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 Sp<(p)over bar>S 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.
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 / Aamodt, K; Abel, N; Abeysekara, U; Quintana, Aa; Acero, A; Adamova, D; Aggarwal, Mm; Rinella, Ga; Agocs, Ag; Salazar, Sa; Ahammed, Z; Ahmad, A; Ahmad, N; Ahn, Su; Akimoto, R; Akindinov, A; Aleksandrov, D; Alessandro, B; Molina, Ra; Alici, A; Avina, Ea; Alme, J; Alt, T; Altini, V; Altinpinar, S; Andrei, C; Andronic, A; Anelli, G; Angelov, V; Anson, C; Anticic, T; Antinori, F; Antinori, S; Antipin, K; Antonczyk, D; Antonioli, P; Anzo, A; Aphecetche, L; Appelshauser, H; Arcelli, S; Arceo, R; Arend, A; Armesto, N; Arnaldi, R; Aronsson, T; Arsene, Ic; Asryan, A; Augustinus, A; Averbeck, R; Awes, Tc; Aysto, J; Azmi, Md; Bablok, S; Bach, M; Badala, A; Baek, Yw; Bagnasco, S; Bailhache, R; Bala, R; Baldisseri, A; Baldit, A; Ban, J; Barbera, R; Barnafoldi, Gg; Barnby, L; Barret, V; Bartke, J; Barile, F; Basile, M; Basmanov, V; Bastid, N; Bathen, B; 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C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 65:(2010), pp. 111-125. [10.1140/epjc/s10052-009-1227-4]
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
AAMODT K; ABEL N; ABEYSEKARA U; QUINTANA AA; ACERO A; ADAMOVA D; AGGARWAL MM; RINELLA GA; AGOCS AG; SALAZAR SA; AHAMMED Z; AHMAD A; AHMAD N; AHN SU; AKIMOTO R; AKINDINOV A; ALEKSANDROV D; ALESSANDRO B; MOLINA RA; ALICI A; AVINA EA; ALME J; ALT T; ALTINI V; ALTINPINAR S; ANDREI C; ANDRONIC A; ANELLI G; ANGELOV V; ANSON C; ANTICIC T; ANTINORI F; ANTINORI S; ANTIPIN K; ANTONCZYK D; ANTONIOLI P; ANZO A; APHECETCHE L; APPELSHAUSER H; ARCELLI S; ARCEO R; AREND A; ARMESTO N; ARNALDI R; ARONSSON T; ARSENE IC; ASRYAN A; AUGUSTINUS A; AVERBECK R; AWES TC; AYSTO J; AZMI MD; BABLOK S; BACH M; BADALA A; BAEK YW; BAGNASCO S; BAILHACHE R; BALA R; BALDISSERI A; BALDIT A; BAN J; BARBERA R; BARNAFOLDI GG; BARNBY L; BARRET V; BARTKE J; BARILE F; BASILE M; BASMANOV V; BASTID N; BATHEN B; BATIGNE G; BATYUNYA B; BAUMANN C; BEARDEN I; BECKER B; BELIKOV I; BELLWIED R; BELMONT MORENO E; BELOGIANNI A; BENHABIB L; BEOLE S; BERCEANU I; BERCUCI A; BERDERMANN E; BERDNIKOV Y; BETEV L; BHASIN A; BHATI AK; BIANCHI L; BIANCHI N; BIANCHIN C; BIELCIK J; BIELCIKOVA J; BILANDZIC A; BIMBOT L; BIOLCATI E; BLANC A; BLANCO F; BLANCO F; BLAU D; BLUME C; BOCCIOLI M; BOCK N; BOGDANOV A; BOGGILD H; BOGOLYUBSKY M; BOHM J; BOLDIZSAR L; BOMBARA M; BOMBONATI C; BONDILA M; BOREL H; BORSHCHOV V; BORTOLIN C; BOSE S; BOSISIO L; BOSSU F; BOTJE M; BOTTGER S; BOURDAUD G; BOYER B; BRAUN M; BRAUN MUNZINGER P; BRAVINA L; BREGANT M; BREITNER T; BRUCKNER G; BRUN R; BRUNA E; BRUNO GE; BUDNIKOV D; BUESCHING H; BUGAEV K; BUNCIC P; BUSCH O; BUTHELEZI Z; CAFFARRI D; CAI X; CAINES H; CAMACHO E; CAMERINI P; CAMPBELL M; ROMAN VC; CAPITANI GP; ROMEO GC; CARENA F; CARENA W; CARMINATI F; DIAZ AC; CASELLE M; CASTELLANOS JC; HERNANDEZ JFC; CATANESCU V; CATTARUZZA E; CAVICCHIOLI C; CERELLO P; CHAMBERT V; CHANG B; CHAPELAND S; CHARPY A; CHARVET JL; CHATTOPADHYAY S; CHATTOPADHYAY S; CHERNEY M; CHESHKOV C; CHEYNIS B; CHIAVASSA E; BARROSO VC; CHINELLATO DD; CHOCHULA P; CHOI K; CHOJNACKI M; CHRISTAKOGLOU P; CHRISTENSEN CH; CHRISTIANSEN P; CHUJO T; CHUMAN F; CICALO C; CIFARELLI L; CINDOLO F; CLEYMANS J; COBANOGLU O; COFFIN JP; COLI S; COLLA A; BALBASTRE GC; DEL VALLE ZC; CONNER ES; CONSTANTIN P; CONTIN G; CONTRERAS JG; MORALES YC; CORMIER TM; CORTESE P; MALDONADO IC; COSENTINO MR; COSTA F; COTALLO ME; CRESCIO E; CROCHET P; CUAUTLE E; CUNQUEIRO L ;CUSSONNEAU J; DAINESE A; DALSGAARD HH; DANU A; DAS I; DAS S; 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; 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; 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; DIAZ L; DIAZ R; DIETEL T; DING H; DIVIA R; DJUVSLAND O; VALDIVIESSO GD; DOBRETSOV V; DOBRIN A; DOBROWOLSKI T; DONIGUS B; DOMINGUEZ I; DON DMM; DORDIC O; DUBEY AK; DUBUISSON J; DUCROUX L; DUPIEUX P; MAJUMDAR AKD; MAJUMDAR MRD; ELIA D; EMSCHERMANN D; ENOKIZONO A; ESPAGNON B; 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2010
Abstract
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 Sp<(p)over bar>S 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.
Citazione
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Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione. La simulazione si basa sui dati IRIS e sugli indicatori bibliometrici alla data indicata e non tiene conto di eventuali periodi di congedo obbligatorio, che in sede di domanda ASN danno diritto a incrementi percentuali dei valori. La simulazione può differire dall'esito di un’eventuale domanda ASN sia per errori di catalogazione e/o dati mancanti in IRIS, sia per la variabilità dei dati bibliometrici nel tempo. Si consideri che Anvur calcola i valori degli indicatori all'ultima data utile per la presentazione delle domande. La presente simulazione è stata realizzata sulla base delle specifiche raccolte sul tavolo ER del Focus Group IRIS coordinato dall’Università di Modena e Reggio Emilia e delle regole riportate nel DM 589/2018 e allegata Tabella A. Cineca, l’Università di Modena e Reggio Emilia e il Focus Group IRIS non si assumono alcuna responsabilità in merito all’uso che il diretto interessato o terzi faranno della simulazione. Si specifica inoltre che la simulazione contiene calcoli effettuati con dati e algoritmi di pubblico dominio e deve quindi essere considerata come un mero ausilio al calcolo svolgibile manualmente o con strumenti equivalenti.