Abstracts - Revision history

Fantechi: /* Abstracts 2010 */

2010-03-23T22:16:06Z

‎Abstracts 2010

Fantechi: /* Abstracts 2010 */

2010-03-04T16:45:11Z

‎Abstracts 2010

Fantechi: /* Abstracts 2010 */

2010-02-10T21:29:24Z

‎Abstracts 2010

Fantechi: /* Abstracts 2010 */

2010-02-10T21:25:45Z

‎Abstracts 2010

Fantechi at 21:25, 10 February 2010

2010-02-10T21:25:17Z

Fantechi at 21:23, 10 February 2010

2010-02-10T21:23:48Z

Fantechi at 21:22, 10 February 2010

2010-02-10T21:22:38Z

Fantechi at 21:22, 10 February 2010

2010-02-10T21:22:13Z

Fantechi at 21:21, 10 February 2010

2010-02-10T21:21:49Z

Fantechi at 11:33, 23 April 2009

2009-04-23T11:33:52Z

@@ Line 114: / Line 114: @@
 architecture described would be easily exportable for other experiments,
 to build a versatile and fully customizable trigger system.
 == Abstracts 2009 ==

← Older revision		Revision as of 16:45, 4 March 2010
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	The CERN NA62 experiment aims at a 10% measurement of the BR of the K+ into a pi+ and two neutrinos. The main background is the K+ decay into a muon and a neutrino, so pion-muon separation is a crucial ingredient. The RICH detector must separate pions from muons at 3 sigma level between 15 and 35 GeV/c momentum. The RICH must also measure the pion crossing time with a 100 ps resolution to avoid fake coincidences with an upstream beam spectrometer. To fufill these requirements a RICH filled with Neon at atmospheric pressure has been chosen, with a radiator length of 17 m. A mosaic of 20 hexagonal or semi-hexagonal mirrors with 17 m focal length, placed at the downstream end of the detector, will reflect the Cherenkov light onto two spots (to avoid the shadow induced by a beam pipe crossing the detector) located at the upstream end of the RICH where 2000 photomultipliers in total will be placed. Single anode photomultipliers, put at 18 mm minimum distance among each other have been chosen to match the required time resolution and Cherenkov angle sensitivity. A prototype was built to validate the project, with the same longitudinal dimensions (17 m) but reduced transverse size with respect to the final detector. In 2007 the prototype, equipped with 96 photomultipliers and exposed to a pion beam at CERN, showed a time resolution smaller than 100 ps. In 2009 in another test beam the prototype was equipped with 414 photomultipliers and demonstrated the capability to suppress by a factor 100 the muon background with respect to charged pions in a 15-35 GeV/c momentum range. The detector, approved and fully financed, is now in its construction phase with commissioning foreseen in 2012. The details of the project and the results of the test beams will be discussed.		The CERN NA62 experiment aims at a 10% measurement of the BR of the K+ into a pi+ and two neutrinos. The main background is the K+ decay into a muon and a neutrino, so pion-muon separation is a crucial ingredient. The RICH detector must separate pions from muons at 3 sigma level between 15 and 35 GeV/c momentum. The RICH must also measure the pion crossing time with a 100 ps resolution to avoid fake coincidences with an upstream beam spectrometer. To fufill these requirements a RICH filled with Neon at atmospheric pressure has been chosen, with a radiator length of 17 m. A mosaic of 20 hexagonal or semi-hexagonal mirrors with 17 m focal length, placed at the downstream end of the detector, will reflect the Cherenkov light onto two spots (to avoid the shadow induced by a beam pipe crossing the detector) located at the upstream end of the RICH where 2000 photomultipliers in total will be placed. Single anode photomultipliers, put at 18 mm minimum distance among each other have been chosen to match the required time resolution and Cherenkov angle sensitivity. A prototype was built to validate the project, with the same longitudinal dimensions (17 m) but reduced transverse size with respect to the final detector. In 2007 the prototype, equipped with 96 photomultipliers and exposed to a pion beam at CERN, showed a time resolution smaller than 100 ps. In 2009 in another test beam the prototype was equipped with 414 photomultipliers and demonstrated the capability to suppress by a factor 100 the muon background with respect to charged pions in a 15-35 GeV/c momentum range. The detector, approved and fully financed, is now in its construction phase with commissioning foreseen in 2012. The details of the project and the results of the test beams will be discussed.
		+
		+	GPU for RT2010
		+
		+	We describe a pilot project for the use of GPUs (Graphics processing unit)
		+	in an on-line triggering application at the CERN NA62 experiment.
		+
		+	Recently the interest in using GPUs for general purpose application
		+	is growing due to the high performances achieved: the present generation
		+	of chips allows a peak computing performance of about 1 Teraflops and
		+	the next incoming generation will deliver around a factor of two more.
		+
		+	In high energy physics experiments the on-line selection is a fundamental
		+	part of the Data acquisition system, in order to reduce the bandwidth
		+	requirements and the total amount of data that have to be
		+	recorded on tape. The standard trigger systems are structured in
		+	several levels realized in custom hardware and software.
		+
		+	The computing power of the GPUs allows to imagine a real-time system
		+	in which trigger decision are taken directly in the video processor with
		+	a stable latency. This could greatly simplify the standard solutions
		+	adopted for triggering, usually based on custom FPGA or ASIC.
		+
		+	The ongoing work presented here shows the results achieved in pattern
		+	matching problems to define trigger primitives, in particular related
		+	to particle identification in the RICH detector of the NA62 experiment, where
		+	the rate of events to be analyzed will be around 10 MHz.
		+	The results obtained in simulation and lab tests are very encouraging
		+	to go towards a working prototype.
		+
		+	Due to the use of off-the-shelf technology, in continuous
		+	development for other purposes (Video Games, image editing,...), the
		+	architecture described would be easily exportable for other experiments,
		+	to build a versatile and fully customizable trigger system.

	== Abstracts 2009 ==		== Abstracts 2009 ==

@@ Line 77: / Line 77: @@
 experiments, allow measurements of the decay rate and of possible CP
 violation in this decay with per cent precision.
 == Abstracts 2009 ==

@@ Line 23: / Line 23: @@
 statistics by a factor of five. For both channels the selected events
 are almost background-free.
-  From these events, we have determined the branching fraction and form
+From these events, we have determined the branching fraction and form
 factors of K+- -> pi+- e+ e- using different theoretical models. Our
 results improve the existing world averages significantly. In addition,
@@ Line 77: / Line 77: @@
 experiments, allow measurements of the decay rate and of possible CP
 violation in this decay with per cent precision.
 == Abstracts 2009 ==

@@ Line 1: / Line 1: @@
 Measurement of BR(K --> e nu)/BR(K --> mu nu)
-=====================================
 Measurement of the helicity suppressed ratio of charged kaon leptonic decay
 rates BR(K --> e nu)/BR(K --> mu nu) has long been considered as an
@@ Line 17: / Line 16: @@
 Measurement of the FCNC Decays K+- -> pi+- l+ l-
-================================================
 We report on measurements of the rare decays K+- -> pi+- e+ e- and K+-
 -> pi+- mu+ mu-.  The full NA48/2 data set was analyzed, leading to more
@@ Line 31: / Line 30: @@
 Measurement of Ks --> pipiee decay mode
-==================================
 The Ks to pipiee decay mode has been investigated using the data collected
 in 2002 by the NA48/1 collaboration. With about 23k signal events and 59k
@@ Line 40: / Line 39: @@
 Precision Measurement of pi pi Scattering Lengths in Ke4 Decays
-===============================================================
 The measurement of the S-wave pi pi scattering lengths is a fundamental
 test of the validity of Chiral Perturbation Theory. We report on the
@@ Line 51: / Line 50: @@
 Precision Measurement of Photon Emission in K+- -> pi+- pi0 gamma Decays
-========================================================================
 We report our final result on the measurement of direct photon emission
 (DE) in the decay K+- -> pi+- pi0 gamma and its interference (INT) with
@@ Line 64: / Line 63: @@
 Measurement of the rare Decay K+- -> pi+- gamma gamma
-=====================================================
 We report on the measurement of the branching fraction of the rare decay
 K+- -> pi+- gamma gamma using the full NA48/2 dataset of more than 5000
@@ Line 72: / Line 71: @@
 Measurement of the radiative Decay K+- -> pi0 e+- nu_e gamma (Ke3gamma)
-=======================================================================
 We report on the measurement of more than 200000 events of the decay K+-
 -> pi0 e+- nu_e gamma, recorded with the NA48/2 detector at CERN.

← Older revision		Revision as of 21:23, 10 February 2010
Line 2:		Line 2:
	== Abstracts 2010 ==		== Abstracts 2010 ==

		+	--------------------------------------------------
		+	Measurement of BR(K --> e nu)/BR(K --> mu nu)
		+	=====================================
		+	Measurement of the helicity suppressed ratio of charged kaon leptonic decay
		+	rates BR(K --> e nu)/BR(K --> mu nu) has long been considered as an
		+	excellent test of lepton universality and the Standard Model (SM)
		+	description of weak interactions. It was realised recently that the
		+	suppression of the SM contribution might enhance the sensitivity to
		+	SUSY-induced effects to an experimentally accessible level. The NA62
		+	experiment at the CERN SPS has collected a record number of over 105
		+	K --> e nu decays during a dedicated run in 2007, aiming at achieving 0.5%
		+	precision. Experimental strategy, details of the analysis and preliminary
		+	results are discussed.

		+	Measurement of the FCNC Decays K+- -> pi+- l+ l-
		+	================================================
		+	We report on measurements of the rare decays K+- -> pi+- e+ e- and K+-
		+	-> pi+- mu+ mu-. The full NA48/2 data set was analyzed, leading to more
		+	than 7200 reconstructed events in the electronic and more than 3000
		+	events in the muonic channel, the latter exceeding the total existing
		+	statistics by a factor of five. For both channels the selected events
		+	are almost background-free.
		+	From these events, we have determined the branching fraction and form
		+	factors of K+- -> pi+- e+ e- using different theoretical models. Our
		+	results improve the existing world averages significantly. In addition,
		+	we measured the CP violating asymmetry between K+ and K- in
		+	this channel to be less than a few percent.

		+	Measurement of Ks --> pipiee decay mode
		+	==================================
		+	The Ks to pipiee decay mode has been investigated using the data collected
		+	in 2002 by the NA48/1 collaboration. With about 23k signal events and 59k
		+	KL to pi+ pi- pi0D normalization decays, the ks to pipiee branching ratio was determined
		+	with respect to the KL one. This result is also used to set an upper limit on the presence
		+	of E1 direct emission in the decay amplitude. The CP-violating asymmetry has been
		+	also measured.
		+
		+	Precision Measurement of pi pi Scattering Lengths in Ke4 Decays
		+	===============================================================
		+	The measurement of the S-wave pi pi scattering lengths is a fundamental
		+	test of the validity of Chiral Perturbation Theory. We report on the
		+	final NA48/2 result, which uses the complete NA48/2 data set with more
		+	than a million reconstructed K+-e4 decays. From these events we have
		+	determined the decay form factors and pi pi scattering lengths a0_0 and
		+	a2_0. The result is the most precise measurement of the scattering lengths
		+	and in excellent agreement with the prediction of Chiral Perturbation
		+	Theory.
		+
		+	Precision Measurement of Photon Emission in K+- -> pi+- pi0 gamma Decays
		+	========================================================================
		+	We report our final result on the measurement of direct photon emission
		+	(DE) in the decay K+- -> pi+- pi0 gamma and its interference (INT) with
		+	the inner bremsstrahlung amplitude. For this measurement the full NA48/2
		+	data set with about 600k reconstructed K+- -> pi+- pi0 gamma decays was
		+	analyzed, which is factor of 30 larger than for previous experiments and
		+	a factor of three w.r.t. our preliminary result.
		+	From this, the sizes of both the DE and the INT amplitudes have been
		+	measured with high precision, with the INT amplitude being observed for
		+	the first time. In addition, the CP violating asymmetry between K+ and K- has been
		+	obtained to be less than 103 in this channel.
		+
		+	Measurement of the rare Decay K+- -> pi+- gamma gamma
		+	=====================================================
		+	We report on the measurement of the branching fraction of the rare decay
		+	K+- -> pi+- gamma gamma using the full NA48/2 dataset of more than 5000
		+	reconstructed decays from the full NA48/2 data set.
		+	From the spectrum of the invariant gamma gamma mass, the decay
		+	parameter c^ can be extracted with unprecedented precision.
		+
		+	Measurement of the radiative Decay K+- -> pi0 e+- nu_e gamma (Ke3gamma)
		+	=======================================================================
		+	We report on the measurement of more than 200000 events of the decay K+-
		+	-> pi0 e+- nu_e gamma, recorded with the NA48/2 detector at CERN.
		+	These statistics, about two orders of magnitude more than previous
		+	experiments, allow measurements of the decay rate and of possible CP
		+	violation in this decay with per cent precision.
		+
		+
		+
		+
		+
		+	== Abstracts 2009 ==

−	~~Abstracts 2009~~

	'''Excited QCD'''		'''Excited QCD'''

← Older revision		Revision as of 21:22, 10 February 2010
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−	'Abstracts 2010'	+
		+	== Abstracts 2010 ==
		+

← Older revision		Revision as of 21:21, 10 February 2010
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		+	Abstracts 2010
		+
		+
		+
		+	Abstracts 2009
		+
	'''Excited QCD'''		'''Excited QCD'''

← Older revision		Revision as of 11:33, 23 April 2009
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	'''CIPANP'''		'''CIPANP'''
		+
		+	[http://www.pi.infn.it/~fantechi/Conferences/2009/QCD_ke4.doc QCD Tests with Kaon Decays]
		+
		+	[http://www.pi.infn.it/~fantechi/Conferences/2009/ke2_NA62.doc Search of New Physics with Kaon decays at NA62]
		+
		+
		+	'''Blois'''
		+
		+	[http://www.pi.infn.it/~fantechi/Conferences/2009/QCD_ke4.doc QCD Tests with Kaon Decays]
		+
		+	[http://www.pi.infn.it/~fantechi/Conferences/2009/ke2_NA62.doc Search of New Physics with Kaon decays at NA62]
		+
		+
		+	'''PASCOS2009'''

	[http://www.pi.infn.it/~fantechi/Conferences/2009/QCD_ke4.doc QCD Tests with Kaon Decays]		[http://www.pi.infn.it/~fantechi/Conferences/2009/QCD_ke4.doc QCD Tests with Kaon Decays]