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Measurements Of The Charm Jet Cross Section And Nuclear Modification Factor In Ppb Collisions At Sqrtsnn
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Book Synopsis Measurements of the Charm Jet Cross Section and Nuclear Modification Factor in PPb Collisions at Sqrt(s[NN] by :
Download or read book Measurements of the Charm Jet Cross Section and Nuclear Modification Factor in PPb Collisions at Sqrt(s[NN] written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The CMS Collaboration presents the first measurement of the differential cross section of jets from charm quarks produced in proton-lead (pPb) collisions at a nucleon-nucleon center-of-mass energy of sqrt(s[NN]) = 5.02 TeV, as well as results from charm quark jets in proton-proton (pp) collisions at sqrt(s)= 2.76 and 5.02 TeV. By comparing the yields of the pPb and pp collision systems at the same energy, a nuclear modification factor for charm jets in pPb collisions at sqrt(s[NN]) = 5.02 TeV of R[pA] = 0.92 +/- 0.07 (stat) +/- 0.11 (syst) is obtained. This is consistent with an absence of final-state energy loss for charm quarks in pPb collisions. In addition, the fraction of jets coming from charm quarks is found to be consistent with that predicted by PYTHIA 6 for pp collisions at sqrt(s)= 2.76 and 5.02 TeV, and is independent of the jet transverse momentum from 55 to 400 GeV.
Book Synopsis Measurements of the Charm Jet Cross Section and Nuclear Modification Factor in PPb Collisions at √sNN by :
Download or read book Measurements of the Charm Jet Cross Section and Nuclear Modification Factor in PPb Collisions at √sNN written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Charged Jet Production Cross Sections and Nuclear Modification in P-Pb Collisions at [mml by :
Download or read book Measurement of Charged Jet Production Cross Sections and Nuclear Modification in P-Pb Collisions at [mml written by and published by . This book was released on 2015 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Charged jet production cross sections in p-Pb collisions at √s(NN) = 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, R-pPb, 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, R-pPb 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. In conclusion, 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 √s(NN) = 5.02 TeV.
Book Synopsis Measurement of Inclusive Jet Production and Nuclear Modifications in PPb Collisions at $\sqrt{s_{\mathrm{NN}}} by :
Download or read book Measurement of Inclusive Jet Production and Nuclear Modifications in PPb Collisions at $\sqrt{s_{\mathrm{NN}}} written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Inclusive jet production in pPb collisions at a nucleon-nucleon (NN) center-of-mass energy of sqrt(s[NN])=5.02 TeV is studied with the CMS detector at the LHC. A data sample corresponding to an integrated luminosity of 35 inverse nanobarns is analyzed. The jet transverse momentum spectra are studied in seven pseudorapidity intervals covering the range -2.0
Book Synopsis Measurements of the Nuclear Modification Factor for Jets in [math Display by :
Download or read book Measurements of the Nuclear Modification Factor for Jets in [math Display written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The measurements of inclusive jet production are performed in pp and Pb+Pb collisions at √sNN = 2.76 TeV with the ATLAS detector at the LHC, corresponding to integrated luminosities of 4.0 and 0.14 nb-1, respectively. The jets are identified with the anti-kt algorithm with R = 0.4, and the spectra are measured over the kinematic range of jet transverse momentum 32
Book Synopsis Measurement of Mid-rapidity Inclusive Jet Cross Section in Pp Collisions at √s by : Dmitrii Kalinkin
Download or read book Measurement of Mid-rapidity Inclusive Jet Cross Section in Pp Collisions at √s written by Dmitrii Kalinkin and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cross section for inclusive jet production in high-energy pp collisions is well described by pQCD in the collinear factorization framework, which, together with its high rate and clear signal, makes it a key observable to study the proton structure. For pp collisions at RHIC at a center-of-mass energy of √s = 200 GeV, the STAR detector provides jet measurements at 0.07 ≲ xT ≡ 2pT:jet/√s ≲ 0.5. At these kinematics, the direct scattering on gluons inside the colliding protons contributes at least half of the total jet production cross section. Measurements of the inclusive jet cross section at RHIC, together with the past Deep Inelastic Scattering measurements, can provide improved constraints on the gluon Parton Distribution Function at high x.
Book Synopsis Jetting Through the Primordial Universe by : Raghav Kunnawalkam Elayavalli
Download or read book Jetting Through the Primordial Universe written by Raghav Kunnawalkam Elayavalli and published by . This book was released on 2017 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collisions of heavy ion nuclei at relativistic speeds (close to the speed of light), sometimes referred to as the ``little bang", can recreate conditions similar to the early universe. This high temperature and very dense form of matter, now known to consist of de-confined quarks and gluons is named the quark gluon plasma (QGP). An early signature of the QGP, both theorized and seen in experiments, was the aspect of ``jet quenching" and understanding that phenomenon will be the main focus of this thesis. The concept behind quenching is that a high energetic quark or gluon jet undergoes significant energy loss due to the overall structure modifications related to its fragmentation and radiation patterns as it traverses the medium. The term jet, parameterized by a fixed lateral size or the jet radius, represents the collimated spray of particles arising from an initial parton. In this thesis, Run1 experimental data from pp and heavy ion collisions at the CERN LHC is analyzed with the CMS detector. Analysis steps involved in the measurement of the inclusive jet cross section in pp, pPb and PbPb systems are outlined in detail. The pp jet cross section is compared with next to leading order theoretical calculations supplemented with non perturbative corrections for three different jet radii highlighting better comparisons for larger radii jets. Measurement of the jet yield followed by the nuclear modification factors in proton-lead at 5.02 TeV and lead-lead collisions at 2.76 TeV are presented. Since pp data at 5.02 TeV was not available in Run1, an extrapolation method is performed to derive a reference pp spectra. A new data driven technique is introduced to estimate and correct for the fake jet contribution in PbPb for low transverse momenta jets. The nuclear modification factors studied in this thesis show jet quenching to be attributed to final state effects, have a strong correlation to the event centrality, a weak inverse correlation to the jet transverse momenta and an apparent independence on the jet radii in the kinematic range studied. These measurements are compared with leading theoretical model calculations and other experimental results at the LHC leading to unanimous agreement on the qualitative nature of jet quenching. This thesis also features novel updates to the Monte Carlo heavy ion event generator JEWEL (Jet Evolution With Energy Loss) including the boson-jet production channels and also background subtraction techniques to reduce the effect of the thermal background. Keeping track of these jet-medium recoils in JEWEL due to the background subtraction techniques significantly improves its descriptions of several jet structure and sub-structure measurements at the LHC.
Book Synopsis Transverse Momentum Spectra of B Jets in PPb Collisions at {u221A}(sNN) by :
Download or read book Transverse Momentum Spectra of B Jets in PPb Collisions at {u221A}(sNN) written by and published by . This book was released on 2016 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of b jet transverse momentum (pT) spectra in protonlead (pPb) collisions using a dataset corresponding to about 35 nb-1 collected with the CMS detector at the LHC. Jets from b quark fragmentation are found by exploiting the long lifetime of hadrons containing a b quark through tagging methods using distributions of the secondary vertex mass and displacement. Extracted cross sections for b jets are scaled by the effective number of nucleon-nucleon collisions and are compared to a reference obtained from PYTHIA simulations of pp collisions. Furthermore, the PYTHIA-based estimate of the nuclear modification factor is found to be 1.22±0.15 (stat+syst pPb)_0.27 (syst PYTHIA) averaged over all jets with pT between 55 and 400 GeV/c and with.
Book Synopsis Measurement of the Inclusive Jet Cross-section in P Anti-p Collisions at S**91 by :
Download or read book Measurement of the Inclusive Jet Cross-section in P Anti-p Collisions at S**91 written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Inclusive Jet Cross Section in Pp Collisions at Sqrt[s] by :
Download or read book Measurement of the Inclusive Jet Cross Section in Pp Collisions at Sqrt[s] written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The inclusive jet cross section is measured in pp collisions with a center-of-mass energy of 7 TeV at the LHC using the CMS experiment. The data sample corresponds to an integrated luminosity of 34 inverse picobarns. The measurement is made for jet transverse momenta in the range 18-1100 GeV and for absolute values of rapidity less than 3. The measured cross section extends to the highest values of jet pT ever observed and, within the experimental and theoretical uncertainties, is generally in agreement with next-to-leading-order perturbative QCD predictions.
Book Synopsis Measurement of Inclusive Jet Production and Nuclear Modifications in PPb Collisions at at √sNN by : CMS Collaboration
Download or read book Measurement of Inclusive Jet Production and Nuclear Modifications in PPb Collisions at at √sNN written by CMS Collaboration and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimating Cold Nuclear Matter Effects Using Jets in P-Pb Collisions At {591}sNN by : Christopher Ghanim Yaldo
Download or read book Estimating Cold Nuclear Matter Effects Using Jets in P-Pb Collisions At {591}sNN written by Christopher Ghanim Yaldo and published by . This book was released on 2015 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: In heavy-ion collisions at RHIC and the LHC, a suppression of the nuclear modification factor for jets along with other strongly interacting particles has been observed relative to proton-proton collisions. To unambiguously determine if this suppression is due to the creation of a strongly interacting medium of de-confied partons referred to as the Quark-Gluon Plasma, or due to Cold Nuclear Matter effects, a "control experiment" is required. Proton-lead collisions serve as this control experiment, because these colli- sions are expected to be sensitive to cold nuclear matter effects while not producing a QGP at this collision energy ({591}sNN = 5.02 TeV). Presented in this defense are the first measurements of charged + neutral jets in p-Pb collisions using the ALICE detector at the LHC. Measurements of CNM effects are done via the nuclear modification factor for jets: RpPb, RCP, and the jet structure ratio. Measurements of the jet spectrum along with a detailed and proper discussion of the statistical, systematic, and normalization uncertain- ties will be presented. Also a comparison of RpPb and RCP measured in this analysis to other measured RpPb and RCP from ATLAS and CMS will be presented. All the measurements performed in this analysis indicate that no strong cold nuclear matter effects are observed in p-Pb collisions using the ALICE detector at the LHC.
Book Synopsis Measurement of the Inclusive Jet Cross Section in Proton-proton Collisions at the √s by : Sebastian Eckweiler
Download or read book Measurement of the Inclusive Jet Cross Section in Proton-proton Collisions at the √s written by Sebastian Eckweiler and published by . This book was released on 2011 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characteristics of Charm Particles Produced by 800 GeV P-p Collisions by : Ai Gia Nguyen
Download or read book Characteristics of Charm Particles Produced by 800 GeV P-p Collisions written by Ai Gia Nguyen and published by . This book was released on 1988 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Charm Cross-section and Atomic Number Dependence in [pi]-N Collisions by :
Download or read book The Charm Cross-section and Atomic Number Dependence in [pi]-N Collisions written by and published by . This book was released on 1991 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a measurement of the total charm quark cross section in [pi]-N collisions. Recently. new predictions for the value of this cross section have been made using perturbative Quantum Chromodynamics (QCD). Before presenting these predictions, we briefly review the evidence for the existence of the charm quark and the colour charge of QCD. Also. the current experimental status of charm hadroproduction is described.
Book Synopsis Measurement of the Inclusive Jet Cross Section in Pp Collisions at √s by : CMS Collaboration
Download or read book Measurement of the Inclusive Jet Cross Section in Pp Collisions at √s written by CMS Collaboration and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of K0S and K*0 in P+p, D+Au, and Cu+Cu Collisions at Sqrt SNN by :
Download or read book Measurement of K0S and K*0 in P+p, D+Au, and Cu+Cu Collisions at Sqrt SNN written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The PHENIX experiment at the Relativistic Heavy Ion Collider has performed a systematic study of K0S and K*0 meson production at midrapidity in p+p, d+Au, and Cu+Cu collisions at sqrt SNN = 200 GeV. The K0S and K*0 mesons are reconstructed via their K0S and [pi]0(2!gamma][gamma])[pi]0 (2!gamma][gamma]) and K*0 2!K "[pi]" decay modes, respectively. The measured transverse-momentum spectra are used to determine the nuclear modification factor of K0S and K*0 mesons in d+Au and Cu+Cu collisions at different centralities. In the d+Au collisions, the nuclear modification factor of K0S and K*0 mesons is almost constant as a function of transverse momentum and is consistent with unity showing that cold-nuclear-matter effects do not play a significant role in the measured kinematic range. In Cu+Cu collisions, within the uncertainties no nuclear modification is registered in peripheral collisions. In central collisions, both mesons show suppression relative to the expectations from the p+p yield scaled by the number of binary nucleon-nucleon collisions in the Cu+Cu system. In the pT range 2-5 GeV/c, the strange mesons (K0S, K*0) similarly to the.
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