scholarly journals Interjet Energy Flow/Event Shape Correlations

2003 ◽  
Vol 18 (23) ◽  
pp. 4159-4168 ◽  
Author(s):  
Carola F. Berger ◽  
Tibor Kúcs ◽  
George Sterman
Keyword(s):  
Energy Flow ◽  
High Energy ◽  
Laplace Transforms ◽  
Intermediate Energy ◽  
Event Shape ◽  
Color Flow ◽  
Angular Region ◽  
Event Shapes

We identify a class of perturbatively computable measures of interjet energy flow, which can be associated with well-defined color flow at short distances. As an illustration, we calculate correlations between event shapes and the flow of energy, QΩ, into an interjet angular region, Ω, in high-energy two-jet e+e--annihilation events. Laplace transforms with respect to the event shapes suppress states with radiation at intermediate energy scales, so that we may compute systematically logarithms of interjet energy flow. This method provides a set of predictions on energy radiated between jets, as a function of event shape and of the choice of the region Ω in which the energy is measured. Non-global logarithms appear as corrections. We apply our method to a continuous class of event shapes.

scholarly journals Soft-drop grooming for hadronic event shapes

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Jeremy Baron ◽  
Daniel Reichelt ◽  
Steffen Schumann ◽  
Niklas Schwanemann ◽  
Vincent Theeuwes
Keyword(s):  
Event Generator ◽  
Experimental Measurements ◽  
Event Shape ◽  
Matrix Elements ◽  
Underlying Event ◽  
Hadronic Event ◽  
Wide Range ◽  
Event Shapes ◽  
The Impact ◽  
Perturbative Corrections

Abstract Soft-drop grooming of hadron-collision final states has the potential to significantly reduce the impact of non-perturbative corrections, and in particular the underlying-event contribution. This eventually will enable a more direct comparison of accurate perturbative predictions with experimental measurements. In this study we consider soft-drop groomed dijet event shapes. We derive general results needed to perform the resummation of suitable event-shape variables to next-to-leading logarithmic (NLL) accuracy matched to exact next-to-leading order (NLO) QCD matrix elements. We compile predictions for the transverse-thrust shape accurate to NLO + NLL′ using the implementation of the Caesar formalism in the Sherpa event generator framework. We complement this by state-of-the-art parton- and hadron-level predictions based on NLO QCD matrix elements matched with parton showers. We explore the potential to mitigate non-perturbative corrections for particle-level and track-based measurements of transverse thrust by considering a wide range of soft-drop parameters. We find that soft-drop grooming indeed is very efficient in removing the underlying event. This motivates future experimental measurements to be compared to precise QCD predictions and employed to constrain non-perturbative models in Monte-Carlo simulations.

scholarly journals From correlation functions to event shapes in QCD

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
D. Chicherin ◽  
J. M. Henn ◽  
E. Sokatchev ◽  
K. Yan
Keyword(s):  
Correlation Function ◽  
Correlation Functions ◽  
Event Shape ◽  
Proof Of Concept ◽  
Yang Mills ◽  
Point Correlation ◽  
Point Correlation Function ◽  
Event Shapes ◽  
A Charge ◽  
Conserved Currents

Abstract We present a method for calculating event shapes in QCD based on correlation functions of conserved currents. The method has been previously applied to the maximally supersymmetric Yang-Mills theory, but we demonstrate that supersymmetry is not essential. As a proof of concept, we consider the simplest example of a charge-charge correlation at one loop (leading order). We compute the correlation function of four electromagnetic currents and explain in detail the steps needed to extract the event shape from it. The result is compared to the standard amplitude calculation. The explicit four-point correlation function may also be of interest for the CFT community.

scholarly journals The Multifarious Functions of Pyruvate Kinase M2 in Oral Cancer Cells

2018 ◽  
Vol 19 (10) ◽  
pp. 2907 ◽  
Author(s):  
Miyako Kurihara-Shimomura ◽  
Tomonori Sasahira ◽  
Chie Nakashima ◽  
Hiroki Kuniyasu ◽  
Hiroyuki Shimomura ◽  
...  
Keyword(s):  
Cancer Cells ◽  
Pyruvate Kinase ◽  
Energy Flow ◽  
Aerobic Glycolysis ◽  
High Energy ◽  
Strongly Correlated ◽  
Mucosal Cells ◽  
Oral Cancer Cells ◽  
And Function

Head and neck cancers, including oral squamous cell carcinoma (OSCC), are the sixth most common malignancies worldwide. OSCC frequently leads to oral dysfunction, which worsens a patient’s quality of life. Moreover, its prognosis remains poor. Unlike normal cells, tumor cells preferentially metabolize glucose by aerobic glycolysis. Pyruvate kinase (PK) catalyzes the final step in glycolysis, and the transition from PKM1 to PKM2 is observed in many cancer cells. However, little is known about PKM expression and function in OSCC. In this study, we investigated the expression of PKM in OSCC specimens and performed a functional analysis of human OSCC cells. We found that the PKM2/PKM1 ratio was higher in OSCC cells than in adjacent normal mucosal cells and in samples obtained from dysplasia patients. Furthermore, PKM2 expression was strongly correlated with OSCC tumor progression on immunohistochemistry. PKM2 expression was higher during cell growth, invasion, and apoptosis in HSC3 cells, which show a high energy flow and whose metabolism depends on aerobic glycolysis and oxidative phosphorylation. PKM2 expression was also associated with the production of reactive oxygen species (ROS) and integration of glutamine into lactate. Our results suggested that PKM2 has a variety of tumor progressive functions in OSCC cells.

The electronic structure and spin-charge separation of one-dimensional SrCuO2

2019 ◽  
Vol 33 (02) ◽  
pp. 1950006
Author(s):  
Huaisong Zhao ◽  
Jiasheng Qian ◽  
Sheng Xu ◽  
Feng Yuan
Keyword(s):  
Electronic Structure ◽  
Charge Separation ◽  
Energy Region ◽  
Doping Concentration ◽  
High Energy ◽  
Intermediate Energy ◽  
Low Energy ◽  
One Dimensional ◽  
High Energy Peak ◽  
Energy Peak

Based on the t-J model and slave-boson theory, we have studied the electronic structure in one-dimensional SrCuO2 by calculating the electron spectrum. Our results show that the electron spectra are mainly composed of three parts in one-dimensional SrCuO2, a sharp low-energy peak, a broad intermediate-energy peak and a high-energy peak. The sharp low-energy peak corresponds to the main band (MB) while the broad intermediate-energy peak and high-energy peak are associated with the shadow band (SB) and high-energy band (HB), respectively. From low-energy to intermediate-energy region, a clear two-peak structure (MB and SB) around the momentum [Formula: see text] appears, and the distance between two peaks decreases along the momentum direction from [Formula: see text] to [Formula: see text], then disappears at the critical momentum point [Formula: see text], leaving a single peak above [Formula: see text]. The electron spectral function in one-dimensional SrCuO2 is also the doping and temperature dependent. In particular, in the very low doping concentration, the HB merges into the MB. However, with the increases of the doping concentration, the HB separates from the MB and moves quickly to the high-binding energy region. The HB and MB are the direct results of the spin-charge separation while SB is the result of strong interaction between charge and spin parts. Therefore, our theoretical result predicts that the HB is more likely to be found at the low doping concentration, and it will be drowned in the background when the doping concentration is larger. Then with the temperature increases, the magnitude of the SB decreases, and it disappears at high temperature.

Cerebral high-energy compounds: changes in anoxia

1962 ◽  
Vol 202 (1) ◽  
pp. 77-79 ◽  
Author(s):  
Richard N. Lolley ◽  
Frederick E. Samson
Keyword(s):  
Ion Exchange ◽  
Rat Brain ◽  
Adenosine Triphosphate ◽  
Energy Flow ◽  
Inorganic Phosphate ◽  
High Energy ◽  
High Energy Phosphate ◽  
Guanosine Triphosphate ◽  
Inosine Monophosphate ◽  
Flow Through

Acid-soluble phosphates of rat brain during anoxia were determined by ion-exchange and chemical procedures. There is a general shift during anoxia of triphosphate nucleotides to monophosphates and a very rapid breakdown of phosphoryl-creatine. However, total phosphate leaving the high-energy phosphate pool is not equal to the changes in inorganic phosphate; inorganic phosphate change is much larger than high-energy phosphate change in early anoxia and much smaller in extended anoxia. The patterns of guanosine triphosphate and uridine triphosphate changes are more complex than adenosine triphosphate changes. Nicotinamideadenine dinucleotide levels are steady until late anoxia, at which time they decrease slightly. Cytidine monophosphate is the only cytidine nucleotide detected. Inosine nucleotide concentrations in control animals were below the limit of the method, but in late anoxia inosine monophosphate appeared. The data show that the energy flow through the phosphates in brain is rapid and involves phosphate compounds other than the acid-soluble nucleotides and phosphoryl-creatine.

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