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Z Ahammed - One of the best experts on this subject based on the ideXlab platform.

  • measurement of Charged Jet cross section in pp collisions at s 5 02 tev
    Physical Review D, 2019
    Co-Authors: Shreyasi Acharya, D Adamova, Jonatan Adolfsson, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Souvik Priyam Adhya, Alexander Adler, Z Ahammed
    Abstract:

    The cross section of Jets reconstructed from Charged particles is measured in the transverse momentum range of 5collisions at the center-of-mass energy of s=5.02  TeV with the ALICE detector. The Jets are reconstructed using the anti-kT algorithm with resolution parameters R=0.2, 0.3, 0.4, and 0.6 in the pseudorapidity range |η|<0.9-R. The Charged Jet cross sections are compared with the leading-order (LO) and to next-to-leading-order (NLO) perturbative quantum chromodynamics (pQCD) calculations. It is found that the NLO calculations agree better with the measurements. The cross section ratios for different resolution parameters are also measured. These ratios increase from low pT to high pT and saturate at high pT, indicating that Jet collimation is larger at high pT than at low pT. These results provide a precision test of pQCD predictions and serve as a baseline for the measurement in Pb-Pb collisions at the same energy to quantify the effects of the hot and dense medium created in heavy-ion collisions at the LHC.

  • Charged Jet cross section and fragmentation in proton proton collisions at s 7 tev
    Physical Review D, 2019
    Co-Authors: Shreyasi Acharya, D Adamova, C Adler, Jonatan Adolfsson, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Z Ahammed
    Abstract:

    We report the differential Charged Jet cross section and Jet fragmentation distributions measured with the ALICE detector in proton- proton collisions at a center-of-mass energy s=7 TeV. Jets with pseudorapidity |η| 40 GeV/c, the pythia calculations also agree with the measured Charged Jet cross section. pythia6 simulations describe the fragmentation distributions to 15%. Larger discrepancies are observed for pythia8.

  • centrality dependence of Charged Jet production in p pb collisions at snn 5 02 tev
    European Physical Journal C, 2016
    Co-Authors: J Adam, D Adamova, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Z Ahammed, Sang Un Ahn, S Ahmad, S Aiola
    Abstract:

    Measurements of Charged Jet production as a function of centrality are presented for  p-Pb  collisions recorded at [Formula: see text] TeV with the ALICE detector. Centrality classes are determined via the energy deposit in neutron calorimeters at zero degree, close to the beam direction, to minimise dynamical biases of the selection. The corresponding number of participants or binary nucleon-nucleon collisions is determined based on the particle production in the Pb-going rapidity region. Jets have been reconstructed in the central rapidity region from Charged particles with the anti-[Formula: see text] algorithm for resolution parameters [Formula: see text] and [Formula: see text] in the transverse momentum range 20 to 120 GeV/c. The reconstructed Jet momentum and yields have been corrected for detector effects and underlying-event background. In the five centrality bins considered, the Charged Jet production in  p-Pb   collisions is consistent with the production expected from binary scaling from pp collisions. The ratio of Jet yields reconstructed with the two different resolution parameters is also independent of the centrality selection, demonstrating the absence of major modifications of the radial Jet structure in the reported centrality classes.

  • azimuthal anisotropy of Charged Jet production in snn 2 76 tev pb pb collisions
    Physics Letters B, 2016
    Co-Authors: J Adam, D Adamova, M M Aggarwal, M Agnello, Z Ahammed, Aglieri G Rinella, Neelima Agrawal, Sang Un Ahn, S Aiola, A Akindinov
    Abstract:

    We present measurements of the azimuthal dependence of Charged Jet production in central and semicentral √sNN = 2.76 TeV Pb–Pb collisions with respect to the second harmonic event plane, quantified as vch Jet 2 . Jet finding is performed employing the anti-kT algorithm with a resolution parameter R = 0.2 using Charged tracks from the ALICE tracking system. The contribution of the azimuthal anisotropy of the underlying event is taken into account event-by-event. The remaining (statistical) region-to-region fluctuations are removed on an ensemble basis by unfolding the Jet spectra for different event plane orientations independently. Significant non-zero vch Jet 2 is observed in semi-central collisions (30–50% centrality) for 20 < pch Jet T < 90 GeV/c. The azimuthal dependence of the Charged Jet production is similar to the dependence observed for Jets comprising both Charged and neutral fragments, and compatible with measurements of the v2 of single Charged particles at high pT. Good agreement between the data and predictions from JEWEL, an event generator simulating parton shower evolution in the presence of a dense QCD medium, is found in semi-central collisions.

  • measurement of Charged Jet production cross sections and nuclear modification in p pb collisions at snn 5 02 tev
    Physics Letters B, 2015
    Co-Authors: J Adam, D Adamova, M M Aggarwal, M Agnello, Nikita Agrawal, Z Ahammed, Aglieri G Rinella, Sang Un Ahn, I Aimo, S Aiola
    Abstract:

    Charged Jet production cross sections in p–Pb collisions at √sNN = 5.02 TeV measured with the ALICE detector at the LHC are presented. Using the anti-kT algorithm, Jets have been reconstructed in the central rapidity region from Charged particles with resolution parameters R = 0.2 and R = 0.4. The reconstructed Jets have been corrected for detector effects and the underlying event background. To calculate the nuclear modification factor, RpPb, of Charged Jets in p–Pb collisions, a pp reference was constructed by scaling previously measured Charged Jet spectra at √s = 7 TeV. In the transverse momentum range 20 ≤ pT, ch Jet ≤ 120 GeV/c, RpPb is found to be consistent with unity, indicating the absence of strong nuclear matter effects on Jet production. Major modifications to the radial Jet structure are probed via the ratio of Jet production cross sections reconstructed with the two different resolution parameters. This ratio is found to be similar to the measurement in pp collisions at √s = 7 TeV and to the expectations from PYTHIA pp simulations and NLO pQCD calculations at √sNN = 5.02 TeV.

M Agnello - One of the best experts on this subject based on the ideXlab platform.

  • measurement of Charged Jet cross section in pp collisions at s 5 02 tev
    Physical Review D, 2019
    Co-Authors: Shreyasi Acharya, D Adamova, Jonatan Adolfsson, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Souvik Priyam Adhya, Alexander Adler, Z Ahammed
    Abstract:

    The cross section of Jets reconstructed from Charged particles is measured in the transverse momentum range of 5collisions at the center-of-mass energy of s=5.02  TeV with the ALICE detector. The Jets are reconstructed using the anti-kT algorithm with resolution parameters R=0.2, 0.3, 0.4, and 0.6 in the pseudorapidity range |η|<0.9-R. The Charged Jet cross sections are compared with the leading-order (LO) and to next-to-leading-order (NLO) perturbative quantum chromodynamics (pQCD) calculations. It is found that the NLO calculations agree better with the measurements. The cross section ratios for different resolution parameters are also measured. These ratios increase from low pT to high pT and saturate at high pT, indicating that Jet collimation is larger at high pT than at low pT. These results provide a precision test of pQCD predictions and serve as a baseline for the measurement in Pb-Pb collisions at the same energy to quantify the effects of the hot and dense medium created in heavy-ion collisions at the LHC.

  • Charged Jet cross section and fragmentation in proton proton collisions at s 7 tev
    Physical Review D, 2019
    Co-Authors: Shreyasi Acharya, D Adamova, C Adler, Jonatan Adolfsson, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Z Ahammed
    Abstract:

    We report the differential Charged Jet cross section and Jet fragmentation distributions measured with the ALICE detector in proton- proton collisions at a center-of-mass energy s=7 TeV. Jets with pseudorapidity |η| 40 GeV/c, the pythia calculations also agree with the measured Charged Jet cross section. pythia6 simulations describe the fragmentation distributions to 15%. Larger discrepancies are observed for pythia8.

  • centrality dependence of Charged Jet production in p pb collisions at snn 5 02 tev
    European Physical Journal C, 2016
    Co-Authors: J Adam, D Adamova, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Z Ahammed, Sang Un Ahn, S Ahmad, S Aiola
    Abstract:

    Measurements of Charged Jet production as a function of centrality are presented for  p-Pb  collisions recorded at [Formula: see text] TeV with the ALICE detector. Centrality classes are determined via the energy deposit in neutron calorimeters at zero degree, close to the beam direction, to minimise dynamical biases of the selection. The corresponding number of participants or binary nucleon-nucleon collisions is determined based on the particle production in the Pb-going rapidity region. Jets have been reconstructed in the central rapidity region from Charged particles with the anti-[Formula: see text] algorithm for resolution parameters [Formula: see text] and [Formula: see text] in the transverse momentum range 20 to 120 GeV/c. The reconstructed Jet momentum and yields have been corrected for detector effects and underlying-event background. In the five centrality bins considered, the Charged Jet production in  p-Pb   collisions is consistent with the production expected from binary scaling from pp collisions. The ratio of Jet yields reconstructed with the two different resolution parameters is also independent of the centrality selection, demonstrating the absence of major modifications of the radial Jet structure in the reported centrality classes.

  • azimuthal anisotropy of Charged Jet production in snn 2 76 tev pb pb collisions
    Physics Letters B, 2016
    Co-Authors: J Adam, D Adamova, M M Aggarwal, M Agnello, Z Ahammed, Aglieri G Rinella, Neelima Agrawal, Sang Un Ahn, S Aiola, A Akindinov
    Abstract:

    We present measurements of the azimuthal dependence of Charged Jet production in central and semicentral √sNN = 2.76 TeV Pb–Pb collisions with respect to the second harmonic event plane, quantified as vch Jet 2 . Jet finding is performed employing the anti-kT algorithm with a resolution parameter R = 0.2 using Charged tracks from the ALICE tracking system. The contribution of the azimuthal anisotropy of the underlying event is taken into account event-by-event. The remaining (statistical) region-to-region fluctuations are removed on an ensemble basis by unfolding the Jet spectra for different event plane orientations independently. Significant non-zero vch Jet 2 is observed in semi-central collisions (30–50% centrality) for 20 < pch Jet T < 90 GeV/c. The azimuthal dependence of the Charged Jet production is similar to the dependence observed for Jets comprising both Charged and neutral fragments, and compatible with measurements of the v2 of single Charged particles at high pT. Good agreement between the data and predictions from JEWEL, an event generator simulating parton shower evolution in the presence of a dense QCD medium, is found in semi-central collisions.

  • Charged Jet cross sections and properties in proton proton collisions at root s 7 tev
    Physical Review D, 2015
    Co-Authors: Betty Abelev, D Adamova, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, J Adam, Andrea Agostinelli, Saul Aguilar Salazar, N Ahmad
    Abstract:

    The differential Charged Jet cross sections, Jet fragmentation distributions, and Jet shapes are measured in minimum bias proton-proton collisions at center-of-mass energy root s = 7 TeV using the ALICE detector at the LHC. Jets are reconstructed from Charged particle momenta in the midrapidity region using the sequential recombination k(T) and anti-k(T) as well as the SISCone Jet finding algorithms with several resolution parameters in the range R = 0.2-0.6. Differential Jet production cross sections measured with the three Jet finders are in agreement in the transverse momentum (p(T)) interval 20 ) of the reconstructed Jet p(T). The fragmentation of leading Jets with R = 0.4 using scaled p(T) spectra of the Jet constituents is studied. The measurements are compared to model calculations from event generators (PYTHIA, PHOJet, HERWIG). The measured radial density distributions and distributions are well described by the PYTHIA model (tune Perugia-2011). The fragmentation distributions are better described by HERWIG.

D Adamova - One of the best experts on this subject based on the ideXlab platform.

  • measurement of Charged Jet cross section in pp collisions at s 5 02 tev
    Physical Review D, 2019
    Co-Authors: Shreyasi Acharya, D Adamova, Jonatan Adolfsson, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Souvik Priyam Adhya, Alexander Adler, Z Ahammed
    Abstract:

    The cross section of Jets reconstructed from Charged particles is measured in the transverse momentum range of 5collisions at the center-of-mass energy of s=5.02  TeV with the ALICE detector. The Jets are reconstructed using the anti-kT algorithm with resolution parameters R=0.2, 0.3, 0.4, and 0.6 in the pseudorapidity range |η|<0.9-R. The Charged Jet cross sections are compared with the leading-order (LO) and to next-to-leading-order (NLO) perturbative quantum chromodynamics (pQCD) calculations. It is found that the NLO calculations agree better with the measurements. The cross section ratios for different resolution parameters are also measured. These ratios increase from low pT to high pT and saturate at high pT, indicating that Jet collimation is larger at high pT than at low pT. These results provide a precision test of pQCD predictions and serve as a baseline for the measurement in Pb-Pb collisions at the same energy to quantify the effects of the hot and dense medium created in heavy-ion collisions at the LHC.

  • Charged Jet cross section and fragmentation in proton proton collisions at s 7 tev
    Physical Review D, 2019
    Co-Authors: Shreyasi Acharya, D Adamova, C Adler, Jonatan Adolfsson, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Z Ahammed
    Abstract:

    We report the differential Charged Jet cross section and Jet fragmentation distributions measured with the ALICE detector in proton- proton collisions at a center-of-mass energy s=7 TeV. Jets with pseudorapidity |η| 40 GeV/c, the pythia calculations also agree with the measured Charged Jet cross section. pythia6 simulations describe the fragmentation distributions to 15%. Larger discrepancies are observed for pythia8.

  • centrality dependence of Charged Jet production in p pb collisions at snn 5 02 tev
    European Physical Journal C, 2016
    Co-Authors: J Adam, D Adamova, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Z Ahammed, Sang Un Ahn, S Ahmad, S Aiola
    Abstract:

    Measurements of Charged Jet production as a function of centrality are presented for  p-Pb  collisions recorded at [Formula: see text] TeV with the ALICE detector. Centrality classes are determined via the energy deposit in neutron calorimeters at zero degree, close to the beam direction, to minimise dynamical biases of the selection. The corresponding number of participants or binary nucleon-nucleon collisions is determined based on the particle production in the Pb-going rapidity region. Jets have been reconstructed in the central rapidity region from Charged particles with the anti-[Formula: see text] algorithm for resolution parameters [Formula: see text] and [Formula: see text] in the transverse momentum range 20 to 120 GeV/c. The reconstructed Jet momentum and yields have been corrected for detector effects and underlying-event background. In the five centrality bins considered, the Charged Jet production in  p-Pb   collisions is consistent with the production expected from binary scaling from pp collisions. The ratio of Jet yields reconstructed with the two different resolution parameters is also independent of the centrality selection, demonstrating the absence of major modifications of the radial Jet structure in the reported centrality classes.

  • azimuthal anisotropy of Charged Jet production in snn 2 76 tev pb pb collisions
    Physics Letters B, 2016
    Co-Authors: J Adam, D Adamova, M M Aggarwal, M Agnello, Z Ahammed, Aglieri G Rinella, Neelima Agrawal, Sang Un Ahn, S Aiola, A Akindinov
    Abstract:

    We present measurements of the azimuthal dependence of Charged Jet production in central and semicentral √sNN = 2.76 TeV Pb–Pb collisions with respect to the second harmonic event plane, quantified as vch Jet 2 . Jet finding is performed employing the anti-kT algorithm with a resolution parameter R = 0.2 using Charged tracks from the ALICE tracking system. The contribution of the azimuthal anisotropy of the underlying event is taken into account event-by-event. The remaining (statistical) region-to-region fluctuations are removed on an ensemble basis by unfolding the Jet spectra for different event plane orientations independently. Significant non-zero vch Jet 2 is observed in semi-central collisions (30–50% centrality) for 20 < pch Jet T < 90 GeV/c. The azimuthal dependence of the Charged Jet production is similar to the dependence observed for Jets comprising both Charged and neutral fragments, and compatible with measurements of the v2 of single Charged particles at high pT. Good agreement between the data and predictions from JEWEL, an event generator simulating parton shower evolution in the presence of a dense QCD medium, is found in semi-central collisions.

  • Charged Jet cross sections and properties in proton proton collisions at root s 7 tev
    Physical Review D, 2015
    Co-Authors: Betty Abelev, D Adamova, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, J Adam, Andrea Agostinelli, Saul Aguilar Salazar, N Ahmad
    Abstract:

    The differential Charged Jet cross sections, Jet fragmentation distributions, and Jet shapes are measured in minimum bias proton-proton collisions at center-of-mass energy root s = 7 TeV using the ALICE detector at the LHC. Jets are reconstructed from Charged particle momenta in the midrapidity region using the sequential recombination k(T) and anti-k(T) as well as the SISCone Jet finding algorithms with several resolution parameters in the range R = 0.2-0.6. Differential Jet production cross sections measured with the three Jet finders are in agreement in the transverse momentum (p(T)) interval 20 ) of the reconstructed Jet p(T). The fragmentation of leading Jets with R = 0.4 using scaled p(T) spectra of the Jet constituents is studied. The measurements are compared to model calculations from event generators (PYTHIA, PHOJet, HERWIG). The measured radial density distributions and distributions are well described by the PYTHIA model (tune Perugia-2011). The fragmentation distributions are better described by HERWIG.

M M Aggarwal - One of the best experts on this subject based on the ideXlab platform.

  • measurement of Charged Jet cross section in pp collisions at s 5 02 tev
    Physical Review D, 2019
    Co-Authors: Shreyasi Acharya, D Adamova, Jonatan Adolfsson, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Souvik Priyam Adhya, Alexander Adler, Z Ahammed
    Abstract:

    The cross section of Jets reconstructed from Charged particles is measured in the transverse momentum range of 5collisions at the center-of-mass energy of s=5.02  TeV with the ALICE detector. The Jets are reconstructed using the anti-kT algorithm with resolution parameters R=0.2, 0.3, 0.4, and 0.6 in the pseudorapidity range |η|<0.9-R. The Charged Jet cross sections are compared with the leading-order (LO) and to next-to-leading-order (NLO) perturbative quantum chromodynamics (pQCD) calculations. It is found that the NLO calculations agree better with the measurements. The cross section ratios for different resolution parameters are also measured. These ratios increase from low pT to high pT and saturate at high pT, indicating that Jet collimation is larger at high pT than at low pT. These results provide a precision test of pQCD predictions and serve as a baseline for the measurement in Pb-Pb collisions at the same energy to quantify the effects of the hot and dense medium created in heavy-ion collisions at the LHC.

  • Charged Jet cross section and fragmentation in proton proton collisions at s 7 tev
    Physical Review D, 2019
    Co-Authors: Shreyasi Acharya, D Adamova, C Adler, Jonatan Adolfsson, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Z Ahammed
    Abstract:

    We report the differential Charged Jet cross section and Jet fragmentation distributions measured with the ALICE detector in proton- proton collisions at a center-of-mass energy s=7 TeV. Jets with pseudorapidity |η| 40 GeV/c, the pythia calculations also agree with the measured Charged Jet cross section. pythia6 simulations describe the fragmentation distributions to 15%. Larger discrepancies are observed for pythia8.

  • centrality dependence of Charged Jet production in p pb collisions at snn 5 02 tev
    European Physical Journal C, 2016
    Co-Authors: J Adam, D Adamova, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Z Ahammed, Sang Un Ahn, S Ahmad, S Aiola
    Abstract:

    Measurements of Charged Jet production as a function of centrality are presented for  p-Pb  collisions recorded at [Formula: see text] TeV with the ALICE detector. Centrality classes are determined via the energy deposit in neutron calorimeters at zero degree, close to the beam direction, to minimise dynamical biases of the selection. The corresponding number of participants or binary nucleon-nucleon collisions is determined based on the particle production in the Pb-going rapidity region. Jets have been reconstructed in the central rapidity region from Charged particles with the anti-[Formula: see text] algorithm for resolution parameters [Formula: see text] and [Formula: see text] in the transverse momentum range 20 to 120 GeV/c. The reconstructed Jet momentum and yields have been corrected for detector effects and underlying-event background. In the five centrality bins considered, the Charged Jet production in  p-Pb   collisions is consistent with the production expected from binary scaling from pp collisions. The ratio of Jet yields reconstructed with the two different resolution parameters is also independent of the centrality selection, demonstrating the absence of major modifications of the radial Jet structure in the reported centrality classes.

  • azimuthal anisotropy of Charged Jet production in snn 2 76 tev pb pb collisions
    Physics Letters B, 2016
    Co-Authors: J Adam, D Adamova, M M Aggarwal, M Agnello, Z Ahammed, Aglieri G Rinella, Neelima Agrawal, Sang Un Ahn, S Aiola, A Akindinov
    Abstract:

    We present measurements of the azimuthal dependence of Charged Jet production in central and semicentral √sNN = 2.76 TeV Pb–Pb collisions with respect to the second harmonic event plane, quantified as vch Jet 2 . Jet finding is performed employing the anti-kT algorithm with a resolution parameter R = 0.2 using Charged tracks from the ALICE tracking system. The contribution of the azimuthal anisotropy of the underlying event is taken into account event-by-event. The remaining (statistical) region-to-region fluctuations are removed on an ensemble basis by unfolding the Jet spectra for different event plane orientations independently. Significant non-zero vch Jet 2 is observed in semi-central collisions (30–50% centrality) for 20 < pch Jet T < 90 GeV/c. The azimuthal dependence of the Charged Jet production is similar to the dependence observed for Jets comprising both Charged and neutral fragments, and compatible with measurements of the v2 of single Charged particles at high pT. Good agreement between the data and predictions from JEWEL, an event generator simulating parton shower evolution in the presence of a dense QCD medium, is found in semi-central collisions.

  • Charged Jet cross sections and properties in proton proton collisions at root s 7 tev
    Physical Review D, 2015
    Co-Authors: Betty Abelev, D Adamova, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, J Adam, Andrea Agostinelli, Saul Aguilar Salazar, N Ahmad
    Abstract:

    The differential Charged Jet cross sections, Jet fragmentation distributions, and Jet shapes are measured in minimum bias proton-proton collisions at center-of-mass energy root s = 7 TeV using the ALICE detector at the LHC. Jets are reconstructed from Charged particle momenta in the midrapidity region using the sequential recombination k(T) and anti-k(T) as well as the SISCone Jet finding algorithms with several resolution parameters in the range R = 0.2-0.6. Differential Jet production cross sections measured with the three Jet finders are in agreement in the transverse momentum (p(T)) interval 20 ) of the reconstructed Jet p(T). The fragmentation of leading Jets with R = 0.4 using scaled p(T) spectra of the Jet constituents is studied. The measurements are compared to model calculations from event generators (PYTHIA, PHOJet, HERWIG). The measured radial density distributions and distributions are well described by the PYTHIA model (tune Perugia-2011). The fragmentation distributions are better described by HERWIG.

J Adam - One of the best experts on this subject based on the ideXlab platform.

  • centrality dependence of Charged Jet production in p pb collisions at snn 5 02 tev
    European Physical Journal C, 2016
    Co-Authors: J Adam, D Adamova, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, Z Ahammed, Sang Un Ahn, S Ahmad, S Aiola
    Abstract:

    Measurements of Charged Jet production as a function of centrality are presented for  p-Pb  collisions recorded at [Formula: see text] TeV with the ALICE detector. Centrality classes are determined via the energy deposit in neutron calorimeters at zero degree, close to the beam direction, to minimise dynamical biases of the selection. The corresponding number of participants or binary nucleon-nucleon collisions is determined based on the particle production in the Pb-going rapidity region. Jets have been reconstructed in the central rapidity region from Charged particles with the anti-[Formula: see text] algorithm for resolution parameters [Formula: see text] and [Formula: see text] in the transverse momentum range 20 to 120 GeV/c. The reconstructed Jet momentum and yields have been corrected for detector effects and underlying-event background. In the five centrality bins considered, the Charged Jet production in  p-Pb   collisions is consistent with the production expected from binary scaling from pp collisions. The ratio of Jet yields reconstructed with the two different resolution parameters is also independent of the centrality selection, demonstrating the absence of major modifications of the radial Jet structure in the reported centrality classes.

  • azimuthal anisotropy of Charged Jet production in snn 2 76 tev pb pb collisions
    Physics Letters B, 2016
    Co-Authors: J Adam, D Adamova, M M Aggarwal, M Agnello, Z Ahammed, Aglieri G Rinella, Neelima Agrawal, Sang Un Ahn, S Aiola, A Akindinov
    Abstract:

    We present measurements of the azimuthal dependence of Charged Jet production in central and semicentral √sNN = 2.76 TeV Pb–Pb collisions with respect to the second harmonic event plane, quantified as vch Jet 2 . Jet finding is performed employing the anti-kT algorithm with a resolution parameter R = 0.2 using Charged tracks from the ALICE tracking system. The contribution of the azimuthal anisotropy of the underlying event is taken into account event-by-event. The remaining (statistical) region-to-region fluctuations are removed on an ensemble basis by unfolding the Jet spectra for different event plane orientations independently. Significant non-zero vch Jet 2 is observed in semi-central collisions (30–50% centrality) for 20 < pch Jet T < 90 GeV/c. The azimuthal dependence of the Charged Jet production is similar to the dependence observed for Jets comprising both Charged and neutral fragments, and compatible with measurements of the v2 of single Charged particles at high pT. Good agreement between the data and predictions from JEWEL, an event generator simulating parton shower evolution in the presence of a dense QCD medium, is found in semi-central collisions.

  • Charged Jet cross sections and properties in proton proton collisions at root s 7 tev
    Physical Review D, 2015
    Co-Authors: Betty Abelev, D Adamova, M M Aggarwal, Gianluca Aglieri Rinella, M Agnello, Nikita Agrawal, J Adam, Andrea Agostinelli, Saul Aguilar Salazar, N Ahmad
    Abstract:

    The differential Charged Jet cross sections, Jet fragmentation distributions, and Jet shapes are measured in minimum bias proton-proton collisions at center-of-mass energy root s = 7 TeV using the ALICE detector at the LHC. Jets are reconstructed from Charged particle momenta in the midrapidity region using the sequential recombination k(T) and anti-k(T) as well as the SISCone Jet finding algorithms with several resolution parameters in the range R = 0.2-0.6. Differential Jet production cross sections measured with the three Jet finders are in agreement in the transverse momentum (p(T)) interval 20 ) of the reconstructed Jet p(T). The fragmentation of leading Jets with R = 0.4 using scaled p(T) spectra of the Jet constituents is studied. The measurements are compared to model calculations from event generators (PYTHIA, PHOJet, HERWIG). The measured radial density distributions and distributions are well described by the PYTHIA model (tune Perugia-2011). The fragmentation distributions are better described by HERWIG.

  • measurement of Charged Jet production cross sections and nuclear modification in p pb collisions at snn 5 02 tev
    Physics Letters B, 2015
    Co-Authors: J Adam, D Adamova, M M Aggarwal, M Agnello, Nikita Agrawal, Z Ahammed, Aglieri G Rinella, Sang Un Ahn, I Aimo, S Aiola
    Abstract:

    Charged Jet production cross sections in p–Pb collisions at √sNN = 5.02 TeV measured with the ALICE detector at the LHC are presented. Using the anti-kT algorithm, Jets have been reconstructed in the central rapidity region from Charged particles with resolution parameters R = 0.2 and R = 0.4. The reconstructed Jets have been corrected for detector effects and the underlying event background. To calculate the nuclear modification factor, RpPb, of Charged Jets in p–Pb collisions, a pp reference was constructed by scaling previously measured Charged Jet spectra at √s = 7 TeV. In the transverse momentum range 20 ≤ pT, ch Jet ≤ 120 GeV/c, RpPb is found to be consistent with unity, indicating the absence of strong nuclear matter effects on Jet production. Major modifications to the radial Jet structure are probed via the ratio of Jet production cross sections reconstructed with the two different resolution parameters. This ratio is found to be similar to the measurement in pp collisions at √s = 7 TeV and to the expectations from PYTHIA pp simulations and NLO pQCD calculations at √sNN = 5.02 TeV.

  • measurement of Charged Jet suppression in pb pb collisions at snn 2 76 tev
    Web Science, 2014
    Co-Authors: B Abelev, D Adamova, M M Aggarwal, M Agnello, J Adam, Aglieri G Rinella, A G Agocs, A Agostinelli, Neelima Agrawal
    Abstract:

    A measurement of the transverse momentum spectra of Jets in Pb-Pb collisions at √sNN = 2.76TeV is reported. Jets are reconstructed from Charged particles using the anti-k T Jet algorithm with Jet resolution parameters R of 0.2 and 0.3 in pseudo-rapidity |η| < 0.5. The transverse momentum p T of Charged particles is measured down to 0.15 GeV/c which gives access to the low p T fragments of the Jet. Jets found in heavy-ion collisions are corrected event-by-event for average background density and on an inclusive basis (via unfolding) for residual background fluctuations and detector effects. A strong suppression of Jet production in central events with respect to peripheral events is observed. The suppression is found to be similar to the suppression of Charged hadrons, which suggests that substantial energy is radiated at angles larger than the Jet resolution parameter R = 0.3 considered in the analysis. The fragmentation bias introduced by selecting Jets with a high p T leading particle, which rejects Jets with a soft fragmentation pattern, has a similar effect on the Jet yield for central and peripheral events. The ratio of Jet spectra with R = 0.2 and R = 0.3 is found to be similar in Pb-Pb and simulated PYTHIA pp events, indicating no strong broadening of the radial Jet structure in the reconstructed Jets with R < 0.3. [Figure not available: see fulltext.] © 2014 The Author(s).