共查询到20条相似文献,搜索用时 15 毫秒
1.
J. Lindfors 《Zeitschrift fur Physik C Particles and Fields》1985,29(2):249-253
We analyse the lowest-order QCD production mechanisms forp \(\bar p\) →W ±+jet andp \(\bar p\) →Z 0+jet to find possible differences in jet properties for the two processes. 相似文献
2.
We examine the prospects for observing weak flavour-changing neutral current (FCNC) decays ofB mesons at hadron colliders, including effects of anomalousWWZ vertices. Since it is very difficult to measure the inclusive rate B Xs +– one should consider exclusive modes such as BK* + – and B K+ –. Even though this requires one to compute hadronic matrix elements, we show that experimentally observable quantities (ratios of decay rates) are not strongly parametrisation dependent. Some possibilities for reducing the theoretical uncertainties from other experimental data are discussed. 相似文献
3.
E. W. N. Glover A. D. Martin W. J. Stirling 《Zeitschrift fur Physik C Particles and Fields》1988,38(3):473-478
We calculateJ/ψ hadroproduction and emphasize the importance of theJ/ψ signal as a measure ofb \(\bar b\) production via the decayB→ψX and of the gluon structure function at lowx via χ hadroproduction followed by χ→ψγ decay. We compare with UA1 data and data at ISR energies and make predictions for ψ production at TEVATRON energies. 相似文献
4.
Investigations of rare charmed-meson decays are used to test the Standard Model and to perform searches for new physics beyond it. Advances made in searches for the rare decay D 0 → µ+µ? in experiments at the HERA and Tevatron hadron colliders and at the LHC over the last few years are considered. 相似文献
5.
Potential possibilities to detect the effects of Z–Z' mixing in the W-pair production process in proton-proton and electron–positron collisions at the Large Hadron Collider (LHC) and International Linear Collider (ILC) have been studied. It has been established that the processes of W boson pair production are very sensitive to the angle of Z–Z' mixing and their measurements in current and future experiments will make it possible to improve modern restrictions on the angle of Z–Z' mixing in the models with extended gauge sector. At a nominal energy of 14 TeV and an integral luminosity of 100 fb–1, the LHC collider can offer much more precise information on the parameter of Z–Z' mixing and the mass M 2 than can be obtained using the ILC leptonic collider (0.5 TeV). 相似文献
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Based on a simplified model including a singlet vector-like top quark T with charge |Q|=2/3,we analyze the prospects of observing T via the single T production in the tZ channel with Z decaying to neutrinos at the hadronhadron colliders.This simplified model only includes two free parameters,the coupling constant g* and the T quark mass mT.To investigate the observability of the single T production,we perform a detailed background analysis and detector simulation for the co... 相似文献
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The matrix elements squared of processes \(q\bar q \to g\tilde \gamma \tilde \gamma , qg \to q\tilde \gamma \tilde \gamma \) are calculated and a factorization in the soft gluon limit is obtained. Three-body phase space corresponding to experimental cuts is analysed. It is shown that the detection of SUSY particles at the UNK and the SSC in “pure monojet” events, generated by these processes, is possible only in the case of a light scalar neutrino. 相似文献
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13.
《Nuclear Physics B》1988,297(2):221-243
This paper considers the decay of a standard model Higgs boson into a tau pair, as a possible signature at the SSC or LHC for a Higgs boson of mass between 110 and 160 GeV. The production of the Higgs in association with a large transverse momentum jet is considered, since this may aid in reconstructing the Higgs mass. The background from the production of tau pairs via virtual photons and Z's is studied. We comment on the possible use of this process to search for a light Higgs at the Tevatron collider. 相似文献
14.
We discuss various reactions at futuree
+
e
– and colliders involving real (beamstrahlung or backscattered laser) or quasi-real (bremsstrahlung) photons in the initial state and hadrons in the final state. The production of two central jets with large transverse momentump
T
is described in some detail; we give distributions for the rapidity andp
T
of the jets as well as the di-jet invariant mass, and discuss the relative importance of various initial state configurations and the uncertainties that arise from the at present rather poor knowledge of the parton content of the photon. We also present results for mono-jet production where one jet goes down a beam pipe, for the production of charm, bottom and top quarks, and for single production ofW andZ bosons. Where appropriate, the two-photon processes are compared with annihilation reactions leading to similar final states. We also argue that the behaviour of the total inelastic cross section at high energies will probably have little impact on the severity of background problems caused by soft and semi-hard (minijet) two-photon reactions. We find very large differences in cross sections for all two-photon processes between existing desings for futuree
+
e
– colliders, due to the different beamstrahlung spectra; in particular, both designs with 1 and 1 events per bunch crossing exist. The number of hadronic two-photon events is expected to rise quickly with the beam energy. Hadronic backgrounds will be even worse if thee
+
e
– collider is converted into a collider. 相似文献
15.
The potential for measuring the Z‘WW coupling with the ATLAS detector at the LHC is investigated under conditions of low and high luminosity. It is estimated
that detection of the decay channel Z’ → WW → lν
l
jj is possible with 300 fb
−1, for a Z’ boson with sequential model couplings and with a mass up to 2.2 TeV. 相似文献
16.
《Nuclear Physics B》1995,447(1):3-17
We study the prospects for detecting light charged Higgs scalars (H±) at future e+e− colliders. Various two-Higgs-doublet models (2HDM) and a general multi-Higgs-doublet model (MHDM) are considered, all of which may contain a H± in the discovery range of LEP2. The potentially troublesome cases of MH± ∼ MW and MH± ∼ MZ are discussed, as well as ways of distinguishing the different models. 相似文献
17.
We present the predictions of the Glashow-Weinberg-Salam [1] (GWS) model for the total cross-section and the angular and invariantmass differential cross sections for the reaction \(p\bar p \to W^ + W^ - X\) . We contrast these GWS predictions with those obtained by varying the anomalous magnetic moment of theW(κ), the analogue for theZWW coupling (κ z ) and the relative strength of the γWW andZWW couplings (ω) from their GWS values. We find that changes in these parameters produce significant changes in both the total cross section and the angular and invariant mass differential cross sections. We also present the angular distribution of the decay leptons (W +→/+v l) and find in all cases it closely mirrors theW + angular distribution. We have given the intermediate results for the dominant quark subprocesses \((u\bar u \to W^ + W^ - ,d\bar d \to W^ + W^ - )\) . 相似文献
18.
Bernd A. Kniehl 《Zeitschrift fur Physik C Particles and Fields》1992,55(4):605-618
The \(ZHf\bar f\) four-point function is calculated in the one-loop approximation of the Standard Model and full analytic results are presented. The loop contributions due to both light and new heavy fermions are inspected in detail. The dominant mechanisms of Higgs-boson production from fermions are compared. The effect of radiative corrections on the cross section of \(f\bar f \to ZH\) including bremsstrahlung is studied. The spectrum of hard bremsstrahlung is integrated analytically. The implications for Higgs-boson searches at futuree + e ? colliders in the energy range 200 \(200GeV \le \sqrt s \le 1.5TeV\) , which includes both LEP 2 and the Next Linear Collider, are analyzed. ForM H <2m t weak corrections in the modified on-mass-shell scheme are generally negative and feebly vary withM H , while forM H >2m t , they strongly increase withM H and may take large positive values. Electromagnetic corrections dramatically reduce the cross section close to theZH-production threshold, while they may considerably enhance it far above this threshold. 相似文献
19.
《Physics letters. [Part B]》1986,173(3):341-345
Single scalar muon production is examined in detail which results in a final state particularly favourable for detection: two strongly acollinear muons plus large missing energy. Cross sections, missing energy and angular distributions are given. A strong dependence on the zino total width, common to all single production channel, is found. 相似文献
20.
《中国物理C(英文版)》2018,(11)
We briefly comment on the paper by Albaladejo et al., Chinese Phys. C 41 121001, rejecting its conclusions. 相似文献