Measurement of theB+production cross section inpp¯collisions ats=

Abstract

We present a new measurement of the B + meson differential cross section dσ/dp T at √ s = 1960GeV. The data correspond to an integrated luminosity of 739 pb −1 collected with the upgraded CDF detector (CDF II) at the Fermilab Tevatron collider. B + candidates are reconstructed through the decay B + → J/ψ K + , with J/ψ → µ + µ − . The integrated cross section for producing B + mesons with p T ≥ 6 GeV/c and |y| ≤ 1 is measured to be 2.78 ± 0.24 µb.

Measurement of theB0Production Cross Section inppCollisions ats=7 Chatrchyan1, Khachatryan2, Sirunyan3 et al. 2011Phys. Rev. Lett.Self Cite602210View full textAdd to dashboardCite

“…The total cross section for p B T > 5 GeV and jy B j < 2:2 is measured to be 33:2 AE 2:5 AE 3:5 b, where the first uncertainty is statistical and the second is systematic. DOI: 10.1103/PhysRevLett.106.252001 PACS numbers: 13.85.Rm, 12.38.Bx, 14.40.Nd Cross sections for heavy quark production in hard scattering interactions have been studied at p " p colliders at center-of-mass energies from 630 GeV [1] to 1.96 TeV [2][3][4] and in p-nucleus collisions with beam energies from 800 to 920 GeV [5]. The expected cross sections can be calculated in perturbative quantum chromodynamics.…”

Heavy flavour production at Tevatron and parton shower effects

“…The central FONLL predictions [9] also lie below the data on the D 0 , D + , D * + and D + s cross sections which has been measured [5] by the CDF collaboration as a functions of their transverse momenta. Recently the calculations in the general-mass variable-flavour-number scheme (GM-VFNS) were performed [10,11] for the transverse momentum distribution of B and D mesons and have been found to be consistent with the data [4,5]. However, there is still no GM-VFNS predictions for other measured quantities (like distributions in rapidity and azimuthal angle difference between the momenta of final mesons).…”

“…The CDF collaboration has measured [4,5] Figure 2. Importance of non-zero transverse momentum of incoming gluons in charm and beauty production at the Tevatron.…”

“…At present, the problem of description of the charm and beauty production at the Tevatron within QCD is not fully solved. So, the difference between the D0 and CDF measurements [1][2][3][4] of the b-quark and B-meson production cross sections and the calculations [7,8] performed in the framework of fixed-order next-to-leading logarithm scheme (FONLL) is about of a factor of 1.7. The central FONLL predictions [9] also lie below the data on the D 0 , D + , D * + and D + s cross sections which has been measured [5] by the CDF collaboration as a functions of their transverse momenta.…”

Prompt and non-prompt J/ψ production in pp collisions at $\sqrt{s} = 7$ TeV

“…Past discrepancies between the Tevatron results (both from inclusive [5] and exclusive [8] measurements) and the next-to-leading-order (NLO) QCD theoretical calculations, were recently resolved using the fixed-order next-to-leading-log (FONLL) approach and updated measurements of the b → J/ψ fragmentation and decay [9,10]. Measured cross-section values and spectra are also found to be in agreement with Monte Carlo generators following this approach, such as MC@NLO [11,12].…”