Measurement of prompt J/ψ and beauty hadron production cross sections at mid-rapidity in pp collisions at √s=7 TeV
Articolo
Data di Pubblicazione:
2012
Abstract:
The ALICE experiment at the LHC has studied J/ψ production at midrapidity in pp collisions at √s = 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity Lint = 5.6 nb−1. The fraction of J/ψ from the decay of long-lived beauty hadrons was determined for J/ψ candidates with transverse momentum pt > 1.3GeV/c and rapidity |y| < 0.9. The cross section for prompt J/ψ
mesons, i.e. directly produced J/ψ and prompt decays of heavier charmonium states such as the ψ(2S) and χc resonances, is σprompt J/ψ (pt > 1.3 GeV/c, |y| < 0.9) = 8.3±0.8 (stat.) ± 1.1 (syst.) +1.5 −1.4 (syst. pol.) μb. The cross section for the production of b-hadrons decaying
to J/ψ with pt > 1.3GeV/c and |y| < 0.9 is σJ/ψ←hB (pt > 1.3 GeV/c, |y| < 0.9) = 1.46 ± 0.38 (stat.) +0.26 −0.32 (syst.) μb. The results are compared to QCD model predictions. The shape of the pt and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the bb pair total
cross section and dσ/dy at mid-rapidity.
mesons, i.e. directly produced J/ψ and prompt decays of heavier charmonium states such as the ψ(2S) and χc resonances, is σprompt J/ψ (pt > 1.3 GeV/c, |y| < 0.9) = 8.3±0.8 (stat.) ± 1.1 (syst.) +1.5 −1.4 (syst. pol.) μb. The cross section for the production of b-hadrons decaying
to J/ψ with pt > 1.3GeV/c and |y| < 0.9 is σJ/ψ←hB (pt > 1.3 GeV/c, |y| < 0.9) = 1.46 ± 0.38 (stat.) +0.26 −0.32 (syst.) μb. The results are compared to QCD model predictions. The shape of the pt and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the bb pair total
cross section and dσ/dy at mid-rapidity.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
Hadron-Hadron Scattering
Elenco autori:
Abelev, Betty; Adam, Jaroslav; Adamova, Dagmar; Marshall Adare, Andrew; Aggarwal, Madan; Aglieri Rinella, Gianluca; Gabor Agocs, Andras; Agostinelli, Andrea; Aguilar Salazar, Saul; Ahammed, Zubayer; Ahmad, Arshad; Ahmad, Nazeer; Ahn, Sul-Ah; Un Ahn, Sang; Akindinov, Alexander; Aleksandrov, Dmitry; Alessandro, Bruno; Ruben Alfaro Molina, Jose; Alici, Andrea; Alkin, Anton; Jonathan Almaraz Avina, Erick; Alme, Johan; Alt, Torsten; Altini, Valerio; Altinpinar, Sedat; Altsybeev, Igor; Andrei, Cristian; Andronic, Anton; Anguelov, Venelin; Anielski, Jonas; Daniel Anson, Christopher; Anticic, Tome; Antinori, Federico; Antonioli, Pietro; Bernard Aphecetche, Laurent; Appelshauser, Harald; Arbor, Nicolas; Arcelli, Silvia; Arend, Andreas; Armesto, Nestor; Arnaldi, Roberta; Robert Aronsson, Tomas; Cristian Arsene, Ionut; Arslandok, Mesut; Asryan, Andzhey; Augustinus, Andre; Peter Averbeck, Ralf; Awes, Terry; Heikki Aysto, Juha; Danish Azmi, Mohd; Jakob Bach, Matthias; Badala, Angela; Wook Baek, Yong; Marie Bailhache, Raphaelle; Bala, Renu; Baldini Ferroli, Rinaldo; Baldisseri, Alberto; Baldit, Alain; Baltasar Santos Pedrosa, Fernando; Ban, Jaroslav; Chandra Baral, Rama; Barbera, Roberto; Barile, Francesco; Gabor Barnafoldi, Gergely; Stuart Barnby, Lee; Barret, Valerie; Gustaw Bartke, Jerzy; Basile, Maurizio; Bastid, Nicole; Basu, Sumit; Bathen, Bastian; Batigne, Guillaume; Batyunya, Boris; Heinrich Baumann, Christoph; Gardner Bearden, Ian; Beck, Hans; Kumar Behera, Nirbhay; Belikov, Iouri; Bellini, Francesca; Bellwied, Rene; Belmont-Moreno, Ernesto; Bencedi, Gyula; Beole, Stefania; Berceanu, Ionela; Bercuci, Alexandru; Berdnikov, Yaroslav; Berenyi, Daniel; Annick Erica Bergognon, Anais; Berzano, Dario; Betev, Latchezar; Bhasin, Anju; Kumar Bhati, Ashok; Bhom, Jihyun; Bianchi, Livio; Bianchi, Nicola; Bianchin, Chiara; Bielcik, Jaroslav; Bielcikova, Jana; Bilandzic, Ante; Bjelogrlic, Sandro; Blanco, F.; Blanco, Francesco; Blau, Dmitry; Blume, Christoph; Boccioli, Marco; Bock, Nicolas; Boettger, Stefan; Bogdanov, Alexey; Boggild, Hans; Bogolyubsky, Mikhail; Boldizsar, Laszlo; Bombara, Marek; Book, Julian; Borel, Herve; Borissov, Alexander; Nath Bose, Suvendu; Bossu, Francesco; Botje, Michiel; Alexandre Boyer, Bruno; Braidot, Ermes; Braun-Munzinger, Peter; Bregant, Marco; Gunther Breitner, Timo; Allen Browning, Tyler; Broz, Michal; Brun, Rene; Bruna, Elena; Eugenio Bruno, Giuseppe; Budnikov, Dmitry; Buesching, Henner; Bufalino, Stefania; Bugaiev, Kyrylo; Busch, Oliver; Zinhle Buthelezi, Edith; Caballero Orduna, Diego; Caffarri, Davide; Cai, Xu; Louise Caines, Helen; Calvo Villar, Ernesto; Camerini, Paolo; Canoa Roman, Veronica; Cara Romeo, Giovanni; Carena, Francesco; Carena, Wisla; Carlin Filho, Nelson; Carminati, Federico; Andres Carrillo Montoya, Camilo; Ofelia Casanova Diaz, Amaya; Ernesto Castillo Castellanos, Javier; Francisco Castillo Hernandez, Juan; Anna Rita Casula, Ester; Catanescu, Vasile; Cavicchioli, Costanza; Ceballos Sanchez, Cesar; Cepila, Jan; Cerello, Piergiorgio; Chang, Beomsu; Chapeland, Sylvain; Fernand Charvet, Jean-Luc; Chattopadhyay, Subhasis; Chattopadhyay, Sukalyan; Chawla, Isha; Gerard Cherney, Michael; Cheshkov, Cvetan; Cheynis, Brigitte; Miguel Chibante Barroso, Vasco; Chinellato, David; Chochula, Peter; Chojnacki, Marek; Choudhury, Subikash; Christakoglou, Panagiotis; Holm Christensen, Christian; Christiansen, Peter; Chujo, Tatsuya; Chung, Suh-Urk; Cicalo, Corrado; Cifarelli, Luisa; Cindolo, Federico; Willy Andre Cleymans, Jean; Coccetti, Fabrizio; Colamaria, Fabio; Colella, Domenico; Conesa Balbastre, Gustavo; Conesa Valle, Zaida; Constantin, Paul; Contin, Giacomo; Guillermo Contreras, Jesus; Michael Cormier, Thomas; Corrales Morales, Yasser; Cortese, Pietro; Cortes Maldonado, Ismael; Rogerio Cosentino, Mauro; Costa, Filippo; Enrique Cotallo, Manuel; Crescio, Elisabetta; Crochet, Philippe; Cruz Alaniz, Emilia; Cuautle, Eleazar; Cunqueiro, Leticia; Dainese, Andrea; Hjersing Dalsgaard, Hans; Danu, Andrea; Das, Deb
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