Precise measurement of the Higgs boson properties is an important issue of the International Linear Collider (ILC) experiment to verify the particles mass generation mechanism that the coupling strength between the Higgs boson and the fermions or vector bosons are proportional to the mass of each particle. Thus the measurement of the branching ratio of the Higgs boson an important issue to understand the mass of each particle. In this analysis, measurement accuracy of the Higgs boson branching ratio in the ZH->qqH hadronic decay mode was studied with the cut-based analysis in Higgs mass of M_{H}=120 GeV at the center-of-mass energy of \sqrt{s}=250 GeV with the ILD detector model. From the analysis, we estimate the measurement accuracy of the relative Higgs boson branching ratio of BR(H->cc)$ to BR(H->bb) as 13.68\%.
A search for a massive $W'$ gauge boson decaying to a top quark and a bottom quark is performed with the ATLAS detector in $pp$ collisions at the LHC. The dataset was taken at a centre-of-mass energy of $\sqrt{s} = 8$ TeV and corresponds to 20.3 fb$^{-1}$ of integrated luminosity. This analysis is done in the hadronic decay mode of the top quark, where novel jet substructure techniques are used to identify jets from high-momentum top quarks. This allows for a search for high-mass $W'$ bosons in the range $1.5 - 3.0$ TeV. $b$-tagging is used to identify jets originating from $b$-quarks. The dat…
Measurement of Higgs branching ratio is necessary to investigate Higgs coupling to particle masses. Especially, it is the most important program to measure the branching ratio of H->bb and H->cc at the international linear collider (ILC). We have studied the measurement accuracy of Higgs branching ratio at ILC with Sqrt(s) = 250 GeV by using ZH->vvH events. We obtained the Higgs branching ratio with 1.1% and 13.7% accuracy for H->bb and H->cc, respectively.
The investigation of the properties of a Higgs boson, especially a test of the predicted linear dependence of the branching ratios on the mass of the final state, is currently one of the most compelling arguments for building a linear collider. We demonstrate that the large Higgs boson production cross section at a 3 TeV CLIC machine allows for a precision measurement of the Higgs branching ratios. The cross section times branching ratio of the decays H \rightarrow b^{-}b, H \rightarrow cc^{-} and H \rightarrow μμ can be measured with a statistical uncertainty of 0.22%, 3.2% and 15%, respectiv…
The Standard Model predicts a branching ratio for the decay mode Bs -> mu mu of (3.4 +/- 0.5)10e-9, while some SUSY models predict enhancements up to 2 orders of magnitude. It is expected that at the end of its life Tevatron will set and exclusion limit for this branching ratio of the order of 10e-8, leaving one order of magnitude to explore. The excellent vertex reconstruction, invariant mass resolution and muon identification of the LHCb detector make it well suited to observe a branching ratio in this range in the first years of running of LHC. In this article an overview of the analysis th…
The absolute branching ratio of the $K^+ \rightarrow π^+π^-π^+(γ)$ decay, inclusive of final-state radiation, has been measured using $\sim$17 million tagged $K^+$ mesons collected with the KLOE detector at DA$Φ$NE, the Frascati $ϕ$-factory. The result is: \[ BR(K^+ \rightarrow π^+π^-π^+(γ)) = 0.05565 \pm 0.00031_{stat} \pm 0.00025_{syst} \] a factor $\simeq$ 5 more precise with respect to the previous result. This work completes the program of precision measurements of the dominant kaon branching ratios at KLOE.
Measurements of the branching ratios of top quark decays into leptons and jets using events with $t \overline{t}$ (top antitop) pairs are reported. Events were recorded with the ATLAS detector at the LHC in pp collisions at a center-of-mass energy of 7 TeV. The collected data sample corresponds to an integrated luminosity of 4.6 ${\mathrm{fb}}^{-1}$. The measured top quark branching ratios agree with the Standard Model predictions within the measurement uncertainties of a few percent.
We report an improved measurement of $D^+ \to K_S^0 K^+$ and $D^+_s\to K_S^0 π^+$ branching ratios using 605 fb$^{-1}$ of data collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The measured branching ratios with respect to the Cabibbo-favored modes are $\mathcal{B}(D^+ \to K_S^0 K^+)/\mathcal{B}(D^+ \to K_S^0 π^+)$ = 0.1899$\pm0.0011\pm$0.0022 and $\mathcal{B}(D^+_s \to K_S^0 π^+)/\mathcal{B}(D^+_s \to K_S^0 K^+)$ = 0.0803$\pm0.0024\pm$0.0019 where the first uncertainties are statistical and the second are systematic.
We report a measurement of the ratio of branching fractions of the decays B+ ->JPsi pi+ and B+ -> Jpsi K+ using the CDF II detector at the Fermilab Tevatron Collider. The signal from the Cabbibo-suppressed B+->JPsi pi+ decay is separated from B+->JPsi K+ using the invariant mass distribution and the kinematics differences of the hadron track in the two decay modes. From a sample of 220 pb^-1 of pbar-p collisions at sqrt(s)= 1.96 TeV, we observe 91 +- 15 B+->JPsi pi+ events together with 1883 +- 34 B+->JPsi K+ events. The ratio of branching fractions is found to be Br(B+ -> JPsi pi+)/Br(B+ ->JP…
First Measurement of the Ratio of Branching Fractions BR(LAMBDAB to Lambdac Mu Nu)/BR(LAMBDAB to Lambdac Pi) at CDF II
我们提出了第一次测量的分支分数BR（LAMBDAB到LAMBDAC MU NU）/BR（LAMBDAB到LAMBDAC PI）的基础上的171.5 pb-1的ppbar碰撞的质心能量为1.96 TeV的CDF-II检测器。此外，我们还提供了BR（B 0 TO DSTAR MU NU）/BR（B 0 TO DSTAR PI）和BR（B 0 TO D MU NU）/BR（B 0 TO D PI）的测量值，这些测量值用作对照样本，以了解用于Lambdab分析的数据和Monte Carlo。我们发现对照样品的相对分支分数分别与粒子数据组在0.7和1.1西格玛水平上获得的比率一致。最后，我们得到相对λ分支分数为：BR（LAMBDAB至LAMBDAC MU NU）/BR（LAMBDAB至LAMBDAC PI）=20.0 +- 3.0（stat）+- 1.2（syst）+ 0.7 - 2.1（BR）+- 0.5（UBR）。三个相对支化率的不确定度分别来自统计学、CDF内部系统学、外部测量分支比和未测量分支比。我们提出了一种方法来推导BR（LAMBDAB到LAMBDAC PI）使用以前的CDF测量，并获得BR（LAMBDAB到LAMBDAC PI）=（0.41 +- 0.19（stat + syst）+ 0.06 - 0.08（pt））%，其中最后的不确定性是由于测量的Lambdab pt光谱。结…
We present the current status of the analysis of about 1.7 billion KSKL pair events collected at DAFNE with the KLOE detector to determine the branching ratio of KS -> pi e nu decay and the lepton charge asymmetry. This sample is ~4 times larger in statistics than the one used in a previous KLOE analysis, allowing us to improve the accuracy of the measurement and of the related tests of CPT symmetry and Delta S = Delta Q rule.
We present the current status of the analysis of about 1.7 billion K_S K_L pair events collected at DAΦNE with the KLOE detector to determine the branching ratio of K_S -> πeν decay and the lepton charge asymmetry. This sample is ~4 times larger in statistics than the one used in the previous most precise result, from KLOE as well, allowing us to improve the accuracy on the measurement and related tests of CPT symmetry and Delta S = Delta Q rule.
布鲁克海文国家实验室AGS的E865收集了大约70，000个K+（e3）事件，以测量相对于观察到的K+ -> pi+ pi 0、K+ -> pi 0 mu+ nu和K+ -> pi+ pi 0衰变的K+（e3）分支比。所有衰变中的pi。使用来自pi。-> e+ e-γ衰变的e+e-对来检测，并且不需要光子。利用归一化衰变的粒子数据群分支比，我们得到BR（K+（e3（gamma））=（5.13+/-0.02（stat）+/-0.09（sys）+/-0.04（norm））%，其中$K+(e3(gamma)) includes the effect of virtual and real photons. This result is 2.3 sigma higher than the current Particle Data Group value. The implications of this result for the $ V_{us} $是CKM矩阵的元素，并讨论了矩阵的么正性.
We reconstruct B+/- -> D K+/- decays in a data sample collected by the CDF II detector at the Tevatron collider corresponding to 1 fb-1 of integrated luminosity. We select decay modes where the D meson decays to either K- pi+ (flavor eigenstate) or K- K+, pi- pi+ (CP-even eigenstates), and measure the direct CP asymmetry A_CP+ = 0.39 +/- 0.17(stat) +/- 0.04(syst), and the double ratio of CP-even to flavor eigenstate branching fractions R_CP+ = 1.30 +/- 0.24(stat) +/- 0.12(syst). These measurements will improve the determination of the CKM angle gamma. They are performed here for the first time…
