D. Mayani - Academia.edu (original) (raw)
Papers by D. Mayani
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010
... d Universita degli Studi di Bari, Dipartimento Interateneo di Fisica M.Melin &a... more ... d Universita degli Studi di Bari, Dipartimento Interateneo di Fisica M.Melin & INFN Sezione di Bari, Bari, Italy. ... We propose to construct and install a limited acceptance detector to identify hadrons (pions, K, p) up to 30 GeV/c on a track-by-track basis in space available in ALICE. ...
Journal of Instrumentation, 2010
Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-... more Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 µm in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from protonproton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10 5 charged tracks from cosmic rays that have been collected during summer 2008, with the ALICE solenoidal magnet switched off.
Physics Letters B, 2013
The elliptic, v2, triangular, v3, and quadrangular, v4, azimuthal anisotropic flow coefficients a... more The elliptic, v2, triangular, v3, and quadrangular, v4, azimuthal anisotropic flow coefficients are measured for unidentified charged particles, pions, and (anti-) protons in Pb–Pb collisions at sNN= 2.76 TeV with the ALICE detector at the Large Hadron Collider. Results obtained with the event plane and four-particle cumulant methods are reported for the pseudo-rapidity range| η|< 0.8 at different collision centralities and as a function of transverse momentum, pT, out to pT= 20 GeV/c. The observed non-zero elliptic and ...
The European Physical Journal Plus, 2014
The construction of a new detector is proposed to extend the capabilities of ALICE in the high tr... more The construction of a new detector is proposed to extend the capabilities of ALICE in the high transverse momentum (pT) region. This Very High Momentum Particle Identification Detector (VHMPID) performs charged hadron identification on a track-by-track basis in the 5 GeV/c < p < 25 GeV/c momentum range and provides ALICE with new opportunities to study parton-medium interactions at LHC arXiv:1309.5880v2 [nucl-ex] 24 Sep 2013 2 T. V. Acconcia et al.: A Very High Momentum Particle Identification Detector energies. The VHMPID covers up to 30% of the ALICE central barrel and presents sufficient acceptance for triggered-and tagged-jet studies, allowing for the first time identified charged hadron measurements in jets. This Letter of Intent summarizes the physics motivations for such a detector as well as its layout and integration into ALICE. PACS. 29.40.Ka Cherenkov detectors -25.75.-q Relativistic heavy-ion collisions ./
EPJ Web of Conferences, 2011
This article presents the basic idea of VHMPID, an upgrade detector for the ALICE experiment at L... more This article presents the basic idea of VHMPID, an upgrade detector for the ALICE experiment at LHC, CERN. The main goal of this detector is to extend the particle identification capabilities of ALICE to give more insight into the evolution of the hot and dense matter created in Pb-Pb collisions. Starting from the physics motivations and working principles the challenges and current status of development is detailed.
Physical review letters, Jan 24, 2012
The ALICE Collaboration has studied J/ψ production in pp collisions at √s=7 TeV at the LHC throug... more The ALICE Collaboration has studied J/ψ production in pp collisions at √s=7 TeV at the LHC through its muon pair decay. The polar and azimuthal angle distributions of the decay muons were measured, and results on the J/ψ polarization parameters λ(θ) and λ(φ) were obtained. The study was performed in the kinematic region 2.5<y<4, 2<p(t)<8 GeV/c, in the helicity and Collins-Soper reference frames. In both frames, the polarization parameters are compatible with zero, within uncertainties.
Journal of High Energy Physics, 2012
The p t -differential inclusive production cross sections of the prompt charmed mesons D 0 , D + ... more The p t -differential inclusive production cross sections of the prompt charmed mesons D 0 , D + , and D * + in the rapidity range |y| < 0.5 were measured in proton-proton collisions at √ s = 7 TeV at the LHC using the ALICE detector. Reconstructing the decays D 0 → K − π + , D + → K − π + π + , D * + → D 0 π + , and their charge conjugates, about 8,400 D 0 , 2,900 D + , and 2,600 D * + mesons with 1 < p t < 24 GeV/c were counted, after selection cuts, in a data sample of 3.14 × 10 8 events collected with a minimum-bias trigger (integrated luminosity L int = 5 nb −1 ). The results are described within uncertainties by predictions based on perturbative QCD.
Journal of High Energy Physics, 2012
Physics Letters B, 2011
... Grion cl , P. Gros bt , JF Grosse-Oetringhaus f , J.-Y. Grossiord bq , R. Grosso y , F. Guber... more ... Grion cl , P. Gros bt , JF Grosse-Oetringhaus f , J.-Y. Grossiord bq , R. Grosso y , F. Guber ck , R. Guernane ac , C. Guerra Gutierrez bo , B. Guerzoni ... Ladrón de Guevara ba , 26 , V. Lafage bg , C. Lara v , DT Larsen a , C. Lazzeroni an , Y. Le Bornec bg , R. Lea bi , KS Lee k , SC ...
Physics Letters B, 2011
The ALICE experiment at the LHC has studied inclusive J/ψ production at central and forward rapid... more The ALICE experiment at the LHC has studied inclusive J/ψ production at central and forward rapidities in pp collisions at √ s = 7 TeV. In this Letter, we report on the first results obtained detecting the J/ψ through the dilepton decay into e + e − and µ + µ − pairs in the rapidity ranges |y| < 0.9 and 2.5 < y < 4, respectively, and with acceptance down to zero p T . In the dielectron channel the analysis was carried out on a data sample corresponding to an integrated luminosity L int = 5.6 nb −1 and the number of signal events is N J/ψ = 352 ± 32 (stat.) ± 28 (syst.); the corresponding figures in the dimuon channel are L int = 15.6 nb −1 and N J/ψ = 1924 ± 77 (stat.) ± 144 (syst.). The measured production cross sections are σ J/ψ (|y| < 0.9) = 12.4 ± 1.1 (stat.) ± 1.8 (syst.) +1.8 −2.7 (syst.pol.) µb and σ J/ψ (2.5 < y < 4) = 6.31 ± 0.25 (stat.) ± 0.76 (syst.) +0.95 −1.96 (syst.pol.) µb. The differential cross sections, in transverse momentum and rapidity, of the J/ψ were also measured.
Physics Letters B, 2012
ABSTRACT The ALICE Collaboration has measured inclusive J/psi production in pp collisions at a ce... more ABSTRACT The ALICE Collaboration has measured inclusive J/psi production in pp collisions at a center-of-mass energy root s = 2.76 TeV at the LHC. The results presented in this Letter refer to the rapidity ranges vertical bar y vertical bar < 0.9 and 2.5 < y <4 and have been obtained by measuring the electron and muon pair decay channels, respectively. The integrated luminosities for the two channels are L-int(e) = 1.1 nb(-1) and L-int(mu) = 19.9 nb(-1), and the corresponding signal statistics are N-J/psi(e+e-) = 59 +/- 14 and N-J/psi(mu+mu-) = 1364 +/- 53. We present d sigma(J/psi)/dy for the two rapidity regions under study and, for the forward-y range, d(2)sigma(J/psi)/dydp(t) in the transverse momentum domain 0 < p(t) < 8 GeV/c. The results are compared with previously published results at root s = 7 TeV and with theoretical calculations. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
Physics Letters B, 2012
.ALICE Collaboration a r t i c l e i n f o a b s t r a c t
Physics Letters B, 2010
The inclusive charged particle transverse momentum distribution is measured in proton-proton coll... more The inclusive charged particle transverse momentum distribution is measured in proton-proton collisions at √ s = 900 GeV at the LHC using the ALICE detector. The measurement is performed in the central pseudorapidity region (|η| < 0.8) over the transverse momentum range 0.15 < p T < 10 GeV/c. The correlation between transverse momentum and particle multiplicity is also studied. Results are presented for inelastic (INEL) and non-single-diffractive (NSD) events. The average transverse momentum for |η| < 0.8 is p T INEL = 0.483±0.001 (stat.) ±0.007 (syst.) GeV/c and p T NSD = 0.489 ± 0.001 (stat.) ±0.007 (syst.) GeV/c, respectively. The data exhibit a slightly larger p T than measurements in wider pseudorapidity intervals. The results are compared to simulations with the Monte Carlo event generators PYTHIA and PHOJET.
Physics Letters B, 2012
Hub; ScienceDirect; Scopus; Applications. Register; Login Login; Go to SciVal Suite. Username: Pa... more Hub; ScienceDirect; Scopus; Applications. Register; Login Login; Go to SciVal Suite. Username: Password: Remember me. | Not Registered? Forgotten your username or password? Go to Athens / Institution login. Home; Publications; Search; My settings; My alerts. Help. Export citation. PDF (1029 K). More options... Email article. Signed up for journal alerts [remove]. Alert me about new articles in this journal. Your selection(s) could not be saved due to an internal error. Please try again. Show thumbnail images. Search. ...
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010
... d Universita degli Studi di Bari, Dipartimento Interateneo di Fisica M.Melin &amp;a... more ... d Universita degli Studi di Bari, Dipartimento Interateneo di Fisica M.Melin &amp;amp;amp; INFN Sezione di Bari, Bari, Italy. ... We propose to construct and install a limited acceptance detector to identify hadrons (pions, K, p) up to 30 GeV/c on a track-by-track basis in space available in ALICE. ...
Journal of Instrumentation, 2010
Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-... more Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 µm in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from protonproton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10 5 charged tracks from cosmic rays that have been collected during summer 2008, with the ALICE solenoidal magnet switched off.
Physics Letters B, 2013
The elliptic, v2, triangular, v3, and quadrangular, v4, azimuthal anisotropic flow coefficients a... more The elliptic, v2, triangular, v3, and quadrangular, v4, azimuthal anisotropic flow coefficients are measured for unidentified charged particles, pions, and (anti-) protons in Pb–Pb collisions at sNN= 2.76 TeV with the ALICE detector at the Large Hadron Collider. Results obtained with the event plane and four-particle cumulant methods are reported for the pseudo-rapidity range| η|< 0.8 at different collision centralities and as a function of transverse momentum, pT, out to pT= 20 GeV/c. The observed non-zero elliptic and ...
The European Physical Journal Plus, 2014
The construction of a new detector is proposed to extend the capabilities of ALICE in the high tr... more The construction of a new detector is proposed to extend the capabilities of ALICE in the high transverse momentum (pT) region. This Very High Momentum Particle Identification Detector (VHMPID) performs charged hadron identification on a track-by-track basis in the 5 GeV/c < p < 25 GeV/c momentum range and provides ALICE with new opportunities to study parton-medium interactions at LHC arXiv:1309.5880v2 [nucl-ex] 24 Sep 2013 2 T. V. Acconcia et al.: A Very High Momentum Particle Identification Detector energies. The VHMPID covers up to 30% of the ALICE central barrel and presents sufficient acceptance for triggered-and tagged-jet studies, allowing for the first time identified charged hadron measurements in jets. This Letter of Intent summarizes the physics motivations for such a detector as well as its layout and integration into ALICE. PACS. 29.40.Ka Cherenkov detectors -25.75.-q Relativistic heavy-ion collisions ./
EPJ Web of Conferences, 2011
This article presents the basic idea of VHMPID, an upgrade detector for the ALICE experiment at L... more This article presents the basic idea of VHMPID, an upgrade detector for the ALICE experiment at LHC, CERN. The main goal of this detector is to extend the particle identification capabilities of ALICE to give more insight into the evolution of the hot and dense matter created in Pb-Pb collisions. Starting from the physics motivations and working principles the challenges and current status of development is detailed.
Physical review letters, Jan 24, 2012
The ALICE Collaboration has studied J/ψ production in pp collisions at √s=7 TeV at the LHC throug... more The ALICE Collaboration has studied J/ψ production in pp collisions at √s=7 TeV at the LHC through its muon pair decay. The polar and azimuthal angle distributions of the decay muons were measured, and results on the J/ψ polarization parameters λ(θ) and λ(φ) were obtained. The study was performed in the kinematic region 2.5<y<4, 2<p(t)<8 GeV/c, in the helicity and Collins-Soper reference frames. In both frames, the polarization parameters are compatible with zero, within uncertainties.
Journal of High Energy Physics, 2012
The p t -differential inclusive production cross sections of the prompt charmed mesons D 0 , D + ... more The p t -differential inclusive production cross sections of the prompt charmed mesons D 0 , D + , and D * + in the rapidity range |y| < 0.5 were measured in proton-proton collisions at √ s = 7 TeV at the LHC using the ALICE detector. Reconstructing the decays D 0 → K − π + , D + → K − π + π + , D * + → D 0 π + , and their charge conjugates, about 8,400 D 0 , 2,900 D + , and 2,600 D * + mesons with 1 < p t < 24 GeV/c were counted, after selection cuts, in a data sample of 3.14 × 10 8 events collected with a minimum-bias trigger (integrated luminosity L int = 5 nb −1 ). The results are described within uncertainties by predictions based on perturbative QCD.
Journal of High Energy Physics, 2012
Physics Letters B, 2011
... Grion cl , P. Gros bt , JF Grosse-Oetringhaus f , J.-Y. Grossiord bq , R. Grosso y , F. Guber... more ... Grion cl , P. Gros bt , JF Grosse-Oetringhaus f , J.-Y. Grossiord bq , R. Grosso y , F. Guber ck , R. Guernane ac , C. Guerra Gutierrez bo , B. Guerzoni ... Ladrón de Guevara ba , 26 , V. Lafage bg , C. Lara v , DT Larsen a , C. Lazzeroni an , Y. Le Bornec bg , R. Lea bi , KS Lee k , SC ...
Physics Letters B, 2011
The ALICE experiment at the LHC has studied inclusive J/ψ production at central and forward rapid... more The ALICE experiment at the LHC has studied inclusive J/ψ production at central and forward rapidities in pp collisions at √ s = 7 TeV. In this Letter, we report on the first results obtained detecting the J/ψ through the dilepton decay into e + e − and µ + µ − pairs in the rapidity ranges |y| < 0.9 and 2.5 < y < 4, respectively, and with acceptance down to zero p T . In the dielectron channel the analysis was carried out on a data sample corresponding to an integrated luminosity L int = 5.6 nb −1 and the number of signal events is N J/ψ = 352 ± 32 (stat.) ± 28 (syst.); the corresponding figures in the dimuon channel are L int = 15.6 nb −1 and N J/ψ = 1924 ± 77 (stat.) ± 144 (syst.). The measured production cross sections are σ J/ψ (|y| < 0.9) = 12.4 ± 1.1 (stat.) ± 1.8 (syst.) +1.8 −2.7 (syst.pol.) µb and σ J/ψ (2.5 < y < 4) = 6.31 ± 0.25 (stat.) ± 0.76 (syst.) +0.95 −1.96 (syst.pol.) µb. The differential cross sections, in transverse momentum and rapidity, of the J/ψ were also measured.
Physics Letters B, 2012
ABSTRACT The ALICE Collaboration has measured inclusive J/psi production in pp collisions at a ce... more ABSTRACT The ALICE Collaboration has measured inclusive J/psi production in pp collisions at a center-of-mass energy root s = 2.76 TeV at the LHC. The results presented in this Letter refer to the rapidity ranges vertical bar y vertical bar < 0.9 and 2.5 < y <4 and have been obtained by measuring the electron and muon pair decay channels, respectively. The integrated luminosities for the two channels are L-int(e) = 1.1 nb(-1) and L-int(mu) = 19.9 nb(-1), and the corresponding signal statistics are N-J/psi(e+e-) = 59 +/- 14 and N-J/psi(mu+mu-) = 1364 +/- 53. We present d sigma(J/psi)/dy for the two rapidity regions under study and, for the forward-y range, d(2)sigma(J/psi)/dydp(t) in the transverse momentum domain 0 < p(t) < 8 GeV/c. The results are compared with previously published results at root s = 7 TeV and with theoretical calculations. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.
Physics Letters B, 2012
.ALICE Collaboration a r t i c l e i n f o a b s t r a c t
Physics Letters B, 2010
The inclusive charged particle transverse momentum distribution is measured in proton-proton coll... more The inclusive charged particle transverse momentum distribution is measured in proton-proton collisions at √ s = 900 GeV at the LHC using the ALICE detector. The measurement is performed in the central pseudorapidity region (|η| < 0.8) over the transverse momentum range 0.15 < p T < 10 GeV/c. The correlation between transverse momentum and particle multiplicity is also studied. Results are presented for inelastic (INEL) and non-single-diffractive (NSD) events. The average transverse momentum for |η| < 0.8 is p T INEL = 0.483±0.001 (stat.) ±0.007 (syst.) GeV/c and p T NSD = 0.489 ± 0.001 (stat.) ±0.007 (syst.) GeV/c, respectively. The data exhibit a slightly larger p T than measurements in wider pseudorapidity intervals. The results are compared to simulations with the Monte Carlo event generators PYTHIA and PHOJET.
Physics Letters B, 2012
Hub; ScienceDirect; Scopus; Applications. Register; Login Login; Go to SciVal Suite. Username: Pa... more Hub; ScienceDirect; Scopus; Applications. Register; Login Login; Go to SciVal Suite. Username: Password: Remember me. | Not Registered? Forgotten your username or password? Go to Athens / Institution login. Home; Publications; Search; My settings; My alerts. Help. Export citation. PDF (1029 K). More options... Email article. Signed up for journal alerts [remove]. Alert me about new articles in this journal. Your selection(s) could not be saved due to an internal error. Please try again. Show thumbnail images. Search. ...