arXiv subjects

Steven Blusk

Publications and source records attributed to Steven Blusk.

6 recordsLinked to original sources

arXiv2017

Signal coupling to embedded pitch adapters in silicon sensors

We have examined the effects of embedded pitch adapters on signal formation in n-substrate silicon microstrip sensors with data from beam tests and simulation. According to simulation, the presence of the pitch adapter metal layer changes the electric field inside the sensor, resulting in slowed signal formation on the nearby strips and a pick-up effect on the pitch adapter. This can result in an inefficiency to detect particles passing through the pitch adapter region. All these effects have been observed in the beam test data.

physics.ins-det↗

arXiv2015

Testbeam studies of pre-prototype silicon strip sensors for the LHCb UT upgrade project

The LHCb experiment is preparing for a major upgrade in 2018-2019. One of the key components in the upgrade is a new silicon tracker situated upstream of the analysis magnet of the experiment. The Upstream Tracker (UT) will consist of four planes of silicon strip detectors, with each plane covering an area of about 2 m$^2$. An important consideration of these detectors is their performance after they have been exposed to a large radiation dose. In this article we present test beam results of pre-prototype n-in-p and p-in-n sensors that have been irradiated with fluences up to $4.0\times10^{14}$ $n_{\rm eq}$ cm$^{-2}$.

physics.ins-det↗

arXiv2013

Measurement of the CP observables in Bs->DsK and first observation of Bsbar --> Ds^+K-pi+pi- and Bsbar --> D_{s1}(2536)^+ pi^-

First measurements of the CP observables from a time-dependent analysis of $\bar{B}^0_s\to D_s^+K^-$ decays are reported. We also present the first observation of the $\bar{B}^0_{(s)}\to D_s^+K^-π^+π^-$ and $\bar{B}^0_s\to D_s(2536)^+π^-$ decays. The $\bar{B}^0_s\to D_s^+K^-π^+π^-$ decay can be used in a similar way to $\bar{B}^0_s\to D_s^+K^-$ to measure the weak phase $γ$.

hep-ex↗

arXiv2011

B_s --> D_(s)h(h)(h) Decays in LHCb

We report recent measurements from LHCb on $B_{(s)}\to D_{(s)}h(h)(h)$ decays using $\sim$35 pb$^{-1}$ of data collected in 2010. In brief, we measure the following ratios of branching fractions: B(B^0-bar --> D^+K^-) / B(B0-bar --> D^+ pi^-) = 0.0752 +- 0.0064 +- 0.0026 B(B_s-bar --> D^0 K^{*0}) / B(B^0-bar --> D^0 rho^0) = 1.39 +- 0.31 +- 0.17 +- 0.18 B(B^0-bar --> D^+ K^- pi^+ pi^-) / B(B^0-bar --> D^+ pi^- pi^+ pi^-) = 0.052 +- 0.009 +- 0.005 B(B^- --> D^0 K^- pi^+ pi^-) / B(B^- --> D^0 pi^- pi^+ pi^-) = 0.096 +- 0.015 +- 0.008, where the uncertainties are statistical and systematic, respectively. The first of these measurements is the most precise to date, and the others are first observations.

hep-ex↗

arXiv2006

Hadronic Charm Decays in CLEO

We present several results on hadronic D meson decays. We report on results from the scan of the energy region from 3970 MeV to 4260 MeV, which was used to determine an optimal energy to carry out the D_s physics program of CLEO-c. Improved measurements of inclusive and exclusive D and D_s branching fractions are presented. We also show results on Dalitz analyses of D^+-->pi^+pi^-pi^+ using CLEO-c data and D^0--> K^+K^-pi^0 using CLEO III data.

hep-ex↗

arXiv2006

Cabibbo-Allowed and Doubly Cabibbo Suppressed D -->K pi Decays

We present measurements of the branching fractions of the decays, D-->K^0_{S,L}pi. The measured asymmetry shows that B(D^0--> K^0_S pi^0) is not equal to B(D^0--> K^0_L pi^0), as expected. We also find that B(D^+ --> K^0_S pi^+) is statistically compatible with B(D^+ --> K^0_L pi^+). Lastly, we present a recent measurement of the branching fraction of the doubly Cabibbo-suppressed decay, D^+ --> K^+ pi^0.

hep-ex↗