PHASE-SPACE CONSIDERATIONS IN THE TRANSVERSE MOMENTUM ANALYSIS

1987 ◽  
Vol 48 (C2) ◽  
pp. C2-233-C2-239
Author(s):  
P. DANIELEWICZ
Keyword(s):  
Phase Space ◽  
Transverse Momentum

scholarly journals Monte Carlo phase space with limited transverse momentum

1978 ◽  
Vol 28 (3) ◽  
pp. 327-356 ◽  
Author(s):  
David C. Carey ◽  
Daniel Druard
Keyword(s):  
Monte Carlo ◽  
Phase Space ◽  
Transverse Momentum

scholarly journals Measurements of $${\Xi \left( 1530\right) ^{0}} $$ and $${\overline{\Xi }\left( 1530\right) ^{0}} $$ production in proton–proton interactions at $$\sqrt{s_{NN}}$$ = 17.3 $$\text{ GeV }$$ in the NA61/SHINE experiment

2021 ◽  
Vol 81 (10) ◽  
Author(s):  
A. Acharya ◽  
H. Adhikary ◽  
K. K. Allison ◽  
N. Amin ◽  
E. V. Andronov ◽  
...  
Keyword(s):  
Phase Space ◽  
Transverse Momentum ◽  
Statistical Model ◽  
Beam Momentum ◽  
Proton Proton ◽  
Model Calculations ◽  
Full Phase Space ◽  
Momentum Spectra ◽  
Transverse Momentum Spectra

AbstractDouble-differential yields of $${\Xi \left( 1530\right) ^{0}} $$ Ξ 1530 0 and $${\overline{\Xi }\left( 1530\right) ^{0}} $$ Ξ ¯ 1530 0 resonances produced in p+p interactions were measured at a laboratory beam momentum of 158 $$\text{ GeV }\!/\!c$$ GeV / c . This measurement is the first of its kind in p+p interactions below LHC energies. It was performed at the CERN SPS by the NA61/SHINE collaboration. Double-differential distributions in rapidity and transverse momentum were obtained from a sample of $$26\times 10^6$$ 26 × 10 6 inelastic events. The spectra are extrapolated to full phase space resulting in mean multiplicity of $${\Xi \left( 1530\right) ^{0}} $$ Ξ 1530 0 ($$6.73 \pm 0.25\pm 0.67)\times 10^{-4}$$ 6.73 ± 0.25 ± 0.67 ) × 10 - 4 and $${\overline{\Xi }\left( 1530\right) ^{0}} $$ Ξ ¯ 1530 0 ($$2.71 \pm 0.18\pm 0.18)\times 10^{-4}$$ 2.71 ± 0.18 ± 0.18 ) × 10 - 4 . The rapidity and transverse momentum spectra and mean multiplicities were compared to predictions of string-hadronic and statistical model calculations.

scholarly journals The energy dependence of antiparticle to particle ratios in high energy pp collisions

2014 ◽  
Vol 23 (12) ◽  
pp. 1450088
Author(s):  
Wang Jiang-Ling ◽  
Li Di-Kai ◽  
Li Hai-Jun ◽  
Chen Gang
Keyword(s):  
Phase Space ◽  
Transverse Momentum ◽  
Energy Dependence ◽  
Preliminary Data ◽  
High Energy ◽  
Pp Collisions ◽  
Average Transverse Momentum ◽  
Significant Dependence ◽  
Particle Ratios ◽  
200 Gev

The energy dependence of the ratio for antiparticle to particle in pp collisions of high energy is studied using the parton and hadron cascade and dynamically constrained phase-space coalescence models. The yield ratios of antimatter and matter for different masses are measured at various c.m energies. It is found that the yield ratios of antimatter and matter increase with the increase of the c.m energy of pp collisions until they gradually approach to 1 after the c.m energy is more than 200 GeV. The distribution of transverse momentum also has significant dependence on the energy and mass, i.e., the average transverse momentum increases when the c.m energy of pp collisions increase. The model results are compatible with the STAR and ALICE preliminary data.

scholarly journals Integrable, oblique travelling waves in quasi-charge-neutral two-fluid plasmas

2008 ◽  
Vol 15 (1) ◽  
pp. 179-208 ◽  
Author(s):  
G. M. Webb ◽  
C. M. Ko ◽  
R. L. Mace ◽  
J. F. McKenzie ◽  
G. P. Zank
Keyword(s):  
Phase Space ◽  
Transverse Momentum ◽  
Electric Fields ◽  
Travelling Waves ◽  
Fluid Velocity ◽  
Structure Equation ◽  
Longitudinal Structure ◽  
Hamiltonian Description ◽  
Two Fluids ◽  
Two Fluid

Abstract. A Hamiltonian description of oblique travelling waves in a two-fluid, charge-neutral, electron-proton plasma reveals that the transverse momentum equations for the electron and proton fluids are exactly integrable in cases where the total transverse momentum flux integrals, Py(d) and Pz(d), are both zero in the de Hoffman Teller (dHT) frame. In this frame, the transverse electric fields are zero, which simplifies the transverse momentum equations for the two fluids. The integrable travelling waves for the case Py(d)=Pz(d)=0, are investigated based on the Hamiltonian trajectories in phase space, and also on the longitudinal structure equation for the common longitudinal fluid velocity component ux of the electron and proton fluids. Numerical examples of a variety of travelling waves in a cold plasma, including oscillitons, are used to illustrate the physics. The transverse, electron and proton velocity components ujy and ujz (j=e, p) of the waves exhibit complex, rosette type patterns over several periods for ux. The role of separatrices in the phase space, the rotational integral and the longitudinal structure equation on the different wave forms are discussed.

scholarly journals The anomalous production of multi-leptons and its impact on the measurement of Wh production at the LHC

2021 ◽  
Vol 81 (4) ◽  
Author(s):  
Yesenia Hernandez ◽  
Mukesh Kumar ◽  
Alan S. Cornell ◽  
Salah-Eddine Dahbi ◽  
Yaquan Fang ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Phase Space ◽  
Transverse Momentum ◽  
Large Hadron Collider ◽  
Hadron Collider ◽  
Signal Strength ◽  
Model Parameters ◽  
Final States ◽  
Link Type ◽  
Heavy Boson

AbstractAnomalies in multi-lepton final states at the Large Hadron Collider (LHC) have been reported in Refs. (von Buddenbrock et al., J Phys G 45(11):115003, arXiv:1711.07874 [hep-ph], 2018; Buddenbrock et al., JHEP 1910:157, arXiv:1901.05300 [hep-ph], 2019). These can be interpreted in terms of the production of a heavy boson, H, decaying into a standard model (SM) Higgs boson, h, and a singlet scalar, S, which is treated as a SM Higgs-like boson. This process would naturally affect the measurement of the Wh signal strength at the LHC, where h is produced in association with leptons and di-jets. Here, h would be produced with lower transverse momentum, $$p_{Th}$$ p Th , compared to SM processes. Corners of the phase-space are fixed according to the model parameters derived in Refs. (von Buddenbrock et al., J Phys G 45(11):115003, arXiv:1711.07874 [hep-ph], 2018; von Buddenbrock et al., Eur Phys J C 76(10):580, arXiv:1606.01674 [hep-ph], 2016) without additional tuning, thus nullifying potential look-else-where effects or selection biases. Provided that no stringent requirements are made on $$p_{Th}$$ p Th or related observables, the signal strength of Wh is $$\mu (Wh)=2.41 \pm 0.37$$ μ ( W h ) = 2.41 ± 0.37 . This corresponds to a deviation from the SM of $$3.8\sigma $$ 3.8 σ . This result further strengthens the need to measure with precision the SM Higgs boson couplings in $$e^+e^-$$ e + e - , and $$e^-p$$ e - p collisions, in addition to pp collisions.

scholarly journals Measurements of triple-differential cross sections for inclusive isolated-photon+jet events in $$\mathrm{p}\mathrm{p}$$ collisions at $$\sqrt{s} = 8\,\text {TeV} $$

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
A. M. Sirunyan ◽  
◽  
A. Tumasyan ◽  
W. Adam ◽  
F. Ambrogi ◽  
...  
Keyword(s):  
Phase Space ◽  
Transverse Momentum ◽  
Differential Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Differential Cross ◽  
Leading Order ◽  
Perturbative Quantum Chromodynamics ◽  
Triple Differential Cross Section ◽  
Perturbative Quantum

AbstractMeasurements are presented of the triple-differential cross section for inclusive isolated-photon+jet events in $$\mathrm{p}\mathrm{p}$$pp collisions at $$\sqrt{s} = 8$$s=8 TeV as a function of photon transverse momentum ($$p_{\mathrm {T}} ^{{\upgamma {}{}}}$$pTγ), photon pseudorapidity ($$\eta ^{{\upgamma {}{}}}$$ηγ), and jet pseudorapidity ($$\eta ^{\text {jet}}$$ηjet). The data correspond to an integrated luminosity of $$19.7{\,\text {fb}^{-1}} $$19.7fb-1 that probe a broad range of the available phase space, for $$|\eta ^{{\upgamma {}{}}} |<1.44$$|ηγ|<1.44 and $$1.57<|\eta ^{{\upgamma {}{}}} |<2.50$$1.57<|ηγ|<2.50, $$|\eta ^{\text {jet}} |<2.5$$|ηjet|<2.5, $$40< p_{\mathrm {T}} ^{{\upgamma {}{}}}<1000$$40<pTγ<1000$$\,\text {GeV}$$GeV, and jet transverse momentum, $$p_{\mathrm {T}} ^{\text {jet}}$$pTjet, > 25$$\,\text {GeV}$$GeV. The measurements are compared to next-to-leading order perturbative quantum chromodynamics calculations, which reproduce the data within uncertainties.

scholarly journals Anisotropic Flow in the Few Collisions Regime: Application to Bottomonia

Proceedings ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 16
Author(s):  
Nina Kersting ◽  
Nicolas Borghini ◽  
Steffen Feld
Keyword(s):  
Boltzmann Equation ◽  
Phase Space ◽  
Transverse Momentum ◽  
Knudsen Number ◽  
Space Distribution ◽  
Momentum Dependence ◽  
Anisotropic Flow ◽  
Phase Space Distribution ◽  
Kinetic Boltzmann Equation ◽  
Inverse Knudsen Number

Considering the kinetic Boltzmann equation in the limit of very few collisions, we study the evolution of the phase space distribution of bottomonia interacting with an expanding gas of massless partons. We investigate the scaling of the anisotropic flow coefficients on the initial eccentricities and the inverse Knudsen number, and compute their transverse momentum dependence.

scholarly journals The study of exotic state $$Z_c^{\pm }(3900)$$ decaying to $$J/\psi \pi ^{\pm }$$ in the pp collisions at $$\sqrt{s}$$ = 1.96, 7, and 13 TeV

2021 ◽  
Vol 81 (3) ◽  
Author(s):  
Zhen Zhang ◽  
Liang Zheng ◽  
Gang Chen ◽  
Hong-Ge Xu ◽  
Dai-Mei Zhou ◽  
...  
Keyword(s):  
Phase Space ◽  
Transverse Momentum ◽  
Energy Dependence ◽  
Resonant State ◽  
Decay Chain ◽  
Bound State ◽  
Exotic State ◽  
Coalescence Model ◽  
Momentum Distributions ◽  
Rapidity Distributions

AbstractA dynamically constrained phase-space coalescence model and PACIAE model are used to predict the exotic resonant state $$Z_c^{\pm }(3900)$$ Z c ± ( 3900 ) yield in pp collisions at $$\sqrt{s} = 1.96, 7$$ s = 1.96 , 7 and 13 TeV, respectively, which are estimated to be around $$10^{-6}$$ 10 - 6 to $$10^{-5}$$ 10 - 5 based on the $$J/\psi \pi ^{\pm }$$ J / ψ π ± bound state in the decay chain of b hadrons. The energy dependence of the transverse momentum distributions and rapidity distributions with $$|y|<6$$ | y | < 6 and $$p_{T}<10$$ p T < 10 GeV/c are also calculated for $${Z_c^{+}(3900)}$$ Z c + ( 3900 ) and $${Z_c^{-}(3900)}$$ Z c - ( 3900 ) . The production of $${Z_c^{+}(3900)}$$ Z c + ( 3900 ) and its anti-particle $${Z_c^{-}(3900)}$$ Z c - ( 3900 ) are found to be quite similar to each other.

A one-dimensional self-gravitating stellar gas

1966 ◽  
Vol 25 ◽  
pp. 46-48 ◽  
Author(s):  
M. Lecar
Keyword(s):  
Gravitational Field ◽  
Phase Space ◽  
Motion Picture ◽  
Space Distribution ◽  
Two Dimensional ◽  
One Dimensional ◽  
Phase Space Distribution ◽  
Dimensional Phase Space ◽  
The Mean

“Dynamical mixing”, i.e. relaxation of a stellar phase space distribution through interaction with the mean gravitational field, is numerically investigated for a one-dimensional self-gravitating stellar gas. Qualitative results are presented in the form of a motion picture of the flow of phase points (representing homogeneous slabs of stars) in two-dimensional phase space.

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