Belle

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2017-09-20
15:53
OpenAccess [PUBDB-2017-10930] Preprint/Report
; ; ; et al
Measurements of the absolute branching fractions of $B^{+} \to X_{c\bar{c}} K^{+}$ and $B^{+} \to \bar{D}^{(\ast) 0} \pi^{+} $ at Belle
[arXiv:1709.06108]
 GO
We present the measurement of the absolute branching fractions of $B^{+} \to X_{c\bar{c}} K^{+}$ and $B^{+} \to \bar{D}^{(\ast) 0} \pi^{+} $ decays, using a data sample of $772\times10^{6}$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. Here, $X_{c\bar{c}}$ denotes $\eta_{c}$, $J/\psi$, $\chi_{c0}$, $\chi_{c1}$, $\eta_{c}(2S)$, $\psi(2S)$, $\psi(3770)$, $X(3872)$, and $X(3915)$. [...]
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2017-09-20
15:46
OpenAccess [PUBDB-2017-10929] Preprint/Report
; ; ; et al
Angular analysis of the $e^+ e^- \to D^{(*) \pm} D^{* \mp}$ process near the open charm threshold using initial-state radiation
[BELLE-PREPRINT-2017-15; KEK-PREPRINT-2017-16; arXiv:1707.09167]
 GO
We report a new measurement of the exclusive $e^+ e^- \to D^{(*) \pm} D^{*\mp}$ cross sections as a function of the center-of-mass energy from the $D^{(*) \pm} D^{* \mp}$ threshold through $\sqrt{s}=6.0$ GeV with initial-state radiation. The analysis is based on a data sample collected with the Belle detector with an integrated luminosity of $951$ fb$^{-1}$. [...]
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2017-09-20
15:41
OpenAccess [PUBDB-2017-10928] Preprint/Report
; ; ; et al
Study of $\eta$ and dipion transitions in $\Upsilon(4S)$ decays to lower bottomonia
[BELLE-PREPRINT-2017-16; KEK-PREPRINT-2017-17; arXiv:1707.04973]
 GO
We study hadronic transitions between bottomonium states using 496 fb$^{-1}$ data collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^{+}e^{-}$ collider. We measure: ${\cal B}(\Upsilon(4S)\to\pi^+\pi^-\Upsilon(1S))=(8.2\pm 0.5 {\rm(stat.)} \pm 0.4 {\rm(syst.)})\times10^{-5}$, ${\cal B}(\Upsilon(4S)\to\pi^+\pi^-\Upsilon(2S))=(7.9\pm 1.0 {\rm(stat.)} \pm 0.4 {\rm(syst.)})\times10^{-5}$, and ${\cal B}(\Upsilon(4S)\to\eta\Upsilon(1S))=(1.70\pm 0.23 {\rm(stat.)} \pm 0.08 {\rm(syst.)})\times10^{-4}$. [...]
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2017-09-20
15:37
OpenAccess [PUBDB-2017-10927] Preprint/Report
; ; ; et al
Evidence for Isospin Violation and Measurement of $CP$ Asymmetries in $B \to K^{\ast}(892) \gamma$
[BELLE-PREPRINT-2017-08; KEK-PREPRINT-2017-4; arXiv:1707.00394]
 GO
We report the first evidence for isospin violation in $B \to K^* \gamma$ and the first measurement of difference of $CP$ asymmetries between $B^+ \to K^{*+} \gamma$ and $B^0 \to K^{*0} \gamma$. This analysis is based on the data sample containing $772 \times 10^6 B\bar{B}$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric $e^+ e^-$ collider. [...]
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2017-09-20
15:32
OpenAccess [PUBDB-2017-10926] Preprint/Report
; ; ; et al
Search for $\Lambda_c^+\to\phi p \pi^0$ and measurement of $\Lambda_c^+\to K^-\pi^+ p \pi^0$ decays
[BELLE-PREPRINT-2017-12; KEK-PREPRINT-2017-08; UCHEP-2017-06; arXiv:1707.00089]
 GO
We have searched for the Cabibbo-suppressed decay $\Lambda_c^+\to\phi p\pi^0$ in $e^+e^-$ collisions using a data sample corresponding to an integrated luminosity of 915 $\rm fb^{-1}$. The data were collected by the Belle experiment at the KEKB $e^+e^-$ asymmetric-energy collider running at or near the $\Upsilon(4S)$ and $\Upsilon(5S)$ resonances. [...]
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2017-09-20
15:27
OpenAccess [PUBDB-2017-10925] Preprint/Report
; ; ; et al
Production cross sections of hyperons and charmed baryons from $e^+e^-$ annihilation near $\sqrt{s} =$ 10.52 GeV
[BELLE-PREPRINT-2017-14; KEK-PREPRINT-2017-15; arXiv:1706.06791]
 GO
We measure the inclusive production cross sections of hyperons and charmed baryons from $e^+e^-$ annihilation using a 800 fb$^{-1}$ data sample taken near the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The feed-down contributions from heavy particles are subtracted using our data, and the direct production cross sections are presented for the first time. [...]
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2017-09-20
15:12
OpenAccess [PUBDB-2017-10924] Report/Journal Article
; ; ; et al
Invariant-mass and fractional-energy dependence of inclusive production of di-hadrons in $e^+e^-$ annihilation at $\sqrt{s}=$ 10.58 GeV
[BELLE-DRAFT-2017-13-; KEK-DRAFT-2017-09; arXiv:1706.08348; BELLE-DRAFT-2017-13-KEK-DRAFT-2017-09] ddc:530
The inclusive cross sections for dihadrons of charged pions and kaons $(e^+ e^- \to hhX)$ 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. [...]
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2017-09-14
13:42
OpenAccess [PUBDB-2017-10774] Report/Journal Article
; ; ; et al
Measurement of branching fraction and direct $CP$ asymmetry in charmless $B^+ \to K^+K^- \pi^+$ decays at Belle
[KEK-PREPRINT-2017-5; BELLE-PREPRINT-2017-09; arXiv:1705.02640] ddc:530
We report a study of the charmless hadronic decay of the charged B meson to the three-body final state $K^+ K^- \pi^+$. The results are based on a data sample that contains 772×10$^6$ BB pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider [...]
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2017-09-14
13:19
OpenAccess [PUBDB-2017-10772] Report/Journal Article
; ; ; et al
Measurement of the branching fraction and $CP$ asymmetry in $B^{0} \to \pi^{0}\pi^{0}$ decays, and an improved constraint on $\phi_{2}$
[BELLE-PREPRINT-2017-11; KEK-PREPRINT-2017-7; arXiv:1705.02083] ddc:530
We measure the branching fraction and CP violation asymmetry in the decay $B^{0}\to \pi^0\pi^0$, using a data sample of 752×10$^6$ BB 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 $\mathfrak{B}(B\to \pi^0\pi^0)$ = [1.31$\pm$0.19(stat)$\pm$0.19(syst)] × 10$^{-6}$ and A$_{CP}$=+0.14$\pm$0.36(stat)$\pm$0.10(syst), respectively. [...]
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2017-08-28
11:32
OpenAccess [PUBDB-2017-09977] Preprint/Report
; ; ; et al
Thermal mock-up studies of the DEPFET pixel vertex detector for Belle II
[arXiv:1607.00663]
 GO
The Belle II experiment currently under construction at the $e^+e^-$-collider SuperKEKB in Japan is designed to explore new physics beyond the standard model with an approximately 50 times larger data sample compared to its predecessor. The vertex detector (VXD), comprising a two layer DEPFET pixel detector (PXD) surrounded by four layers of double sided silicon strip detector (SVD), is indispensable for the accurate determination of the decay point of $B$ or $D$ meson as well as track reconstruction of low momentum particles. [...]
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