Transverse sphericity of primary charged particles in minimum bias proton–proton collisions at root(s)=0.9, 2.76 and 7 TeV
Articolo
Data di Pubblicazione:
2012
Abstract:
Abstract Measurements of the sphericity of primary charged particles in minimum bias proton–proton collisions at root(s) = 0.9, 2.76 and 7 TeV with the ALICE detector at the LHC are presented. The observable is measured in the plane perpendicular to the beam direction using primary
charged tracks with pT > 0.5 GeV/c in |η| < 0.8. The mean sphericity as a function of the charged particle multiplicity at mid-rapidity (Nch ) is reported for events with different pT scales (“soft” and “hard”) defined by the transverse momentum of the leading particle. In addition, the mean charged particle transverse momentum versus multiplicity is presented for the different event classes, and the sphericity distributions in bins of multiplicity are presented. The data are compared with calculations of standard Monte Carlo event generators. The transverse sphericity is found
to grow with multiplicity at all collision energies, with a steeper rise at low Nch , whereas the event generators show an opposite tendency. The combined study of the sphericity and the mean pT with multiplicity indicates that most of the tested event generators produce events with higher multiplicity by generating more back-to-back jets resulting in de-
creased sphericity (and isotropy). The PYTHIA6 generator with tune PERUGIA-2011 exhibits a noticeable improvement in describing the data, compared to the other tested generators.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
B. Abelev;J. Adam;D. Adamová;A. M. Adare;M. M. Aggarwal;G. Aglieri Rinella;A. G. Agocs;A. Agostinelli;S. Aguilar Salazar;Z. Ahammed;N. Ahmad;A. Ahmad Masoodi;S. U. Ahn;A. Akindinov;D. Aleksandrov;B. Alessandro;R. Alfaro Molina;A. Alici;A. Alkin;E. Almaráz Aviña;J. Alme;T. Alt;V. Altini;S. Altinpinar;I. Altsybeev;C. Andrei;A. Andronic;V. Anguelov;J. Anielski;C. Anson;T. Antičić;F. Antinori;P. Antonioli;L. Aphecetche;H. Appelshäuser;N. Arbor;S. Arcelli;A. Arend;N. Armesto;R. Arnaldi;T. Aronsson;I. C. Arsene;M. Arslandok;A. Asryan;A. Augustinus;R. Averbeck;T. C. Awes;J. Äystö;M. D. Azmi;M. Bach;A. Badalà;Y. W. Baek;R. Bailhache;R. Bala;R. Baldini Ferroli;A. Baldisseri;A. Baldit;F. Baltasar Dos Santos Pedrosa;J. Bán;R. C. Baral;R. Barbera;F. Barile;G. G. Barnaföldi;L. S. Barnby;V. Barret;J. Bartke;M. Basile;N. Bastid;S. Basu;B. Bathen;G. Batigne;B. Batyunya;C. Baumann;I. G. Bearden;H. Beck;I. Belikov;F. Bellini;R. Bellwied;E. Belmont-Moreno;G. Bencedi;S. Beole;I. Berceanu;A. Bercuci;Y. Berdnikov;D. Berenyi;D. Berzano;L. Betev;A. Bhasin;A. K. Bhati;J. Bhom;N. Bianchi;L. Bianchi;C. Bianchin;J. Bielčík;J. Bielčíková;A. Bilandzic;S. Bjelogrlic;F. Blanco;F. Blanco;D. Blau;C. Blume;M. Boccioli;N. Bock;S. Böttger;A. Bogdanov;H. Bøggild;M. Bogolyubsky;L. Boldizsár;M. Bombara;J. Book;H. Borel;A. Borissov;S. Bose;F. Bossú;M. Botje;B. Boyer;E. Braidot;P. Braun-Munzinger;M. Bregant;T. Breitner;T. A. Browning;M. Broz;R. Brun;E. Bruna;G. E. Bruno;D. Budnikov;H. Buesching;S. Bufalino;K. Bugaiev;O. Busch;Z. Buthelezi;D. Caballero Orduna;D. Caffarri;X. Cai;H. Caines;E. Calvo Villar;P. Camerini;V. Canoa Roman;G. Cara Romeo;W. Carena;F. Carena;N. Carlin Filho;F. Carminati;C. A. Carrillo Montoya;A. Casanova Díaz;J. Castillo Castellanos;J. F. Castillo Hernandez;E. A. R. Casula;V. Catanescu;C. Cavicchioli;C. Ceballos Sanchez;J. Cepila;P. Cerello;B. Chang;S. Chapeland;J. L. Charvet;S. Chattopadhyay;S. Chattopadhyay;I. Chawla;M. Cherney;C. Cheshkov;B. Cheynis;V. Chibante Barroso;D. D. Chinellato;P. Chochula;M. Chojnacki;S. Choudhury;P. Christakoglou;C. H. Christensen;P. Christiansen;T. Chujo;S. U. Chung;C. Cicalo;L. Cifarelli;F. Cindolo;J. Cleymans;F. Coccetti;F. Colamaria;D. Colella;G. Conesa Balbastre;Z. Conesa del Valle;P. Constantin;G. Contin;J. G. Contreras;T. M. Cormier;Y. Corrales Morales;P. Cortese;I. Cortés Maldonado;M. R. Cosentino;F. Costa;M. E. Cotallo;E. Crescio;P. Crochet;E. Cruz Alaniz;E. Cuautle;L. Cunqueiro;A. Dainese;H. H. Dalsgaard;A. Danu;I. Das;K. Das;D. Das;A. Dash;S. Dash;S. De;G. O. V. Barros;A. Caro;G. Cataldo;J. Cuveland;A. Falco;D. Gruttola;H. Delagrange;A. Deloff;V. Demanov;N. Marco;E. Dénes;S. Pasquale;A. Deppman;G. D Erasmo;R. Rooij;M. A. Diaz Corchero;D. Bari;T. Dietel;S. Liberto;A. Mauro;P. Nezza;R. Divià;Ø. Djuvsland;A. Dobrin;T. Dobrowolski;I. Domínguez;B. Dönigus;O. Dordic;O. Driga;A. K. Dubey;L. Ducroux;P. Dupieux;A. K. Dutta Majumdar;M. R. Dutta Majumdar;D. Elia;D. Emschermann;H. Engel;H. A. Erdal;B. Espagnon;M. Estienne;S. Esumi;D. Evans;G. Eyyubova;D. Fabris;J. Faivre;D. Falchieri;A. Fantoni;M. Fasel;R. Fearick;A. Fedunov;D. Fehlker;L. Feldkamp;D. Felea;B. Fenton-Olsen;G. Feofilov;A. Fernández Téllez;R. Ferretti;A. Ferretti;J. Figiel;M. A. S. Figueredo;S. Filchagin;D. Finogeev;F. M. Fionda;E. M. Fiore;M. Floris;S. Foertsch;P. Foka;S. Fokin;E. Fragiacomo;U. Frankenfeld;U. Fuchs;C. Furget;M. Fusco Girard;J. J. Gaardhøje;M. Gagliardi;A. Gago;M. Gallio;D. R. Gangadharan;P. Ganoti;C. Garabatos;E. Garcia-Solis;I. Garishvili;J. Gerhard;M. Germain;C. Geuna;A. Gheata;M. Gheata;B. Ghidini;P. Ghosh;P. Gianotti;M. R. Girard;P. Giubellino;E. Gladysz-Dziadus;P. Glässel;R. Gomez;E. G. F
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