scholarly journals Hadronic Cross Section Measurements at Belle and perspectives for BELLE-II

2019 ◽  
Vol 218 ◽  
pp. 02011
Author(s):  
B. Shwartz
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Large Data ◽  
Hadronic Cross Section ◽  
Belle Detector ◽  
Belle Ii ◽  
Integrated Luminosity

Large data amount, about 1 ab−1 of integrated luminosity, collected in experiments with the Belle detector provided a good possibilities for precise measurements of the hadronic cross sections in e+e− annihilation. Main results obtained in this field with the Belle detector as well as perspectives of the new experiments with the Belle II detector at the SuperKEKB collider is discussed in this report.

scholarly journals Open charm studies at Belle

2019 ◽  
Vol 212 ◽  
pp. 09003
Author(s):  
Valentina Zhukova
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Open Charm ◽  
Mass Energy ◽  
Initial State ◽  
Belle Detector ◽  
Section Measurement ◽  
Angular Analysis ◽  
State Radiation ◽  
Radiation Technique

We present the new results of measurements of the exlusive cross sections of the e+ e− annihilation to charmed meson pairs as a function of √ ceneter-of-mass energy from the open charm threashold up to $ \sqrt s = {\rm{6 GeV}} $ using initial state radiation technique. The analysis is based on a data sample collected by the Belle detector with an integrated luminosity of 951 fb−1. The accuracy of the cross section measurement is increased by a factor of 2 in comparison with the first Belle study. We have performed the first angular analysis + −→ D*± D*∓ of the $ {e^{\rm{ + }}}{e^ - } \to {D^{* \pm }}{D^{* \mp }} $ process and decomposed this exclusive cross section into three components corresponding to the different D* helicities.

scholarly journals The KLOE-2 experiment at DAΦNE

2019 ◽  
Vol 212 ◽  
pp. 01002
Author(s):  
Paolo Gauzzi ◽  
Elena Perez del Rio
Keyword(s):  
Cross Section ◽  
Hadronic Cross Section ◽  
Detector Acceptance ◽  
Dark Force ◽  
Light Mesons ◽  
Integrated Luminosity

The KLOE-2 Collaboration succesfully ended its data-taking collecting a total integrated luminosity of 5.5 fb−1 at the peak of the φ(1020) resonance at the DAΦNE collider of the Frascati LNF. New detectors have been added to the KLOE apparatus to improve the detector acceptance, the tracking capability, and also to be able to tag the scattered electrons in γγ processes. By summing the new data sample to the old one of the previous KLOE data-taking ended in 2006, a total of about 8 fb−1 has been collected, corresponding to 24 billions of φ produced. The measurement program of KLOE-2 includes precision studies on kaon and other light mesons, hadronic cross-section, and dark force searches.

scholarly journals Measurement of the cross-section and charge asymmetry of W bosons produced in proton–proton collisions at $$\sqrt{s}=8~\text {TeV}$$ with the ATLAS detector

2019 ◽  
Vol 79 (9) ◽  
Author(s):  
G. Aad ◽  
◽  
B. Abbott ◽  
D. C. Abbott ◽  
O. Abdinov ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Charge Asymmetry ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Proton Proton ◽  
Proton Collisions ◽  
The Cross ◽  
Proton Proton Collisions ◽  
Integrated Luminosity

Abstract This paper presents measurements of the $$W^+ \rightarrow \mu ^+\nu $$W+→μ+ν and $$W^- \rightarrow \mu ^-\nu $$W-→μ-ν cross-sections and the associated charge asymmetry as a function of the absolute pseudorapidity of the decay muon. The data were collected in proton–proton collisions at a centre-of-mass energy of 8 $$\text {TeV}$$TeV with the ATLAS experiment at the LHC and correspond to a total integrated luminosity of $$20.2~\text{ fb }^{-1}$$20.2fb-1. The precision of the cross-section measurements varies between 0.8 and 1.5% as a function of the pseudorapidity, excluding the 1.9% uncertainty on the integrated luminosity. The charge asymmetry is measured with an uncertainty between 0.002 and 0.003. The results are compared with predictions based on next-to-next-to-leading-order calculations with various parton distribution functions and have the sensitivity to discriminate between them.

scholarly journals The Belle II Experiment: Status and Physics Prospects

2018 ◽  
Vol 46 ◽  
pp. 1860082
Author(s):  
Jake Bennett
Keyword(s):  
Large Data ◽  
New Physics ◽  
Data Set ◽  
Meson Decays ◽  
Belle Detector ◽  
Large Data Set ◽  
Belle Ii ◽  
Lepton Decays ◽  
Under Construction

The Belle II experiment is now under construction at the KEK laboratory in Japan. This project represents a substantial upgrade to both the Belle detector and the KEKB accelerator. The Belle II experiment will record 50/ab of data, a factor of 50 more than that recorded by Belle. This large data set, combined with the low backgrounds and high trigger efficiencies characteristic of an [Formula: see text] experiment, should provide unprecedented sensitivity to new physics signatures in [Formula: see text] and [Formula: see text] meson decays, and in [Formula: see text] lepton decays. The experiment is scheduled to begin physics running in 2018.

scholarly journals JET CROSS-SECTION MEASUREMENTS IN CMS

2013 ◽  
Vol 28 (20) ◽  
pp. 1330030 ◽  
Author(s):  
SANMAY GANGULY ◽  
MONORANJAN GUCHAIT
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Mass Measurement ◽  
Hadron Collider ◽  
Center Of Mass ◽  
Order Theory ◽  
Distribution Functions ◽  
Dijet Mass ◽  
Inclusive Jet ◽  
Integrated Luminosity

The Large Hadron Collider experiment has successfully completed data taking at center-of-mass energy 7 TeV in 2011 and very recently for 8 TeV. Measurements of cross-sections predicted by the standard model were the main tasks in the beginning. The inclusive jet cross-section and dijet mass measurement are already done at 7 TeV energy by Compact Muon Solenoid (CMS) detector with integrated luminosity 5 fb-1. In these measurement, one needs to understand and measure precisely the kinematic properties of jets which involve many theoretical and experimental issues. The goal of this paper is to discuss all these issues including jet measurements in CMS and subsequently review the inclusive jet cross-section and dijet mass measurement in CMS at 7 TeV with integrated luminosity 5 fb-1. The measurements, after unfolding the data, are also compared with the next-to-leading-order theory predictions, corrected for the nonperturbative effects, for five different sets of parton distribution functions. It is observed that the measurements, for both cases, agree with the theory prediction within ~8–10% depending on transverse momentum (pT) and dijet invariant mass (Mjj) of jets.

scholarly journals Recent Hadronic Cross Section Measurements from BABAR

2019 ◽  
Vol 218 ◽  
pp. 02003
Author(s):  
Konrad Griessinger
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Hadronic Cross Section ◽  
Babar Experiment

New hadronic cross sections measured by the BABAR experiment are presented: e+e−→ π+π−π0π0, e+ e−→ π+π−η, and the kaonic channels e+e−→ KS KLπ0 , KS KLπ0π0 , KS KLη, KS K±π+π0 , KS K±π+η.

scholarly journals Twist-3 contributions to $$\gamma \gamma \rightarrow \pi ^+\pi ^-,K^+K^-$$ processes in perturbative QCD approach

2019 ◽  
Vol 79 (9) ◽  
Author(s):  
Cong Wang ◽  
Jun-Kang He ◽  
Ming-Zhen Zhou
Keyword(s):  
Perturbative Qcd ◽  
Cross Section ◽  
Cross Sections ◽  
Degrees Of Freedom ◽  
Intermediate Energy ◽  
Angular Distributions ◽  
Experimental Measurements ◽  
Belle Ii ◽  
The Cross ◽  
Near Future

Abstract As one of the simplest hadronic processes, $$\gamma \gamma \rightarrow M^{+}M^{-}$$γγ→M+M- ($$M=\pi ,K$$M=π,K) could be a good testing ground for our understanding of the perturbative and nonperturbative structure of QCD, and will be studied with high precision at BELLE-II in the near future. In this paper, we revisit these processes with twist-3 corrections in the perturbative QCD approach based on the $$k_{T}$$kT factorization theorem, in which transverse degrees of freedom as well as resummation effects are taken into account. The influence of the distribution amplitudes on the cross sections are discussed in detail. Our work shows that not only the transverse momentum effects but also the twist-3 corrections play a significant role in the processes $$\gamma \gamma \rightarrow M^{+}M^{-}$$γγ→M+M- in the intermediate energy region. Especially in the few GeV region, the twist-3 contributions become dominant in the cross sections. And it is noteworthy that both the twist-3 result of the $$\pi ^{+}\pi ^{-}$$π+π- cross section and that of the $$K^{+}K^{-}$$K+K- cross section agree well with the BELLE and ALEPH measurements. For the pion and kaon angular distributions, there still exist discrepancies between our results and the experimental measurements. Possible reasons for these discrepancies are discussed briefly.

scholarly journals Angular analysis of the e+e- → D(*)D* process near the open-charm threshold using initial-state radiation

2019 ◽  
Vol 202 ◽  
pp. 06008
Author(s):  
Valentina Zhukova
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Center Of Mass ◽  
Initial State Radiation ◽  
Initial State ◽  
Center Of Mass Energy ◽  
Belle Detector ◽  
Section Measurement ◽  
Angular Analysis ◽  
State Radiation

We report new measurement of the exclusive e+e- → D(*)±D*∓ cross sections as a function of center-of-mass energy from the D(∗)±D∗∓ threshold up to $ \sqrt s $ = 6.0 GeV with initial state radiation. The analysis is based on a data sample collected by the Belle detector with an integrated luminosity of 951 fb−1. The accuracy of the cross section measurement is increased by a factor of 2 in comparison with the first Belle study. We have performed the first angular analysis of the e+e- → D∗±D∗∓ process and decomposed this exclusive cross section into three components corresponding to the different D∗ helicities.

GAMMA GAMMA PHYSICS AT BELLE

2014 ◽  
Vol 35 ◽  
pp. 1460396 ◽  
Author(s):  
SADAHARU UEHARA ◽  
Keyword(s):  
Form Factor ◽  
Differential Cross Section ◽  
Cross Section ◽  
Cross Sections ◽  
Transition Form Factor ◽  
Light Quark ◽  
Transition Form ◽  
Two Photon ◽  
Belle Detector ◽  
Meson Pair

We report a high-statistics measurement of the differential cross section of the process [Formula: see text] with the Belle detector. We study spectroscopy of light-quark resonances and charmonia and test QCD models using the data. We summarize our systematic measurements of different processes of γγ → meson-pair production based on the parameterization of the cross sections and comparison with QCD models. We also report on the measurement of the two-photon π0 transition form factor at Belle.

The effect of Higgs boson radiation from TeV black holes on the hadronic cross section at the LHC

2012 ◽  
Vol 90 (1) ◽  
pp. 25-37 ◽  
Author(s):  
A. Sepehri ◽  
M.E. Zomorrodian ◽  
A. Moradi Marjaneh ◽  
P. Eslami ◽  
S. Shoorvazi
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Higgs Boson ◽  
Cross Section ◽  
Cross Sections ◽  
Unruh Effect ◽  
Leading Order ◽  
Hadronic Cross Section ◽  
The Cross ◽  
Mini Black Holes

In curved space–time near TeV black holes many gluons and quarks produced by the Unruh effect interact with each other and create Higgs bosons. We study the Unruh effect and show that, for gluons and quarks, the internal stationary state of a Schwarzschild black hole can be represented by a maximally entangled two-mode squeezed state of outgoing and infalling Hawking radiation. We consider different channels for Higgs boson production near event horizons of mini black holes at the Large Hadron Collider (LHC) and obtain the cross section in each channel. We observe that the cross section of a Higgs boson produced via gluon fusion near a single black hole is much larger for smaller black hole masses. This is because the temperature of the black hole becomes larger as the mass becomes smaller and the thermal radiation of the gluons is enhanced. At lower mass, MBH < 4 TeV, the black hole will not be able to emit Higgs, but will still be able to produce a quark; for MBH < 3 TeV the black hole can only emit massless gluons. We show that as the black hole mass at the LHC increases (4 TeV < MBH < 8 TeV) most of the Higgs boson production is due to the Unruh effect near the event horizon of the black hole. Comparing these Higgs boson cross sections with Higgs boson cross sections in perturbative quantum chromodynamics, we find that micro black holes can be a source of Higgs production at the LHC. Finally, we calculate the effects of Higgs boson radiation due to mini black holes on the hadronic cross section at the LHC. We observe that as the order of perturbation theory increases this effect becomes systematically more significant because at higher orders there exist more channels for Higgs production and, in our calculations, Higgs decay into massive quark–antiquark pairs. At smaller masses, MBH < 2 TeV, the hadronic cross section at leading order is large while the cross sections at next-to-leading order and at next-to-next-to-leading order are rising at MBH ∼ 2 and 3 TeV, respectively, and exhibit a turn-over at moderate values of black hole mass.

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