Dielectron production in proton-proton collisions at root s=7 TeV

Acharya, S. and Collaboration, A. L. I. C. E. and Acosta, F. T. and
Adamova, D. and Adolfsson, J. and Aggarwal, M. M. and Rinella, G.
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Corral, G. and Herrmann, F. and Hetland, K. F. and Hilden, T. E. and
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A. and Zimmermann, M. B. and Zinovjev, G. and Zmeskal, J. and Zou, S.

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A. and Volpe, G. and von Haller, B. and Vorobyev, I. and Voscek, D. and Vranic, D. and Vrlakova, J. and Wagner, B. and Wang, H. and Wang, M. and Watanabe, Y. and Weber, M. and Weber, S. G. and Wegrzynek, A. and Weiser, D. F. and Wenzel, S. C. and Wessels, J. P. and Westerhoff, U. and Whitehead, A. M. and Wiechula, J. and Wikne, J. and Wilk, G. and Wilkinson, J. and Willems, G. A. and Williams, M. C. S. and Willsher, E. and Windelband, B. and Witt, W. E. and Xu, R. and Yalcin, S. and Yamakawa, K. and Yano, S. and Yin, Z. and Yokoyama, H. and Yoo, I. -K. and Yoon, J. H. and Yurchenko, V. and Zaccolo, V. and Zaman, A. and Zampolli, C. and Zanoli, H. J. C. and Zardoshti, N. and Zarochentsev, A. and Zavada, P. and Zaviyalov, N. and Zbroszczyk, H. and Zhalov, M. and Zhang, X. and Zhang, Y. and Zhang, Z. and Zhao, C. and Zherebchevskii, V. and Zhigareva, N. and Zhou, D. and Zhou, Y. and Zhou, Z. and Zhu, H. and Zhu, J. and Zhu, Y. and Zichichi, A. and Zimmermann, M. B. and Zinovjev, G. and Zmeskal, J. and Zou, S.... Show more Show less

Date

2018

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http://hdl.handle.net/20.500.12498/4516

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Abstract

The first measurement of e(+)e(-) pair production at mid-rapidity (vertical bar eta vertical bar(e) < 0.8) in pp collisions at root s = 7TeV with ALICE at the LHC is presented. The dielectron production is studied as a function of the invariant mass (m(ee )< 3.3 GeV/c(2)), the pair transverse momentum (p(T,ee) < 8 GeV/c), and the pair transverse impact parameter (DCA(ee)), i.e., the average distance of closest approach of the reconstructed electron and positron tracks to the collision vertex, noormalised to its resolution. The results are compared with the expectations from a cocktail of known hadronic sources and are well described when PYTHIA is used to generate the heavy-flavour contributions. In the low-mass region (0.14 < m(ee) < 1.1 GeV/c(2)), prompt and non-prompt e(+)e(-) sources can be separated via the DCA(ee). In the intermediate-mass region (1.1 < m(ee) < 2.7 GeV/c(2)), a double-differential fit to the data in m(ee) and p(T,ee) and a fit of the DCA(ee) distribution allow the total cc and bb cross sections to be extracted. Two different event generators, PYTHIA and POWHEG, can reproduce the shape of the two-dimensional m(ee) and p(T,ee) spectra, as well as the shape , of the DCA(ee) distribution, reasonably well. However, differences in the c (c) over bar and b (b) over bar cross sections are observed when using the generators to extrapolate to full phase space. Finally, the ratio of inclusive to decay photons is studied via the measurement of virtual direct photons in the transverse-momentum range 1 < p(T) < 8 GeV/c. This is found to be unity within the statistical and systematic uncertainties and consistent with expectations from next-to-leading order perturbative quantum chromodynamic calculations.... Show more Show less

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