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at √s = 0.9 and 2.36TeV
    (SPRINGER, 1/01/2010) Khachatryan V; Sirunyan AM; Tumasyan A; Adam W; Bergauer T; Dragicevic M; Erö J; Friedl M; Frühwirth R; Ghete VM; Hammer J; Hänsel S; Hoch M; Hörmann N; Hrubec J; Jeitler M; Kasieczka G; Krammer M; Liko D; Mikulec I; Pernicka M; Rohringer H; Schöfbeck R; Strauss J; Taurok A; Teischinger F; Waltenberger W; Walzel G; Widl E; Wulz CE; Mossolov V; Shumeiko N; Suarez Gonzalez J; Benucci L; De Wolf EA; Hashemi M; Janssen X; Maes T; Mucibello L; Ochesanu S; Rougny R; Selvaggi M; Van Haevermaet H; Van Mechelen P; Van Remortel N; Adler V; Beauceron S; D’Hondt J; Devroede O; Kalogeropoulos A; Maes J; Mozer MU; Tavernier S; Van Doninck W; Van Mulders P; Villella I; Chabert EC; Charaf O; Clerbaux B; De Lentdecker G; Dero V; Gay APR; Hammad GH; Marage PE; Vander Velde C; Vanlaer P; Wickens J; Grunewald M; Klein B; Marinov A; Ryckbosch D; Thyssen F; Tytgat M; Vanelderen L; Verwilligen P; Walsh S; Basegmez S; Bruno G; Caudron J; Cortina Gil E; De Favereau De Jeneret J; Delaere C; Demin P; Favart D; Giammanco A; Grégoire G; Hollar J; Lemaitre V; Maltoni F; Militaru O; Ovyn S; Piotrzkowski K; Quertenmont L; Schul N; Beliy N; Caebergs T; Daubie E; Herquet P; Alves GA; Pol ME
    Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at √s = 0.9 and 2.36 TeV. The data were collected with the CMS detector during the LHC commissioning in December 2009. For non-single-diffractive interactions, the average charged-hadron transverse momentum is measured to be 0:46 ± 0:01 (stat.) ± 0.01 (syst.) GeV/c at 0.9 TeV and 0:50 ± 0:01 (stat.) ± 0.01 (syst.) GeV/c at 2.36 TeV, for pseudorapidities between -2:4 and +2:4. At these energies, the measured pseudorapidity densities in the central region, dNch/dη| |η|>0.5, are 3:48±0:02 (stat.) ± 0.13 (syst.) and 4:47±0:04 (stat.) ± 0.16 (syst.), respectively. The results at 0.9 TeV are in agreement with previous measurements and con- firm the expectation of near equal hadron production in pp̄ and pp collisions. The results at 2.36 TeV represent the highest-energy measurements at a particle collider to date.