scholarly journals Ratio of strange to u/d momentum fraction in disconnected insertions

2020 ◽  
Vol 102 (3) ◽  
Author(s):  
Jian Liang ◽  
Mingyang Sun ◽  
Yi-Bo Yang ◽  
Terrence Draper ◽  
Keh-Fei Liu ◽  
...  
Keyword(s):  
Momentum Fraction

Dilepton production by protons on nuclei and the partonic origin of depletion at small momentum fraction

1991 ◽  
Vol 44 (3) ◽  
pp. 1188-1194 ◽  
Author(s):  
K. E. Lassila ◽  
U. P. Sukhatme ◽  
A. Harindranath ◽  
J. P. Vary
Keyword(s):  
Momentum Fraction ◽  
Dilepton Production ◽  
Small Momentum

scholarly journals Next-to-leading-logarithm threshold resummation for exclusive B meson decays

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
Zhi-Qing Zhang ◽  
Hsiang-nan Li
Keyword(s):  
Perturbative Qcd ◽  
B Meson ◽  
Theoretical Uncertainty ◽  
Momentum Fraction ◽  
B Meson Decays ◽  
Meson Decays ◽  
Threshold Resummation ◽  
End Point ◽  
Mellin Transformation ◽  
Leading Logarithm

AbstractWe extend the threshold resummation of the large logarithms $$\ln x$$ ln x which appear in factorization formulas for exclusive B meson decays, x being a spectator momentum fraction, to the next-to-leading-logarithm (NLL) accuracy. It is shown that the NLL resummation effect provides suppression in the end-point region with $$x\sim 0$$ x ∼ 0 stronger than the leading-logarithm (LL) one, and thus improves perturbative analyses of the above processes. We revisit the $$B\rightarrow K\pi $$ B → K π decays under the NLL resummation in the perturbative QCD approach, and find that it induces up to 20% variation of the direct CP asymmetries in various modes relative to the LL results. Our method to avoid the Landau singularity in the inverse Mellin transformation causes at most 10% theoretical uncertainty.

scholarly journals Taming the Energy Rise of the Total Proton-Proton Cross-Section

Universe ◽  
2019 ◽  
Vol 5 (5) ◽  
pp. 106 ◽  
Author(s):  
Sergey Ostapchenko ◽  
Marcus Bleicher
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Strong Increase ◽  
Momentum Fraction ◽  
Proton Proton ◽  
High Energies ◽  
Model Predictions ◽  
Potential Impact ◽  
Very High

Steep rise of parton densities in the limit of small parton momentum fraction x poses a challenge for describing the observed energy-dependence of the total and inelastic proton-proton cross sections σ p p tot / inel : considering a realistic parton spatial distribution, one obtains a too-strong increase of σ p p tot / inel in the limit of very high energies. We discuss various mechanisms which allow one to tame such a rise, paying special attention to the role of parton-parton correlations. In addition, we investigate a potential impact on model predictions for σ p p tot, related to dynamical higher twist corrections to parton-production processes.

scholarly journals Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass

2020 ◽  
Vol 101 (9) ◽  
Author(s):  
C. Alexandrou ◽  
S. Bacchio ◽  
M. Constantinou ◽  
J. Finkenrath ◽  
K. Hadjiyiannakou ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Pion Mass ◽  
Momentum Fraction ◽  
Physical Pion

scholarly journals Nonperturbatively renormalized glue momentum fraction at the physical pion mass from lattice QCD

2018 ◽  
Vol 98 (7) ◽  
Author(s):  
Yi-Bo Yang ◽  
Ming Gong ◽  
Jian Liang ◽  
Huey-Wen Lin ◽  
Keh-Fei Liu ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Pion Mass ◽  
Momentum Fraction ◽  
Physical Pion

scholarly journals Overview of jet physics results from ALICE

2020 ◽  
Vol 235 ◽  
pp. 01002
Author(s):  
Filip Krizek
Keyword(s):  
Transverse Momentum ◽  
Heavy Ion ◽  
Jet Quenching ◽  
Jet Physics ◽  
Jet Substructure ◽  
Momentum Fraction ◽  
Complementary Information ◽  
Ion Collisions ◽  
Resolution Parameter ◽  
Jet Fragmentation

Recent results from jet shower-shape and substructure analyses done by the ALICE collaboration in central Pb–Pb collisions at √sNN = 2.76 TeV and in pp collisions at √s = 7 TeV are reviewed. The presented jet shower- shape observables are angularity g and transverse momentum dispersion pTD, which were studied for a small resolution parameter R = 0.2, track-based jets with a minimum constituent transverse momentum (pT) cut-off of 0.15 GeV/c. Jet substructure is explored for track-based anti-kT jets with R = 0.4 by means of iterative declustering and grooming techniques, which were used to measure the absolutely-normalized leading subjet momentum fraction zg and the number of hard splittings in the reclustered jet shower, nSD. These observables provide complementary information on the jet fragmentation and help to discriminate between different scenarios for medium-induced modifications of the parton shower in heavy-ion collisions due to jet quenching.

scholarly journals Gluon momentum fraction of the nucleon from lattice QCD

2017 ◽  
Vol 96 (5) ◽  
Author(s):  
Constantia Alexandrou ◽  
Martha Constantinou ◽  
Kyriakos Hadjiyiannakou ◽  
Karl Jansen ◽  
Haralambos Panagopoulos ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Momentum Fraction ◽  
Gluon Momentum

ANALOG OF THE “EMC EFFECT” IN NEUTRINO-NUCLEUS INTERACTIONS

1991 ◽  
Vol 06 (04) ◽  
pp. 613-623 ◽  
Author(s):  
K.E. LASSILA ◽  
U.P. SUKHATME
Keyword(s):  
Momentum Fraction ◽  
Emc Effect

We have recently demonstrated that the main features of the EMC effect at all x follow straightforwardly if multiquark clusters exist in nuclei with physically reasonable probabilities. Here, we examine neutrino and antineutrino reactions as possible ways to explore multiquark clusters and other sources of the EMC effect. We find that the neutrino and antineutrino probes are able to emphasize different momentum fraction regions and allow discriminating experiments to be done.

scholarly journals A NEW SEARCH STRATEGY FOR THE HIGGS BOSON

2006 ◽  
Vol 21 (04) ◽  
pp. 934-937
Author(s):  
JACQUES SOFFER
Keyword(s):  
Higgs Boson ◽  
Light Cone ◽  
Search Strategy ◽  
Bound State ◽  
High Light ◽  
Higgs Production ◽  
Significant Fraction ◽  
Momentum Fraction ◽  
Intrinsic Charm ◽  
Theoretical Support

We propose a novel mechanism for exclusive diffractive Higgs production pp → Hpp, in which the Higgs carries a significant fraction of the projectile proton's momentum. This mechanism will then provide a clear experimental signal for Higgs production, due to the small background in this kinematic region. The key assumption underlying our analysis is the presence of intrinsic charm (IC) and intrinsic bottom (IB) fluctuations in the proton bound state, whose existence, at high light-cone momentum fraction x, has a substantial and growing experimental and theoretical support.

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