This paper describes a measurement of the flavour composition of dijet events produced in pp collisions at √ s = 7 TeV using the ATLAS detector. The measurement uses the full 2010 data sample, corresponding to an inte- grated luminosity of 39 pb − 1 . Six possible combinations of light, charm and bottom jets are identified in the dijet events, where the jet flavour is defined by the presence of bottom, charm or solely light flavour hadrons in the jet. Kinematic variables, based on the properties of displaced decay ver- tices and optimised for jet flavour identification, are used in a multidimensional template fit to measure the fractions of these dijet flavour states as functions of the leading jet trans- verse momentum in the range 40 GeV to 500 GeV and jet rapidity | y | < 2 . 1. The fit results agree with the predictions of leading- and next-to-leading-order calculations, with the exception of the dijet fraction composed of bottom and light flavour jets, which is underestimated by all models at large transverse jet momenta. The ability to identify jets contain- ing two b -hadrons, originating from e.g. gluon splitting, is demonstrated. The difference between bottom jet produc- tion rates in leading and subleading jets is consistent with the next-to-leading-order predictions.
Measurement of the flavour composition of dijet events in pp collisions at $\sqrt{s}=7\ \mbox{TeV}$ with the ATLAS detector / G. Aad;T. Abajyan;B. Abbott;J. Abdallah;S. Abdel Khalek;A. A. Abdelalim;O. Abdinov;R. Aben;B. Abi;M. Abolins;O. S. AbouZeid;H. Abramowicz;H. Abreu;E. Acerbi;B. S. Acharya;L. Adamczyk;D. L. Adams;T. N. Addy;J. Adelman;S. Adomeit;P. Adragna;T. Adye;S. Aefsky;J. A. Aguilar-Saavedra;M. Agustoni;M. Aharrouche;S. P. Ahlen;F. Ahles;A. Ahmad;M. Ahsan;G. Aielli;T. Akdogan;T. P. A. Åkesson;G. Akimoto;A. V. Akimov;M. S. Alam;M. A. Alam;J. Albert;S. Albrand;M. Aleksa;I. N. Aleksandrov;F. Alessandria;C. Alexa;G. Alexander;G. Alexandre;T. Alexopoulos;M. Alhroob;M. Aliev;G. Alimonti;J. Alison;B. M. M. Allbrooke;P. P. Allport;S. E. Allwood-Spiers;J. Almond;A. Aloisio;R. Alon;A. Alonso;F. Alonso;B. Alvarez Gonzalez;M. G. Alviggi;K. Amako;C. Amelung;V. V. Ammosov;S. P. Amor Dos Santos;A. Amorim;N. Amram;C. Anastopoulos;L. S. Ancu;N. Andari;T. Andeen;C. F. Anders;G. Anders;K. J. Anderson;A. Andreazza;V. Andrei;M-L. Andrieux;X. S. Anduaga;P. Anger;A. Angerami;F. Anghinolfi;A. Anisenkov;N. Anjos;A. Annovi;A. Antonaki;M. Antonelli;A. Antonov;J. Antos;F. Anulli;M. Aoki;S. Aoun;L. Aperio Bella;R. Apolle;G. Arabidze;I. Aracena;Y. Arai;A. T. H. Arce;S. Arfaoui;J-F. Arguin;E. Arik;M. Arik;A. J. Armbruster;O. Arnaez;V. Arnal;C. Arnault;A. Artamonov;G. Artoni;D. Arutinov;S. Asai;R. Asfandiyarov;S. Ask;B. Åsman;L. Asquith;K. Assamagan;A. Astbury;M. Atkinson;B. Aubert;E. Auge;K. Augsten;M. Aurousseau;G. Avolio;R. Avramidou;D. Axen;G. Azuelos;Y. Azuma;M. A. Baak;G. Baccaglioni;C. Bacci;A. M. Bach;H. Bachacou;K. Bachas;M. Backes;M. Backhaus;E. Badescu;P. Bagnaia;S. Bahinipati;Y. Bai;D. C. Bailey;T. Bain;J. T. Baines;O. K. Baker;M. D. Baker;S. Baker;E. Banas;P. Banerjee;Sw. Banerjee;D. Banfi;A. Bangert;V. Bansal;H. S. Bansil;L. Barak;S. P. Baranov;A. Barbaro Galtieri;T. Barber;E. L. Barberio;D. Barberis;M. Barbero;D. Y. Bardin;T. Barillari;M. Barisonzi;T. Barklow;N. 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[10.1140/epjc/s10052-013-2301-5]
Measurement of the flavour composition of dijet events in pp collisions at $\sqrt{s}=7\ \mbox{TeV}$ with the ATLAS detector
BELLAGAMBA, LORENZO;BERTIN, ANTONIO;BOSCHERINI, DAVIDE;BRUNI, ALESSIA;BRUNI, GRAZIANO;CAFORIO, DAVIDE;DE CASTRO, STEFANO;DI SIPIO, RICCARDO;FABBRI, LAURA;FRANCHINI, MATTEO;GIACOBBE, BENEDETTO;MASSA, IGNAZIO GIACOMO;MENGARELLI, ALBERTO;MONZANI, SIMONE;PICCININI, MAURIZIO;RINALDI, LORENZO;ROMANO, MARINO;SBARRA, CARLA;SBRIZZI, ANTONIO;SEMPRINI CESARI, NICOLA;SPIGHI, ROBERTO;VALENTINETTI, SARA;VILLA, MAURO;I. Vivarelli;ZOCCOLI, ANTONIO;
2013
Abstract
This paper describes a measurement of the flavour composition of dijet events produced in pp collisions at √ s = 7 TeV using the ATLAS detector. The measurement uses the full 2010 data sample, corresponding to an inte- grated luminosity of 39 pb − 1 . Six possible combinations of light, charm and bottom jets are identified in the dijet events, where the jet flavour is defined by the presence of bottom, charm or solely light flavour hadrons in the jet. Kinematic variables, based on the properties of displaced decay ver- tices and optimised for jet flavour identification, are used in a multidimensional template fit to measure the fractions of these dijet flavour states as functions of the leading jet trans- verse momentum in the range 40 GeV to 500 GeV and jet rapidity | y | < 2 . 1. The fit results agree with the predictions of leading- and next-to-leading-order calculations, with the exception of the dijet fraction composed of bottom and light flavour jets, which is underestimated by all models at large transverse jet momenta. The ability to identify jets contain- ing two b -hadrons, originating from e.g. gluon splitting, is demonstrated. The difference between bottom jet produc- tion rates in leading and subleading jets is consistent with the next-to-leading-order predictions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.