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Series

Kennesaw State University

2017

Articles 1 - 22 of 22

Full-Text Articles in Physics

Search For Light Tetraquark States In Υ ( 1 S ) And Υ ( 2 S ) Decays, S. Jia Et Al., David Joffe, Ratnappuli L. Kulasiri Dec 2017

Search For Light Tetraquark States In Υ ( 1 S ) And Υ ( 2 S ) Decays, S. Jia Et Al., David Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We search for the JPC=0−− and 1+− light tetraquark states with masses up to 2.46 GeV/c2 in Υ(1S) and Υ(2S) decays with data samples of (102±2) million and (158±4) million events, respectively, collected with the Belle detector. No significant signals are observed in any of the studied production modes, and 90% credibility level (C.L.) upper limits on their branching fractions in Υ(1S)and Υ(2S) decays are obtained. The inclusive branching fractions of the Υ(1S) and Υ(2S) decays into final states with f1(1285) are measured to be B(Υ(1S)→f1(1285)+anything)=(46±28(stat)±13(syst))×10−4 and B(Υ(2S)→f1(1285)+anything)=(22±15(stat)±6.3(syst))×10−4. The measured χb2→J/ψ+anything branching fraction is measured to be (1.50±0.34(stat)±0.22(syst))×10−3, and 90% …

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Evidence For Isospin Violation And Measurement Of C P Asymmetries In B → K ∗ ( 892 ) Γ, T. Horiguchi Et Al., D. Joffe, Ratnappuli L. Kulasiri Nov 2017

Evidence For Isospin Violation And Measurement Of C P Asymmetries In B → K ∗ ( 892 ) Γ, T. Horiguchi Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We report the first evidence for isospin violation in B→K∗γ and the first measurement of the difference of CP asymmetries between B+→K*+γ and B0→K*0γ. This analysis is based on the data sample containing 772×106B¯B pairs that was collected with the Belle detector at the KEKB energy-asymmetric e+e− collider. We find evidence for the isospin violation with a significance of 3.1σ, Δ0+=[+6.2±1.5(stat)±0.6(syst)±1.2(f+−/f00)]%, where the third uncertainty is due to the uncertainty on the fraction of B+B− to B0¯B0 production in Υ(4S) decays. The measured value is consistent with predictions of the standard model. The result for the difference of CP asymmetries …

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Measurement Of The Decays B → Η ℓ Ν ℓ And B → Η ′ ℓ Ν ℓ In Fully Reconstructed Events At Belle, C. Beleño Et Al., D. Joffe, Ratnappuli L. Kulasiri Nov 2017

Measurement Of The Decays B → Η ℓ Ν ℓ And B → Η ′ ℓ Ν ℓ In Fully Reconstructed Events At Belle, C. Beleño Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We report branching fraction measurements of the decays B+→ηℓ+νℓ and B+→η′ℓ+νℓ based on 711 fb−1 of data collected near the Υ(4S) resonance with the Belle experiment at the KEKB asymmetric-energy e+e− collider. This data sample contains 772 million B¯B events. One of the two Bmesons is fully reconstructed in a hadronic decay mode. Among the remaining (“signal-B”) daughters, we search for the η meson in two decay channels, η→γγ and η→π+π−π0, and reconstruct the η′meson in η′→ηπ+π− with subsequent decay of the η into γγ. Combining the two η modes and using an extended maximum likelihood, the B+→ηℓ+νℓ branching fraction …

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Search For Cp Violation And Measurement Of The Branching Fraction In The Decay D0 → K0 Sk0 S, N. Dash Et Al., D. Joffe, Ratnappuli L. Kulasiri Oct 2017

Search For Cp Violation And Measurement Of The Branching Fraction In The Decay D0 → K0 Sk0 S, N. Dash Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We report a study of the decay D0→K0SK0S using 921  fb−1 of data collected at or near the Υ(4S) and Υ(5S) resonances with the Belle detector at the KEKB asymmetric energy e+e− collider. The measured time-integrated CP asymmetry is ACP(D0→K0SK0S)=(−0.02±1.53±0.02±0.17)%, and the branching fraction is B(D0→K0SK0S)=(1.321±0.023±0.036±0.044)×10−4, where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode (D0→K0Sπ0). These results are significantly more precise than previous measurements available for this mode. The ACP measurement is consistent with the standard model expectation.

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Charged Higgs Production With A W Boson Via B-Quark Annihilatiom, Nikolaos Kidonakis Sep 2017

Charged Higgs Production With A W Boson Via B-Quark Annihilatiom, Nikolaos Kidonakis

Faculty and Research Publications

I present theoretical calculations for charged Higgs production in association with a W boson via bottom quark annihilation. I discuss higher-order radiative corrections from collinear and soft gluon emission and show that they are important. I present theoretical results for total cross sections, and for transverse-momentum and rapidity distributions of the charged Higgs boson at LHC energies.

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Top-Pair And Tw Production At Approximate N3lo, Nikolaos Kidonakis Sep 2017

Top-Pair And Tw Production At Approximate N3lo, Nikolaos Kidonakis

Faculty and Research Publications

I present approximate N3LO theoretical results for top-antitop pair production, and for single-top production in association with a W boson. The higher-order corrections are from soft-gluon radiation, which is dominant near partonic threshold. I present results for total cross sections as well as transverse-momentum and rapidity distributions of the top quark, and compare with data at LHC energies.

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Study Of Η And Dipion Transitions In Υ(4 S) Decays To Lower Bottomonia, E. Guido Et Al., D. Joffe, Ratnappuli L. Kulasiri Sep 2017

Study Of Η And Dipion Transitions In Υ(4 S) Decays To Lower Bottomonia, E. Guido Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We study hadronic transitions between bottomonium states using 496 fb−1 data collected at the Υ(4S)resonance with the Belle detector at the KEKB asymmetric energy e+e− collider. We measure B(Υ(4S)→π+π−Υ(1S))=(8.2±0.5(stat)±0.4(syst))×10−5, B(Υ(4S)→π+π−Υ(2S))=(7.9±1.0(stat)±0.4(syst))×10−5, and B(Υ(4S)→ηΥ(1S))=(1.70±0.23(stat)±0.08(syst))×10−4. We measure the ratio of branching fractions R=B(Υ(4S)→ηΥ(1S))/B(Υ(4S)→π+π−Υ(1S))=2.07±0.30(stat)±0.11(syst). We search for the decay Υ(13D1,2)→ηΥ(1S), but do not find significant evidence for such a transition. We also measure the initial-state radiation production cross sections of the Υ(2S,3S) resonances and we find values compatible with the expected ones. Finally, the analysis of the Υ(4S)→π+π−Υ(1S)events shows indications for a resonant contribution due to the f0(980) meson.

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Charged Higgs Production With A W Boson Or A Top Quark, Nikolaos Kidonakis Sep 2017

Charged Higgs Production With A W Boson Or A Top Quark, Nikolaos Kidonakis

Faculty and Research Publications

I present theoretical results for charged Higgs production in association with a W boson or a top quark at the LHC. I calculate higher-order threshold corrections and show that they are very significant. I present detailed results for total cross sections as well as transverse-momentum and rapidity distributions for various LHC energies.

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Search For Λ + C → Φ P Π 0 And Branching Fraction Measurement Of Λ + C → K − Π + P Π 0, B. Pal Et Al., D. Joffe, Ratnappuli L. Kulasiri Sep 2017

Search For Λ + C → Φ P Π 0 And Branching Fraction Measurement Of Λ + C → K − Π + P Π 0, B. Pal Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We have searched for the Cabibbo-suppressed decay Λ+c→ϕpπ0 in e+e− collisions using a data sample corresponding to an integrated luminosity of 915 fb−1. The data were collected by the Belle experiment at the KEKB e+e− asymmetric-energy collider running at or near the Υ(4S) and Υ(5S)resonances. No significant signal is observed, and we set an upper limit on the branching fraction of B(Λ+c→ϕpπ0)<15.3×10−5 at 90% confidence level. The contribution of nonresonant Λ+c→K+K−pπ0 decays is found to be consistent with zero, and the corresponding upper limit on its branching fraction is set to be B(Λ+c→K+K−pπ0)NR<6.3×10−5 at 90% confidence level. We also search for an intermediate hidden-strangeness pentaquark decay P+s→ϕp. We see no evidence for this intermediate decay and set an upper limit on the product branching fraction of B(Λ+c→P+sπ0)×B(P+s→ϕp)<8.3×10−5 at 90% confidence level. Finally, we measure the branching fraction for the Cabibbo-favored decay Λ+c→K−π+pπ0; the result is B(Λ+c→K−π+pπ0)=(4.42±0.05(stat)±0.12(syst)±0.16(norm))%, which is the most precise measurement to date.

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Invariant-Mass And Fractional-Energy Dependence Of Inclusive Production Of Dihadrons In E + E − Annihilation At √ S = 10.58 Gev, R. Seidl Et Al., D. Joffe, Ratnappuli L. Kulasiri Aug 2017

Invariant-Mass And Fractional-Energy Dependence Of Inclusive Production Of Dihadrons In E + E − Annihilation At √ S = 10.58 Gev, R. Seidl Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

The inclusive cross sections for dihadrons of charged pions and kaons (e+e−→hhX) in electron-positron annihilation are reported. They are obtained as a function of the total fractional energy and invariant mass for any di-hadron combination in the same hemisphere as defined by the thrust event-shape variable and its axis. Since same-hemisphere dihadrons can be assumed to originate predominantly from the same initial parton, di-hadron fragmentation functions are probed. These di-hadron fragmentation functions are needed as an unpolarized baseline in order to quantitatively understand related spin-dependent measurements in other processes and to apply them to the extraction of quark transversity distribution …

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Measurement Of The Branching Fraction And Cp Asymmetry In B 0 → Π 0Π 0 Decays, And An Improved Constraint On Φ2, T. Julius Et Al., D. Joffe, Ratnappuli L. Kulasiri Aug 2017

Measurement Of The Branching Fraction And Cp Asymmetry In B 0 → Π 0Π 0 Decays, And An Improved Constraint On Φ2, T. Julius Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We measure the branching fraction and CP violation asymmetry in the decay B0→π0π0, using a data sample of 752×106 B¯B pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB e+e− collider. The obtained branching fraction and direct CP asymmetry are B(B→π0π0)=[1.31±0.19(stat)±0.19(syst)]×10−6 and ACP=+0.14±0.36(stat)±0.10(syst), respectively. The signal significance, including the systematic uncertainty, is 6.4 standard deviations. We combine these results with Belle’s earlier measurements of B0→π+π− and B±→π±π0 to exclude the CP-violating parameter ϕ2 from the range 15.5°<ϕ2

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Measurement Of Branching Fraction And Direct Cp Asymmetry In Charmless B+ → K+K−Π + Decays At Belle, C.-L. Hsu Et Al., D. Joffe, Ratnappuli L. Kulasiri Aug 2017

Measurement Of Branching Fraction And Direct Cp Asymmetry In Charmless B+ → K+K−Π + Decays At Belle, C.-L. Hsu Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We report a study of the charmless hadronic decay of the charged B meson to the three-body final state K+K−π+. The results are based on a data sample that contains 772×106  B¯B pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The measured inclusive branching fraction and direct CP asymmetry are (5.38±0.40±0.35)×10−6 and −0.170±0.073±0.017, respectively, where the first uncertainties are statistical and the second are systematic. The K+K− invariant mass distribution of the signal candidates shows an excess in the region below 1.5  GeV/c2, which is consistent with the previous studies from BABAR …

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Measurement Of The Michel Parameters (, Ξκ) In The Radiative Leptonic Decay Of Τ, N. Shimizu Et Al., David Joffe, Ratnappuli L. Kulasiri Jun 2017

Measurement Of The Michel Parameters (, Ξκ) In The Radiative Leptonic Decay Of Τ, N. Shimizu Et Al., David Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We present the first measurement of the Michel parameters ¯η and ξκ in the radiative leptonic decay of the τ lepton using 703 fb−1 of data collected with the Belle detector at the KEKB e +e − collider. The Michel parameters are measured by an unbinned maximum likelihood fit to the kinematic information of e +e − → τ +τ − → (π +π 0ν¯)(l −ννγ¯ ) (l = e or µ). The preliminary values of the measured Michel parameters are ¯η = −2.0 ± 1.5 ± 0.8 and ξκ = 0.6 ± 0.4 ± 0.2, where the first error …

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Observation Of An Alternative Χ_{C0}(2p) Candidate In E^{+}E^{-}→J/Ψdd[Over ¯], K. Chilikin Et Al., D. Joffe, Ratnappuli L. Kulasiri Jun 2017

Observation Of An Alternative Χ_{C0}(2p) Candidate In E^{+}E^{-}→J/Ψdd[Over ¯], K. Chilikin Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We perform a full amplitude analysis of the process e+e−→J/ψD¯D, where D refers to either D0 or D+. A new charmoniumlike state X∗(3860) that decays to D¯D is observed with a significance of 6.5σ. Its mass is (3862+26−32 +40−13)  MeV/c2, and its width is (201+154−67 +88−82)  MeV. The JPC=0++ hypothesis is favored over the 2++ hypothesis at the level of 2.5σ. The analysis is based on the 980  fb−1 data sample collected by the Belle detector at the asymmetric-energy e+e− collider KEKB.

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First Measurement Of T-Odd Moments In D^{0}→K_{S}^{0}Π^{+}Π^{-}Π^{0} Decays, K. Pransanth Et Al., D. Joffe, Ratnappuli L. Kulasiri May 2017

First Measurement Of T-Odd Moments In D^{0}→K_{S}^{0}Π^{+}Π^{-}Π^{0} Decays, K. Pransanth Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We report the first measurement of the T-odd moments in the decay D0→K0Sπ+π−π0 from a data sample corresponding to an integrated luminosity of 966 fb−1 collected by the Belle experiment at the KEKB asymmetric-energy e+e− collider. From these moments we determine the CP-violation-sensitive asymmetry aT-oddCP=[−0.28±1.38(stat.)+0.23−0.76(syst.)]×10−3, which is consistent with no CP violation. In addition, we perform aT−oddCP measurements in different regions of the D0→K0Sπ+π−π0 phase space; these are also consistent with no CP violation.

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Measurement Of The Τ Lepton Polarization And R(D^{*}) In The Decay B[Over ¯]→D^{*}Τ^{-}Ν[Over ¯]_{Τ}, S. Hirose Et Al., D. Joffe, Ratnappuli L. Kulasiri May 2017

Measurement Of The Τ Lepton Polarization And R(D^{*}) In The Decay B[Over ¯]→D^{*}Τ^{-}Ν[Over ¯]_{Τ}, S. Hirose Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We report the first measurement of the τ lepton polarization Pτ (D ∗ ) in the decay B¯ → D ∗ τ −ν¯τ as well as a new measurement of the ratio of the branching fractions R(D ∗ ) = B(B¯ → D ∗ τ −ν¯τ )/B(B¯ → D ∗ ` −ν¯`), where ` − denotes an electron or a muon, and the τ is reconstructed in the modes τ − → π −ντ and τ − → ρ −ντ . We use the full data sample of 772×106 BB¯ pairs recorded with the Belle detector at the KEKB electron-positron …

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Higher-Order Radiative Corrections For B ¯B → H−W+, Nikolaos Kidonakis Apr 2017

Higher-Order Radiative Corrections For B ¯B → H−W+, Nikolaos Kidonakis

Faculty and Research Publications

I present higher-order radiative corrections from collinear and soft gluon emission for the associated production of a charged Higgs boson with a W boson. The calculation uses expressions from resummation at next-to-leading-logarithm accuracy. From the resummed cross section I derive approximate next-to-next-to-leading order (aNNLO) cross sections for the process b ¯b → H−W+ at LHC energies. The transverse-momentum and rapidity distributions of the charged Higgs boson are also calculated at aNNLO.

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Lepton-Flavor-Dependent Angular Analysis Of B→K^{*}ℓ^{+}ℓ^{-}, S. Wehle Et Al., D. Joffe, Ratnappuli L. Kulasiri Mar 2017

Lepton-Flavor-Dependent Angular Analysis Of B→K^{*}ℓ^{+}ℓ^{-}, S. Wehle Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We present a measurement of angular observables and a test of lepton flavor universality in the B → K∗ ` +` − decay, where ` is either e or µ. The analysis is performed on a data sample corresponding to an integrated luminosity of 711 fb−1 containing 772 × 106 BB¯ pairs, collected at the Υ(4S) resonance with the Belle detector at the asymmetric-energy e +e − collider KEKB. The result is consistent with Standard Model (SM) expectations, where the largest discrepancy from a SM prediction is observed in the muon modes with a local significance of 2.6σ.

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Precise Determination Of The Ckm Matrix Element |Vcb| With B¯0 → D∗ + ` − Ν¯` Decays With Hadronic Tagging At Belle, A. Abdesselam Et Al., D. Joffe, Ratnappuli L. Kulasiri Feb 2017

Precise Determination Of The Ckm Matrix Element |Vcb| With B¯0 → D∗ + ` − Ν¯` Decays With Hadronic Tagging At Belle, A. Abdesselam Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

The precise determination of the CKM matrix element |Vcb| is important for carrying out tests of the flavour sector of the Standard Model. In this article we present a preliminary analysis of the B¯0→D∗+ℓ−ν¯ℓ decay mode and its charge conjugate, selected in events that contain a fully reconstructed B-meson, using 772 million e+e−→Υ(4S)→BB¯ events recorded by the Belle detector at KEKB. Unfolded differential decay rates of four kinematic variables fully describing the B¯0→D∗+ℓ−ν¯ℓdecay in the B-meson rest frame are presented. We measure the total branching fraction (B¯0→D∗+ℓ−ν¯ℓ)=(4.95±0.11±0.22)×10−2, where the errors are statistical and systematic respectively. The value of |Vcb| is …

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Observation Of D^{0}→Ρ^{0}Γ And Search For Cp Violation In Radiative Charm Decays, T. Nanut Et Al., D. Joffee, Ratnappuli L. Kulasiri Jan 2017

Observation Of D^{0}→Ρ^{0}Γ And Search For Cp Violation In Radiative Charm Decays, T. Nanut Et Al., D. Joffee, Ratnappuli L. Kulasiri

Faculty and Research Publications

We report the first observation of the radiative charm decay D0→ρ0γ and the first search for CP violation in decays D0→ρ0γ, ϕγ, and ¯K*0(892)γ, using a data sample of 943 fb−1 collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. The branching fraction is measured to be B(D0→ρ0γ)=(1.77±0.30±0.07)×10−5, where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries ACP(D0→ρ0γ)=+0.056±0.152±0.006, ACP(D0→ϕγ)=−0.094±0.066±0.001, and ACP(D0→¯K*0γ)=−0.003±0.020±0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D0→ϕγ)=(2.76±0.19±0.10)×10−5 and B(D0→¯K*0γ)=(4.66±0.21±0.21)×10−4.

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Search For The 0^{--} Glueball In ϒ(1s) And ϒ(2s) Decays, S. Jia Et Al., D. Joffe, Ratnappuli L. Kulasiri Jan 2017

Search For The 0^{--} Glueball In ϒ(1s) And ϒ(2s) Decays, S. Jia Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty and Research Publications

We report the first search for the J P C = 0−− glueball in Υ(1S) and Υ(2S) decays with data samples of (102 ± 2) million and (158 ± 4) million events, respectively, collected with the Belle detector. No significant signals are observed in any of the proposed production modes, and the 90% credibility level upper limits on their branching fractions in Υ(1S) and Υ(2S) decays are obtained. The inclusive branching fractions of the Υ(1S) and Υ(2S) decays into final states with a χc1 are measured to be B(Υ(1S) → χc1 + anything) = (1.90 ± 0.43(stat.) ± 0.14(syst.)) × …

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Search For B− → Μ −Ν¯Μ Decays At The Belle Experiment, A. Sibidanov Et Al., Ratnappuli L. Kulasiri Jan 2017

Search For B− → Μ −Ν¯Μ Decays At The Belle Experiment, A. Sibidanov Et Al., Ratnappuli L. Kulasiri

Faculty and Research Publications

We report the result of a search for the decay B−→μ−ν¯μ. The signal events are selected based on the presence of a high momentum muon and the topology of the rest of the event showing properties of a generic B-meson decay, as well as the missing energy and momentum being consistent with the hypothesis of a neutrino from the signal decay. We find a 2.4 standard deviation excess above background including systematic uncertainties, which corresponds to a branching fraction of (B−→μ−ν¯μ)=(6.46±2.22±1.60)×10−7 or a frequentist 90% confidence level interval on the B−→μ−ν¯μ branching fraction of [2.9,10.7]×10−7. This result is obtained from …

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