First proton-proton collisions at the LHC as observed with the ALICE detector: measurement of the charged-particle pseudorapidity density at root s=900 GeV
DSpace at IIT Bombay
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Title |
First proton-proton collisions at the LHC as observed with the ALICE detector: measurement of the charged-particle pseudorapidity density at root s=900 GeV
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Creator |
AAMODT, K
ABEL, N ABEYSEKARA, U QUINTANA, AA ACERO, A ADAMOVA, D AGGARWAL, MM RINELLA, GA AGOCS, AG SALAZAR, SA AHAMMED, Z BLANCO, F VRLAKOVA, J VULPESCU, B WAGNER, B WAGNER, V WALLET, L WAN, R WANG, D WANG, Y WANG, Y WATANABE, K BLAU, D WEN, Q WESSELS, J WIECHULA, J WIKNE, J WILK, A WILK, G WILLIAMS, MCS WILLIS, N WINDELBAND, B XU, C BLUME, C YANG, C YANG, H YASNOPOLSKY, A YERMIA, F YI, J YIN, Z YOKOYAMA, H YOO, IK YUAN, X YUSHMANOV, I BOCCIOLI, M ZABRODIN, E ZAGREEV, B ZALITE, A ZAMPOLLI, C ZANEVSKY, Y ZAPOROZHETS, S ZAROCHENTSEV, A ZAVADA, P ZBROSZCZYK, H ZELNICEK, P BOCK, N ZENIN, A ZEPEDA, A ZGURA, I ZHALOV, M ZHANG, X ZHOU, D ZHOU, S ZHOU, S ZHU, J ZICHICHI, A BOGDANOV, A ZINCHENKO, A ZINOVJEV, G ZINOVJEV, M ZOCCARATO, Y ZYCHACEK, V BOGGILD, H BOGOLYUBSKY, M BOHM, J BOLDIZSAR, L AHMAD, A BOMBARA, M BOMBONATI, C BONDILA, M BOREL, H BORSHCHOV, V BORTOLIN, C BOSE, S BOSISIO, L BOSSU, F BOTJE, M AHMAD, N BOTTGER, S BOURDAUD, G BOYER, B BRAUN, M BRAUN-MUNZINGER, P BRAVINA, L BREGANT, M BREITNER, T BRUCKNER, G BRUN, R AHN, SU BRUNA, E BRUNO, GE BUDNIKOV, D BUESCHING, H BUGAEV, K BUNCIC, P BUSCH, O BUTHELEZI, Z CAFFARRI, D CAI, X AKIMOTO, R CAINES, H CAMACHO, E CAMERINI, P CAMPBELL, M ROMAN, VC CAPITANI, GP ROMEO, GC CARENA, F CARENA, W CARMINATI, F AKINDINOV, A DIAZ, AC CASELLE, M CASTELLANOS, JC HERNANDEZ, JFC CATANESCU, V CATTARUZZA, E CAVICCHIOLI, C CERELLO, P CHAMBERT, V CHANG, B ALEKSANDROV, D CHAPELAND, S CHARPY, A CHARVET, JL CHATTOPADHYAY, S CHATTOPADHYAY, S CHERNEY, M CHESHKOV, C CHEYNIS, B CHIAVASSA, E BARROSO, VC ALESSANDRO, B CHINELLATO, DD CHOCHULA, P CHOI, K CHOJNACKI, M CHRISTAKOGLOU, P CHRISTENSEN, CH CHRISTIANSEN, P CHUJO, T CHUMAN, F CICALO, C MOLINA, RA CIFARELLI, L CINDOLO, F CLEYMANS, J COBANOGLU, O COFFIN, JP COLI, S COLLA, A BALBASTRE, GC DEL VALLE, ZC CONNER, ES ALICI, A CONSTANTIN, P CONTIN, G CONTRERAS, JG MORALES, YC CORMIER, TM CORTESE, P MALDONADO, IC COSENTINO, MR COSTA, F COTALLO, ME AVINA, EA CRESCIO, E CROCHET, P CUAUTLE, E CUNQUEIRO, L CUSSONNEAU, J DAINESE, A DALSGAARD, HH DANU, A DAS, I DAS, S ALME, J DASH, A DASH, S DE BARROS, GOV DE CARO, A DE CATALDO, G DE CUVELAND, J DE FALCO, A DE GASPARI, M DE GROOT, J DE GRUTTOLA, D ALT, T DE HAAS, AP DE MARCO, N DE ROOIJ, R DE PASQUALE, S DE VAUX, G DELAGRANGE, H DELLACASA, G DELOFF, A DEMANOV, V DENES, E ALTINI, V DEPPMAN, A D'ERASMO, G DERKACH, D DEVAUX, A DI BARI, D DI GIGLIO, C DI LIBERTO, S DI MAURO, A DI NEZZA, P DIALINAS, M ALTINPINAR, S DIAZ, L DIAZ, R DIETEL, T DING, H DIVIA, R DJUVSLAND, O VALDIVIESSO, GD DOBRETSOV, V DOBRIN, A DOBROWOLSKI, T ANDREI, C DONIGUS, B DOMINGUEZ, I DON, DMM DORDIC, O DUBEY, AK DUBUISSON, J DUCROUX, L DUPIEUX, P MAJUMDAR, AKD MAJUMDAR, MRD ANDRONIC, A ELIA, D EMSCHERMANN, D ENOKIZONO, A ESPAGNON, B ESTIENNE, M EVANS, D EVRARD, S EYYUBOVA, G FABJAN, CW FABRIS, D ANELLI, G FAIVRE, J FALCHIERI, D FANTONI, A FASEL, M FEARICK, R FEDUNOV, A FEHLKER, D FEKETE, V FELEA, D FENTON-OLSEN, B ANGELOV, V FEOFILOV, G TELLEZ, AF FERREIRO, EG FERRETTI, A FERRETTI, R FIGUEREDO, MAS FILCHAGIN, S FINI, R FIONDA, FM FIORE, EM ANSON, C FLORIS, M FODOR, Z FOERTSCH, S FOKA, P FOKIN, S FORMENTI, F FRAGIACOMO, E FRAGKIADAKIS, M FRANKENFELD, U FROLOV, A ANTICIC, T FUCHS, U FURANO, F FURGET, C GIRARD, MF GAARDHOJE, JJ GADRAT, S GAGLIARDI, M GAGO, A GALLIO, M GANOTI, P ANTINORI, F GANTI, MS GARABATOS, C TRAPAGA, CG GEBELEIN, J GEMME, R GERMAIN, M GHEATA, A GHEATA, M GHIDINI, B GHOSH, P ANTINORI, S GIRAUDO, G GIUBELLINO, P GLADYSZ-DZIADUS, E GLASOW, R GLASSEL, P GLENN, A GOMEZ, R SANTOS, HG GONZALEZ-TRUEBA, LH GONZALEZ-ZAMORA, P ANTIPIN, K GORBUNOV, S GORBUNOV, Y GOTOVAC, S GOTTSCHLAG, H GRABSKI, V GRAJCAREK, R GRELLI, A GRIGORAS, A GRIGORAS, C GRIGORIEV, V ANTONCZYK, D GRIGORYAN, A GRINYOV, B GRION, N GROS, P GROSSE-OETRINGHAUS, JF GROSSIORD, JY GROSSO, R GUARNACCIA, C GUBER, F GUERNANE, R ANTONIOLI, P GUERZONI, B GULBRANDSEN, K GULKANYAN, H GUNJI, T GUPTA, A GUPTA, R GUSTAFSSON, HA GUTBROD, H HAALAND, O HADJIDAKIS, C ANZO, A HAIDUC, M HAMAGAKI, H HAMAR, G HAMBLEN, J HAN, BH HARRIS, JW HARTIG, M HARUTYUNYAN, A HASCH, D HASEGAN, D APHECETCHE, L HATZIFOTIADOU, D HAYRAPETYAN, A HEIDE, M HEINZ, M HELSTRUP, H HERGHELEGIU, A HERNANDEZ, C CORRAL, GG HERRMANN, N HETLAND, KF APPELSHAUSER, H HICKS, B HIEI, A HILLE, P HIPPOLYTE, B HORAGUCHI, T HORI, Y HRISTOV, P HRIVNACOVA, I HU, S HUBER, S ARCELLI, S HUMANIC, TJ HUTTER, D HWANG, DS ICHOU, R ILKAEV, R ILKIV, I INNOCENTI, PG IPPOLITOV, M IRFAN, M IVAN, C ARCEO, R IVANOV, A IVANOV, M IVANOV, V IWASAKI, T JACHOKOWSKI, A JACOBS, PM JANCUROVA, L JANGAL, S JANIK, R JAYANANDA, K AREND, A JENA, C JENA, S JIRDEN, L JONES, G JONES, PG JOVANOVIC, P JUNG, H JUNG, W JUSKO, A KAIDALOV, AB ARMESTO, N KALCHER, S KALINAK, P KALLIOKOSKI, T KALWEIT, A KAMAL, A KAMERMANS, R KANAKI, K KANG, E KANG, JH KAPITAN, J ARNALDI, R KAPLIN, V KAPUSTA, S KARAVICHEVA, T KARPECHEV, E KAZANTSEV, A KEBSCHULL, U KEIDEL, R KHAN, MM KHAN, SA KHANZADEEV, A ARONSSON, T KHARLOV, Y KIKOLA, D KILENG, B KIM, DJ KIM, DS KIM, DW KIM, HN KIM, J KIM, JH KIM, JS ARSENE, IC KIM, M KIM, M KIM, SH KIM, S KIM, Y KIRSCH, S KISEL, I KISELEV, S KISIEL, A KLAY, JL ASRYAN, A KLEIN, J KLEIN-BOSING, C KLIEMANT, M KLOVNING, A KLUGE, A KNIEGE, S KOCH, K KOLEVATOV, R KOLOJVARI, A KONDRATIEV, V AUGUSTINUS, A KONDRATYEVA, N KONEVSKIH, A KORNAS, E KOUR, R KOWALSKI, M KOX, S KOZLOV, K KRAL, J KRALIK, I KRAMER, F AVERBECK, R KRAUS, I KRAVCAKOVA, A KRAWUTSCHKE, T KRIVDA, M KRUMBHORN, D KRUS, M KRYSHEN, E KRZEWICKI, M KUCHERIAEV, Y KUHN, C AWES, TC KUIJER, PG KUMAR, L KUMAR, N KUPCZAK, R KURASHVILI, P KUREPIN, A KUREPIN, AN KURYAKIN, A KUSHPIL, S KUSHPIL, V AYSTO, J KUTOUSKI, M KVAERNO, H KWEON, MJ KWON, Y LA ROCCA, P LACKNER, F DE GUEVARA, PL LAFAGE, V LAL, C LARA, C AZMI, MD LARSEN, DT LAURENTI, G LAZZERONI, C LE BORNEC, Y LE BRIS, N LEE, H LEE, KS LEE, SC LEFEVRE, F LENHARDT, M BABLOK, S LEISTAM, L LEHNERT, J LENTI, V LEON, H MONZON, IL VARGAS, HL LEVAI, P LI, Y LIETAVA, R LINDAL, S BACH, M LINDENSTRUTH, V LIPPMANN, C LISA, MA LISTRATENKO, O LIU, L LOGINOV, V LOHN, S LOPEZ, X NORIEGA, ML LOPEZ-RAMIREZ, R BADALA, A TORRES, EL LOVHOIDEN, G SOARES, ALF LU, S LUNARDON, M LUPARELLO, G LUQUIN, L LUTZ, JR LUVISETTO, M MA, K BAEK, YW MA, R MADAGODAHETTIGE-DON, DM MAEVSKAYA, A MAGER, M MAHAJAN, A MAHAPATRA, DP MAIRE, A MAKHLYUEVA, I MAL'KEVICH, D MALAEV, M BAGNASCO, S CERVANTES, IM MALEK, M MALKIEWICZ, T MALZACHER, P MAMONOV, A MANCEAU, L MANGOTRA, L MANKO, V MANSO, F MANZARI, V BAILHACHE, R MAO, Y MARES, J MARGAGLIOTTI, GV MARGOTTI, A MARIN, A MARTASHVILI, I MARTINENGO, P MARTINEZ, MI DAVALOS, AM GARCIA, GM BALA, R MARUYAMA, Y CHIESA, AM MASCIOCCHI, S MASERA, M MASETTI, M MASONI, A MASSACRIER, L MASTROMARCO, M MASTROSERIO, A MATTHEWS, ZL BALDISSERI, A TAVARES, BM MATYJA, A MAYANI, D MAZZA, G MAZZONI, MA MEDDI, F MENCHACA-ROCHA, A LORENZO, PM MEONI, M PEREZ, JM BALDIT, A MEREU, P MIAKE, Y MICHALON, A MIFTAKHOV, N MILOSEVIC, J MINAFRA, F MISCHKE, A MISKOWIEC, D MITU, C MIZOGUCHI, K BAN, J MLYNARZ, J MOHANTY, B MOLNAR, L MONDAL, MM ZETINA, LM MONTENO, M MONTES, E MORANDO, M MORETTO, S MORSCH, A BARBERA, R MOUKHANOVA, T MUCCIFORA, V MUDNIC, E MUHURI, S MULLER, H MUNHOZ, MG MUNOZ, J MUSA, L MUSSO, A NANDI, BK BARNAFOLDI, GG NANIA, R NAPPI, E NAVACH, F NAVIN, S NAYAK, TK NAZARENKO, S NAZAROV, G NEDOSEKIN, A NENDAZ, F NEWBY, J BARNBY, L NIANINE, A NICASSIO, M NIELSEN, BS NIKOLAEV, S NIKOLIC, V NIKULIN, S NIKULIN, V NILSEN, B NILSSON, MS NOFERINI, F BARRET, V NOMOKONOV, P NOOREN, G NOVITZKY, N NYATHA, A NYGAARD, C NYIRI, A NYSTRAND, J OCHIROV, A ODYNIEC, G OESCHLER, H BARTKE, J OINONEN, M OKADA, K OKADA, Y OLDENBURG, M OLENIACZ, J OPPEDISANO, C ORSINI, F VELAZQUEZ, A ORTONA, G OSKAMP, C BARILE, F OSKARSSON, A OSMIC, F OSTERMAN, L OSTROWSKI, P OTTERLUND, I OTWINOWSKI, J OVREBEKK, G OYAMA, K OZAWA, K PACHMAYER, Y BASILE, M PACHR, M PADILLA, F PAGANO, P PAIC, G PAINKE, F PAJARES, C PAL, S PAL, SK PALAHA, A PALMERI, A BASMANOV, V PANSE, R PAPPALARDO, GS PARK, WJ PASTIRCAK, B PASTORE, C PATICCHIO, V PAVLINOV, A PAWLAK, T PEITZMANN, T PEPATO, A BASTID, N PEREIRA, H PERESSOUNKO, D PEREZ, C PERINI, D PERRINO, D PERYT, W PESCHEK, J PESCI, A PESKOV, V PESTOV, Y BATHEN, B PETERS, A PETRACEK, V PETRIDIS, A PETRIS, M PETROV, P PETROVICI, M PETTA, C PEYRE, J PIANO, S PICCOTTI, A BATIGNE, G PIKNA, M PILLOT, P PINSKY, L PITZ, N PIUZ, F PLATT, R PLOSKON, M PLUTA, J POCHEPTSOV, T POCHYBOVA, S BATYUNYA, B LERMA, PLM POGGIO, F POGHOSYAN, MG POLAK, K POLICHTCHOUK, B POLOZOV, P POLYAKOV, V POMMERESCH, B POP, A POSA, F BAUMANN, C POSPISIL, V POTUKUCHI, B POUTHAS, J PRASAD, SK PREGHENELLA, R PRINO, F PRUNEAU, CA PSHENICHNOV, I PUDDU, G PUJAHARI, P BEARDEN, I PULVIRENTI, A PUNIN, A PUNIN, V PUTIS, M PUTSCHKE, J QUERCIGH, E RACHEVSKI, A RADEMAKERS, A RADOMSKI, S RAIHA, T BECKER, B RAK, J RAKOTOZAFINDRABE, A RAMELLO, L REYES, AR RAMMLER, M RANIWALA, R RANIWALA, S RASANEN, S RASHEVSKAYA, I RATH, S BELIKOV, I READ, KF REAL, J REDLICH, K RENFORDT, R REOLON, AR RESHETIN, A RETTIG, F REVOL, JP REYGERS, K RICAUD, H BELLWIED, R RICCATI, L RICCI, RA RICHTER, M RIEDLER, P RIEGLER, W RIGGI, F RIVETTI, A CAHUANTZI, MR ROED, K ROHRICH, D BELMONT-MORENO, E LOPEZ, SR ROMITA, R RONCHETTI, F ROSINSKY, P ROSNET, P ROSSEGGER, S ROSSI, A ROUKOUTAKIS, F ROUSSEAU, S ROY, C BELOGIANNI, A ROY, P RUBIO-MONTERO, AJ RUI, R RUSANOV, I RUSSO, G RYABINKIN, E RYBICKI, A SADOVSKY, S SAFARIK, K SAHOO, R BENHABIB, L SAINI, J SAIZ, P SAKATA, D SALGADO, CA DA SILVA, RSD SALUR, S SAMANTA, T SAMBYAL, S SAMSONOV, V SANDOR, L BEOLE, S SANDOVAL, A SANO, M SANO, S SANTO, R SANTORO, R SARKAMO, J SATURNINI, P SCAPPARONE, E SCARLASSARA, F SCHARENBERG, RP BERCEANU, I SCHIAUA, C SCHICKER, R SCHINDLER, H SCHMIDT, C SCHMIDT, HR SCHREINER, S SCHUCHMANN, S SCHUKRAFT, J SCHUTZ, Y SCHWARZ, K BERCUCI, A SCHWEDA, K SCIOLI, G SCOMPARIN, E SEGATO, G SEMENOV, D SENYUKOV, S SEO, J SERCI, S SERKIN, L SERRADILLA, E BERDERMANN, E SEVCENCO, A SGURA, I SHABRATOVA, G SHAHOYAN, R SHARKOV, G SHARMA, N SHARMA, S SHIGAKI, K SHIMOMURA, M SHTEJER, K BERDNIKOV, Y SIBIRIAK, Y SICILIANO, M SICKING, E SIDDI, E SIEMIARCZUK, T SILENZI, A SILVERMYR, D SIMILI, E SIMONETTI, G SINGARAJU, R BETEV, L SINGH, R SINGHAL, V SINHA, BC SINHA, T SITAR, B SITTA, M SKAALI, TB SKJERDAL, K SMAKAL, R SMIRNOV, N BHASIN, A SNELLINGS, R SNOW, H SOGAARD, C SOKOLOV, O SOLOVIEV, A SOLTVEIT, HK SOLTZ, R SOMMER, W SON, CW SON, HS BHATI, AK SONG, M SOOS, C SORAMEL, F SOYK, D SPYROPOULOU-STASSINAKI, M SRIVASTAVA, BK STACHEL, J STALEY, F STAN, I STEFANEK, G BIANCHI, L STEFANINI, G STEINBECK, T STENLUND, E STEYN, G STOCCO, D STOCK, R STOLPOVSKY, P STRMEN, P SUAIDE, AAP VASQUEZ, MAS BIANCHI, N SUGITATE, T SUIRE, C SUMBERA, M SUSA, T SWOBODA, D SYMONS, TJM DE TOLEDO, AS SZARKA, I SZOSTAK, A SZUBA, M BIANCHIN, C TADEL, M TAGRIDIS, C TAKAHARA, A TAKAHASHI, J TANABE, R TAKAKI, JDT TAUREG, H TAURO, A TAVLET, M MUNOZ, G BIELCIK, J TELESCA, A TERREVOLI, C THADER, J TIEULENT, R TLUSTY, D TOIA, A TOLYHY, T DE MATOS, CT TORII, H TORRALBA, G BIELCIKOVA, J TOSCANO, L TOSELLO, F TOURNAIRE, A TRACZYK, T TRIBEDY, P TROGER, G TRUESDALE, D TRZASKA, WH TSILEDAKIS, G TSILIS, E BILANDZIC, A TSUJI, T TUMKIN, A TURRISI, R TURVEY, A TVETER, TS TYDESJO, H TYWONIUK, K ULERY, J ULLALAND, K URAS, A BIMBOT, L URBAN, J URCIUOLI, GM USAI, GL VACCHI, A VALA, M PALOMO, LV VALLERO, S VAN DEN BRINK, A VAN DER KOLK, N VYVRE, PV BIOLCATI, E VAN LEEUWEN, M VANNUCCI, L VARGAS, A VARMA, R VASILIEV, A VASSILIEV, I VASSILIOU, M VECHERNIN, V VENARUZZO, M VERCELLIN, E BLANC, A VERGARA, S VERNET, R VERWEIJ, M VETLITSKIY, I VICKOVIC, L VIESTI, G VIKHLYANTSEV, O VILAKAZI, Z BAILLIE, OV VINOGRADOV, A BLANCO, F VINOGRADOV, L VINOGRADOV, Y VIRGILI, T VIYOGI, YP VODOPIANOV, A VOLOSHIN, K VOLOSHIN, S VOLPE, G VON HALLER, B VRANIC, D |
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Subject |
dual-parton model
quark-gluon strings high-energies multiplicity distributions multihadron production hadron interactions pp interactions cm energies 0.9 tev physics |
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Description |
On 23rd November 2009, during the early commissioning of the CERN Large Hadron Collider (LHC), two counter-rotating proton bunches were circulated for the first time concurrently in the machine, at the LHC injection energy of 450 GeV per beam. Although the proton intensity was very low, with only one pilot bunch per beam, and no systematic attempt was made to optimize the collision optics, all LHC experiments reported a number of collision candidates. In the ALICE experiment, the collision region was centred very well in both the longitudinal and transverse directions and 284 events were recorded in coincidence with the two passing proton bunches. The events were immediately reconstructed and analyzed both online and offline. We have used these events to measure the pseudorapidity density of charged primary particles in the central region. In the range vertical bar eta vertical bar < 0.5, we obtain dN(ch)/d eta = 3.10 +/- 0.13(stat.) +/- 0.22(syst.) for all inelastic interactions, and dN(ch)/d eta = 3.51 +/- 0.15(stat.) +/- 0.25(syst.) for nonsingle diffractive interactions. These results are consistent with previous measurements in proton-antiproton interactions at the same centre-of-mass energy at the CERN SpS collider. They also illustrate the excellent functioning and rapid progress of the LHC accelerator, and of both the hardware and software of the ALICE experiment, in this early start-up phase.
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Publisher |
SPRINGER
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Date |
2011-11-07T16:26:13Z
2011-12-26T13:01:27Z 2011-12-27T05:44:56Z 2011-11-07T16:26:13Z 2011-12-26T13:01:27Z 2011-12-27T05:44:56Z 2010 |
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Type |
Article
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Identifier |
EUROPEAN PHYSICAL JOURNAL C, 65(1-2), 111-125
1434-6044 http://dx.doi.org/10.1140/epjc/s10052-009-1227-4 http://dspace.library.iitb.ac.in/xmlui/handle/10054/16592 http://hdl.handle.net/10054/16592 |
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Language |
en
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