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1.	Abelev, Betty, et al. (author) Measurement of prompt J/psi and beauty hadron production cross sections at mid-rapidity in pp collisions at root s=7 TeV 2012 In: Journal of High Energy Physics. - 1029-8479. ; :11 Journal article (peer-reviewed)abstract The ALICE experiment at the LHC has studied J/psi production at mid-rapidity in pp collisions at root s = 7 TeV through its electron pair decay on a data sample corresponding to an integrated luminosity L-int = 5.6 nb(-1). The fraction of J/psi from the decay of long-lived beauty hadrons was determined for J/psi candidates with transverse momentum p(t) > 1,3 GeV/c and rapidity vertical bar y vertical bar < 0.9. The cross section for prompt J/psi mesons, i.e. directly produced J/psi and prompt decays of heavier charmonium states such as the psi(2S) and chi(c) resonances, is sigma(prompt J/psi) (p(t) > 1.3 GeV/c, vertical bar y vertical bar < 0.9) = 8.3 +/- 0.8(stat.) +/- 1.1 (syst.)(-1.4)(+1.5) (syst. pol.) mu b. The cross section for the production of b-hadrons decaying to J/psi with p(t) > 1.3 GeV/c and vertical bar y vertical bar < 0.9 is a sigma(J/psi <- hB) (p(t) > 1.3 GeV/c, vertical bar y vertical bar < 0.9) = 1.46 +/- 0.38 (stat.)(-0.32)(+0.26) (syst.) mu b. The results are compared to QCD model predictions. The shape of the p(t) and y distributions of b-quarks predicted by perturbative QCD model calculations are used to extrapolate the measured cross section to derive the b (b) over bar pair total cross section and d sigma/dy at mid-rapidity.

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Type of publication: journal article (1)

Type of content: peer-reviewed (1)

Author/Editor: Stenlund, Evert (1); Blanco, F. (1); Christiansen, Peter (1); Dobrin, Alexandru (1); Majumdar, A. K. Dutt ... (1); Gros, Philippe (1); show more...; Kurepin, A. (1); Pal, S. (1); Kurepin, A. B. (1); Malinina, Ludmila (1); Milosevic, Jovan (1); Ortiz Velasquez, Ant ... (1); Richert, Tuva (1); Sogaard, Carsten (1); Peskov, Vladimir (1); Abelev, Betty (1); Adam, Jaroslav (1); Adamova, Dagmar (1); Adare, Andrew Marsha ... (1); Aggarwal, Madan (1); Rinella, Gianluca Ag ... (1); Agostinelli, Andrea (1); Ahammed, Zubayer (1); Ahmad, Nazeer (1); Ahmad, Arshad (1); Ahn, Sul-Ah (1); Ahn, Sang Un (1); Akindinov, Alexander (1); Aleksandrov, Dmitry (1); Alessandro, Bruno (1); Alici, Andrea (1); Alkin, Anton (1); Almaraz Avina, Erick ... (1); Alme, Johan (1); Alt, Torsten (1); Altini, Valerio (1); Altinpinar, Sedat (1); Altsybeev, Igor (1); Andrei, Cristian (1); Andronic, Anton (1); Anguelov, Venelin (1); Anielski, Jonas (1); Anson, Christopher D ... (1); Anticic, Tome (1); Antinori, Federico (1); Antonioli, Pietro (1); Aphecetche, Laurent ... (1); Appelshauser, Harald (1); Arbor, Nicolas (1); Arcelli, Silvia (1); show less...

University: Lund University (1)

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1)

Year: 2012 (1)

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