Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at √sNN =2.76 TeV

B.I. Abelev; P. Christakoglou; T. Peitzmann; R.J.M. Snellings; A.P. de Haas; G.J.L. Nooren; C.J. Oskamp; A. van den Brink; P.G. Kuijer; M.A.J. Botje; N. van der Kolk; A. Mischke; M. van Leeuwen; A. Grelli; M. Verweij; A. Bilandzic; M. Chojnacki; C. E. Perez Lara; D. Thomas; G. Luparello

doi:10.1007/JHEP03(2012)053

Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at √sNN =2.76 TeV

B.I. Abelev, P. Christakoglou, T. Peitzmann, R.J.M. Snellings, A.P. de Haas, G.J.L. Nooren, C.J. Oskamp, A. van den Brink, P.G. Kuijer, M.A.J. Botje, N. van der Kolk, A. Mischke, M. van Leeuwen, A. Grelli, M. Verweij, A. Bilandzic, M. Chojnacki, C. E. Perez Lara, D. Thomas, G. Luparello

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Abstract

The effect of event background fluctuations on charged particle jet reconstruction in Pb-Pb collisions at √sNN = 2.76 has been measured with the ALICE experiment. The main sources of non-statistical fluctuations are characterized based purely on experimental data with an unbiased method, as well as by using single high p t particles and simulated jets embedded into real Pb-Pb events and reconstructed with the anti-k t jet finder. The influence of a low transverse momentum cut-off on particles used in the jet reconstruction is quantified by varying the minimum track p t between 0.15 GeV/c and 2 GeV/c. For embedded jets reconstructed from charged particles with p t > 0.15 GeV/c, the uncertainty in the reconstructed jet transverse momentum due to the heavy-ion background is measured to be 11.3 GeV/c (standard deviation) for the 10% most central Pb-Pb collisions, slightly larger than the value of 11.0 GeV/c measured using the unbiased method. For a higher particle transverse momentum threshold of 2 GeV/c, which will generate a stronger bias towards hard fragmentation in the jet finding process, the standard deviation of the fluctuations in the reconstructed jet transverse momentum is reduced to 4.8-5.0 GeV/c for the 10% most central events. A non-Gaussian tail of the momentum uncertainty is observed and its impact on the reconstructed jet spectrum is evaluated for varying particle momentum thresholds, by folding the measured fluctuations with steeply falling spectra.

Original language	English
Pages (from-to)	1-25
Number of pages	25
Journal	Journal of High Energy Physics
Volume	1203
Issue number	053
DOIs	https://doi.org/10.1007/JHEP03(2012)053
Publication status	Published - 2012

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Abelev, B. I., Christakoglou, P., Peitzmann, T., Snellings, R. J. M., de Haas, A. P., Nooren, G. J. L., Oskamp, C. J., van den Brink, A., Kuijer, P. G., Botje, M. A. J., van der Kolk, N., Mischke, A., van Leeuwen, M., Grelli, A., Verweij, M., Bilandzic, A., Chojnacki, M., Perez Lara, C. E., Thomas, D., & Luparello, G. (2012). Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at √sNN =2.76 TeV. Journal of High Energy Physics, 1203(053), 1-25. https://doi.org/10.1007/JHEP03(2012)053

@article{35a2c370ff2941ff8c8ee9bd74ad718f,

title = "Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at √sNN =2.76 TeV",

abstract = "The effect of event background fluctuations on charged particle jet reconstruction in Pb-Pb collisions at √sNN = 2.76 has been measured with the ALICE experiment. The main sources of non-statistical fluctuations are characterized based purely on experimental data with an unbiased method, as well as by using single high p t particles and simulated jets embedded into real Pb-Pb events and reconstructed with the anti-k t jet finder. The influence of a low transverse momentum cut-off on particles used in the jet reconstruction is quantified by varying the minimum track p t between 0.15 GeV/c and 2 GeV/c. For embedded jets reconstructed from charged particles with p t > 0.15 GeV/c, the uncertainty in the reconstructed jet transverse momentum due to the heavy-ion background is measured to be 11.3 GeV/c (standard deviation) for the 10% most central Pb-Pb collisions, slightly larger than the value of 11.0 GeV/c measured using the unbiased method. For a higher particle transverse momentum threshold of 2 GeV/c, which will generate a stronger bias towards hard fragmentation in the jet finding process, the standard deviation of the fluctuations in the reconstructed jet transverse momentum is reduced to 4.8-5.0 GeV/c for the 10% most central events. A non-Gaussian tail of the momentum uncertainty is observed and its impact on the reconstructed jet spectrum is evaluated for varying particle momentum thresholds, by folding the measured fluctuations with steeply falling spectra.",

author = "B.I. Abelev and P. Christakoglou and T. Peitzmann and R.J.M. Snellings and {de Haas}, A.P. and G.J.L. Nooren and C.J. Oskamp and {van den Brink}, A. and P.G. Kuijer and M.A.J. Botje and {van der Kolk}, N. and A. Mischke and {van Leeuwen}, M. and A. Grelli and M. Verweij and A. Bilandzic and M. Chojnacki and {Perez Lara}, {C. E.} and D. Thomas and G. Luparello",

year = "2012",

doi = "10.1007/JHEP03(2012)053",

language = "English",

volume = "1203",

pages = "1--25",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer Verlag",

number = "053",

}

Abelev, BI, Christakoglou, P, Peitzmann, T , Snellings, RJM, de Haas, AP, Nooren, GJL, Oskamp, CJ, van den Brink, A, Kuijer, PG, Botje, MAJ, van der Kolk, N, Mischke, A, van Leeuwen, M , Grelli, A , Verweij, M, Bilandzic, A, Chojnacki, M, Perez Lara, CE, Thomas, D & Luparello, G 2012, 'Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at √sNN =2.76 TeV', Journal of High Energy Physics, vol. 1203, no. 053, pp. 1-25. https://doi.org/10.1007/JHEP03(2012)053

TY - JOUR

T1 - Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at √sNN =2.76 TeV

AU - Abelev, B.I.

AU - Christakoglou, P.

AU - Peitzmann, T.

AU - Snellings, R.J.M.

AU - de Haas, A.P.

AU - Nooren, G.J.L.

AU - Oskamp, C.J.

AU - van den Brink, A.

AU - Kuijer, P.G.

AU - Botje, M.A.J.

AU - van der Kolk, N.

AU - Mischke, A.

AU - van Leeuwen, M.

AU - Grelli, A.

AU - Verweij, M.

AU - Bilandzic, A.

AU - Chojnacki, M.

AU - Perez Lara, C. E.

AU - Thomas, D.

AU - Luparello, G.

PY - 2012

Y1 - 2012

N2 - The effect of event background fluctuations on charged particle jet reconstruction in Pb-Pb collisions at √sNN = 2.76 has been measured with the ALICE experiment. The main sources of non-statistical fluctuations are characterized based purely on experimental data with an unbiased method, as well as by using single high p t particles and simulated jets embedded into real Pb-Pb events and reconstructed with the anti-k t jet finder. The influence of a low transverse momentum cut-off on particles used in the jet reconstruction is quantified by varying the minimum track p t between 0.15 GeV/c and 2 GeV/c. For embedded jets reconstructed from charged particles with p t > 0.15 GeV/c, the uncertainty in the reconstructed jet transverse momentum due to the heavy-ion background is measured to be 11.3 GeV/c (standard deviation) for the 10% most central Pb-Pb collisions, slightly larger than the value of 11.0 GeV/c measured using the unbiased method. For a higher particle transverse momentum threshold of 2 GeV/c, which will generate a stronger bias towards hard fragmentation in the jet finding process, the standard deviation of the fluctuations in the reconstructed jet transverse momentum is reduced to 4.8-5.0 GeV/c for the 10% most central events. A non-Gaussian tail of the momentum uncertainty is observed and its impact on the reconstructed jet spectrum is evaluated for varying particle momentum thresholds, by folding the measured fluctuations with steeply falling spectra.

AB - The effect of event background fluctuations on charged particle jet reconstruction in Pb-Pb collisions at √sNN = 2.76 has been measured with the ALICE experiment. The main sources of non-statistical fluctuations are characterized based purely on experimental data with an unbiased method, as well as by using single high p t particles and simulated jets embedded into real Pb-Pb events and reconstructed with the anti-k t jet finder. The influence of a low transverse momentum cut-off on particles used in the jet reconstruction is quantified by varying the minimum track p t between 0.15 GeV/c and 2 GeV/c. For embedded jets reconstructed from charged particles with p t > 0.15 GeV/c, the uncertainty in the reconstructed jet transverse momentum due to the heavy-ion background is measured to be 11.3 GeV/c (standard deviation) for the 10% most central Pb-Pb collisions, slightly larger than the value of 11.0 GeV/c measured using the unbiased method. For a higher particle transverse momentum threshold of 2 GeV/c, which will generate a stronger bias towards hard fragmentation in the jet finding process, the standard deviation of the fluctuations in the reconstructed jet transverse momentum is reduced to 4.8-5.0 GeV/c for the 10% most central events. A non-Gaussian tail of the momentum uncertainty is observed and its impact on the reconstructed jet spectrum is evaluated for varying particle momentum thresholds, by folding the measured fluctuations with steeply falling spectra.

U2 - 10.1007/JHEP03(2012)053

DO - 10.1007/JHEP03(2012)053

M3 - Article

SN - 1126-6708

VL - 1203

SP - 1

EP - 25

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 053

ER -

Measurement of event background fluctuations for charged particle jet reconstruction in Pb-Pb collisions at √sNN =2.76 TeV

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